close

Вход

Забыли?

вход по аккаунту

JP2011147140

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2011147140
The present invention provides a portable terminal device capable of comfortable and highquality sound reproduction and having high adaptability to a use environment and high
convenience. SOLUTION: In a sound reproduction system of a portable terminal device, at least
two acoustic speakers 2a and 2b are provided in the portable terminal device, and the at least
two acoustic speakers are provided at both ends in the longitudinal direction or diagonal of the
portable terminal device. Located, at least one of the at least two acoustic speakers can be angled
with the casing wall of the portable terminal device along the direction of acoustic propagation to
the listener, or for at least two acoustic speakers At least one of the speakers may be angled
outward with respect to the other sound speakers to prevent crosstalk. [Selected figure] Figure 1
Sound reproduction system and method of portable terminal device
[0001]
The present invention relates to a portable terminal device including a wireless telephone, such
as a portable telephone, a personal handy phone system (PHS), a cordless telephone, a slave unit
of a parent-child telephone, and a personal digital assistant (PDA). In particular, the present
invention relates to a sound reproduction system and method of a portable terminal device for
realizing high-quality sound reproduction.
[0002]
03-05-2019
1
As for the installation of speakers in a portable terminal device such as a conventional portable
telephone, a ringer that generates a bell sound and a micromotor or the like for a vibrator that
causes vibration are attached to the casing of the portable terminal device as means for notifying
an incoming call. ing. Further, in order to perform reproduction of a received sound, which is a
basic function of a portable terminal device, and voice amplification such as an absence
recording, generally, microspeakers are attached and microphones are attached to collect voices.
[0003]
Patent Document 1 describes that, in a portable terminal device, listening to stereo sound using
earphones and headphones is described. In this case, if the earphones and headphones are used
for a long time, there is a pain in contact with the ear, there is the inconvenience of having to
carry along with the portable terminal when moving, and multiple people can not listen
simultaneously There was a problem that it was not enough in terms of comfort and convenience.
[0004]
Furthermore, Patent Document 2 discloses a personal computer (PC), a work station, and the like,
and Patent Document 3 discloses stereo sound reproduction using a speaker without an
earphone and a headphone in a notebook personal computer. In stereo sound reproduction of a
speaker, spatial spread of a sound source and crosstalk which will be described later, which is not
present in earphones and headphones, occur. For this reason, the space ¦ interval between right
and left speakers is ensured more than fixed distance, and the sound pressure difference between
both ears of a listener and phase difference are ensured more than fixed value with respect to
each left and right speaker. When the left and right speakers approach each other and the sound
pressure difference and phase difference between the listener's both ears decrease with respect
to the left and right speakers, the stereo effect disappears due to the crosstalk, and it approaches
monaural.
[0005]
By the way, since the portable terminal device is smaller than the above personal computer etc.,
naturally the distance between the left and right speakers is narrowed, and it is difficult to secure
the stereo effect, and high quality stereo reproduction is realized. Is a difficult problem. By the
03-05-2019
2
way, in recent years, with the mobile terminal device becoming more multimedia-oriented,
increasing the built-in memory capacity of the mobile terminal device, introducing a storage
medium, increasing the speed of communication, etc. It has come. Furthermore, the penetration
rate of portable terminal devices such as portable telephones is remarkable, and many people
carry it at the time of going out, so there is a problem that other added functions are added to
this to improve convenience.
[0006]
In order to view high-quality and comfortable sound provided by multimedia data using a
portable terminal device, the portable terminal device is not limited to stereo reproduction of
comfortable sound, but also to ensure high quality. There is a problem that it is required to
secure a wide frequency band. Furthermore, it is required that the portable terminal device
ensure the directivity of sound so as to be listened to by a plurality of people in a limited area, to
avoid inconvenience to the surroundings and to be suitable for the use environment. There is a
problem.
[0007]
Also, contrary to the above, there is a problem that it is required to secure the nondirectionality
of sound in order to listen to more people. Furthermore, there is a problem that the user needs to
be able to listen separately to two or more languages of sound sources.
[0008]
JP 10-276250 A JP 8-171 477 JP 9-120354 A
[0009]
Therefore, in view of the above problems and requirements, the present invention provides a
sound reproduction system and method of a portable terminal device capable of comfortable and
high-quality sound reproduction and having high adaptability to the use environment and high
convenience. The purpose is
[0010]
The present invention, in order to solve the above problems, in a sound reproduction system of a
03-05-2019
3
portable terminal device, the portable terminal device is provided with at least two acoustic
speakers, and the at least two acoustic speakers are of the portable terminal device. Located at
both ends in the longitudinal direction or diagonal, at least one of the at least two acoustic
speakers can be angularly changed with the housing wall of the portable terminal device so as to
be along the sound propagation direction to the listener Or a portable terminal device
characterized in that at least one of the at least two acoustic speakers can be angled outward
with respect to the other acoustic speakers so as to prevent crosstalk. To provide a sound
reproduction system.
[0011]
By this means, the portable terminal device can perform comfortable and high-quality sound
reproduction, and has high adaptability to the use environment and high convenience.
That is, when the portable terminal device is placed at a low place such as a desk or a floor, the
propagation direction of the sound from at least one of the at least two sound speakers is
directed to the listener and easy to hear.
[0012]
Furthermore, crosstalk between the sound speakers can be avoided at the time of stereo sound
reproduction, and high-quality stereo sound reproduction becomes possible in the portable
terminal device.
When the portable terminal device is miniaturized, crosstalk between the acoustic speakers can
be avoided by facing at least two of the acoustic speakers outward.
Furthermore, the angle of the acoustic speaker can be arbitrarily changed according to the
position of the listener with respect to the portable terminal device and the state of
miniaturization of the portable terminal device.
[0013]
03-05-2019
4
Preferably, a crosstalk prevention wall is provided between the at least two acoustic speakers, the
crosstalk prevention wall preventing crosstalk generated from the individual acoustic speakers.
By this means, crosstalk components that occur when at least two acoustic speakers come in
close proximity are physically eliminated. Preferably, said crosstalk prevention wall is foldable
and removable.
[0014]
By this means, the speaker for acoustics is unnecessary, and the crosstalk prevention wall is
prevented from being caught and damaged when the portable terminal device is carried.
Preferably, the portable terminal device is provided with a signal processing circuit for crosstalk
cancellation, and the signal processing circuit for crosstalk cancellation processes input signals to
the at least two acoustic speakers to eliminate crosstalk. By this means, it is possible to eliminate
crosstalk between acoustic speakers without the crosstalk prevention wall.
[0015]
Preferably, at least one of the at least two acoustic speakers is installed at a position recessed
from the housing wall position of the portable terminal device. By this means, it is possible to
realize a crosstalk prevention wall with reduced number of protruding portions to the outside
and less hooking as compared with the case where no recess is provided. Preferably, a part or all
of the at least one acoustic speaker is covered with a porous portion of a housing wall of the
portable terminal device or the housing wall covering the vibration surface of the speaker is
deleted.
[0016]
By this means, it is possible to improve the sound pressure of the sound from the speaker for
sound. Preferably, the at least one acoustic speaker is installed so as to protrude from the side
surfaces of both ends of the portable terminal device. By this means, the distance between the
sound speakers can be increased, crosstalk between the sound speakers can be reduced, and
high-quality stereo sound reproduction can be performed without the crosstalk prevention wall.
03-05-2019
5
[0017]
Preferably, at least one of the acoustic speakers is positioned from the front to the back of the
portable terminal device, and a part of the at least one acoustic speaker is covered by a porous
portion of a housing wall of the portable terminal device Alternatively, the housing wall covering
the vibration surface of the at least one acoustic speaker is deleted. By this means, the distance
between the sound speakers can be increased, crosstalk between the sound speakers can be
reduced, high-quality stereo sound reproduction becomes possible without a crosstalk prevention
wall, and the sound pressure of the sound speakers can be increased. It will be possible to
[0018]
Preferably, the protruding at least one acoustic speaker is accommodated in the portable
terminal device. By this means, since the acoustic speaker protruding when carrying the portable
terminal device is stored, it is possible to avoid an obstacle that may be caught when carrying.
Preferably, the at least two acoustic speakers are arranged in a row of loudspeaker arrays in the
mobile terminal device.
[0019]
By this means, the directivity in the direction of the speaker array is improved. Therefore, when a
small number of listeners listen to the sound at a place such as a coffee shop using the portable
terminal device, the sound reaches only the listener. The third party can be prevented from
reaching the sound, and the sound can be listened to without disturbing the surroundings
without using headphones or the like. Preferably, the at least two acoustic speakers are arranged
on the mobile terminal device in directions different from each other.
[0020]
By this means, it becomes possible to install the acoustic speakers outward from each other, so
the crosstalk of the sound of the acoustic speakers is reduced, and stereo sound reproduction
with higher sound quality can be realized. Furthermore, by installing the acoustic speakers
toward the four sides of the portable terminal device, the nondirectional effect can be further
improved. This is convenient when making a large number of listeners listen. Preferably, the at
03-05-2019
6
least two acoustic speakers perform sound reproduction so that different sounds are individually
heard in different directions.
[0021]
By this means, for example, sounds of two languages can be listened to by a plurality of people as
individually different sounds, and it becomes possible to listen to a plurality of languages
simultaneously with one portable terminal device 1. Preferably, the portable terminal device is
provided with a directional diaphragm signal processing circuit, and the directional diaphragm
signal processing circuit processes input signals to the at least two acoustic speakers to narrow
the direction of directivity.
[0022]
By this means, the directivity of sound propagation is narrowed in a fixed direction by signal
processing with a small number of sound speakers. Preferably, the portable terminal device is
provided with a nondirectional signal processing circuit, and the nondirectional signal processing
circuit processes input signals of the at least two acoustic speakers to make it nondirectional. By
this means, non-directionality in which sound propagation spreads more widely is realized with a
small number of sound speakers, so that a large number of listeners can be listened to without
adding sound speakers in a single portable terminal device. Makes it possible to listen to sound.
[0023]
Preferably, a directional diaphragm signal processing circuit for narrowing down the direction
regarding directivity of the at least two acoustic speakers to the portable terminal device, and a
nondirectional signal processing circuit for making the at least two acoustic speakers
nondirectional And the directional diaphragm signal processing circuit and the nondirectional
signal processing circuit are alternatively selected. By this means, the signal processing function
can be selected, so that it becomes possible to perform optimal signal processing depending on
the situation, and at the same time, comfortable acoustic listening can be performed at all times.
[0024]
03-05-2019
7
Preferably, the highly efficient at least two acoustic speakers are used to enable driving of the
unpress at the time of sound reproduction. By this means, by applying a highly efficient speaker
to an acoustic speaker, it becomes possible to drive an unpress, and by eliminating the need for
an amplifier, the number of parts of the portable terminal device is reduced, and a reduction in
size and weight is realized. Thus, the low power consumption can be realized, and the non-usable
time of the mobile terminal device in one charge can be increased.
[0025]
Preferably, individual sounds are reproduced from the at least two sound speakers, and the
volume of the individual sounds can be independently adjusted. By this means, for example, when
learning a foreign language while listening to two languages, learning efficiency can be improved
by listening with the volume of the native language reduced compared to foreign countries.
Preferably, the at least two acoustic speakers each have a characteristic specialized to the middle
to high range and a characteristic specialized to the low range.
[0026]
By this means, high-quality sound reproduction can be performed in a high band. Preferably, the
at least two acoustic speakers allow acoustic reflection to be used when the portable terminal
device is placed in contact with a surface including a desk, a floor, and a wall. By this means,
when the portable terminal comes in contact with a surface such as a desk, the bass component
is reflected by the surface such as the desk and the phase is reversed to be in phase with the bass
component coming out from the front of the acoustic speaker. It becomes possible to reinforce
the low frequency component which comes out of.
[0027]
Preferably, sound reproduction of the at least two sound speakers and a call of the portable
terminal device are simultaneously enabled. Furthermore, preferably, sound reproduction signals
of the at least two sound speakers are transmitted to be able to be heard by the other party of
the mobile terminal device. By these means, it is possible to realize conversation with BGM using
a portable terminal device.
03-05-2019
8
[0028]
Preferably, at least one of the at least two acoustic speakers is an acoustic speaker that is also
used as a call microphone, an acoustic speaker that is used as a reception speaker, an acoustic
speaker that is used as a ringer, an acoustic speaker that is also used as a vibrator, and a screen
display monitor. The device is also used as a device of the portable terminal device including the
speaker for sound and the speaker for sound used as a key panel.
[0029]
By this means, by sharing the speaker for sound and the device, the number of parts of the
portable terminal device can be reduced, and a reduction in size and weight can be realized.
Preferably, an acoustic signal generator is connected to the portable terminal device, the acoustic
signal generator has acoustic data, and the at least two acoustic speakers are configured to
acquire the acoustic data obtained from the acoustic signal generator. Play sound.
[0030]
This means enables the portable terminal device to function as an external audio speaker and
adds a function of reproducing the sound from another sound source, thereby enabling to cope
with more acoustic data and the portable terminal device Apart from this, it is not necessary to
carry an acoustic speaker separately. Preferably, a plurality of the acoustic signal generation
devices are connected to the portable terminal device, and the acoustic signal generation device
as an acquisition destination is switched by a switch.
[0031]
By this means, convenience can be improved, for example, sounds from a plurality of sound
sources can be easily compared. Preferably, the at least two acoustic speakers can be unpressdriven, and acoustic reproduction of the acoustic data obtained from the acoustic signal
generation device is enabled in a state where the portable terminal device itself is turned off.
03-05-2019
9
[0032]
By this means, in the case of reproducing an input signal from the outside, sound reproduction
can be performed in a state where the power of the portable terminal device itself is turned off.
As a result, the portable terminal device saves power, the usable time for one charge is increased,
and high-quality sound reproduction can be performed without being tied to the remaining
amount of the battery. Preferably, the portable terminal device wirelessly obtains data from the
acoustic signal generator. As this means, it is possible to apply bluetooth etc. and no cable is
required, so the system configuration can be simplified. Preferably, headphones or earphones are
connected to the portable terminal device, and reproduced sound is heard from the headphones
or earphones instead of the at least two acoustic speakers.
[0033]
Furthermore, preferably, the reproduction sound from the at least two sound speakers from the
headphone or the earphone and the call sound of the portable terminal device are simultaneously
listened to. By these means, a conversation with comfortable BGM can be realized without much
trouble of the surroundings. In addition, it becomes possible to make the conversation more
bouncing by selecting the noise of the station, the crowd, the department store, the noise of the
tavern, etc. in BGM. Preferably, the mobile terminal device is stretchable, and more preferably,
the mobile terminal device is foldable.
[0034]
By these means, the present invention is similarly applicable to a stretchable and foldable
portable terminal device, and high-quality stereo sound reproduction is possible.
[0035]
Furthermore, according to the present invention, in the sound reproduction method of a portable
terminal device, at least two acoustic speakers provided in the portable terminal device are
located at both ends in the longitudinal direction or diagonal of the portable terminal device Of
the speakers, at least one of the acoustic speakers can be angle-changeable with the housing wall
of the portable terminal device along the sound propagation direction to the listener, or at least
one of the at least two acoustic speakers According to another aspect of the present invention,
there is provided a method of reproducing sound of a portable terminal device, wherein the
03-05-2019
10
sound speaker is capable of changing its angle outward with respect to another sound speaker so
as to prevent crosstalk.
By this means, as in the above invention, the portable terminal device can perform comfortable,
high-quality sound reproduction, and has high adaptability to the usage environment and high
convenience. That is, when the portable terminal device is placed at a low place such as a desk or
a floor, the propagation direction of the sound from at least one of the at least two sound
speakers is directed to the listener and is easy to hear. Furthermore, crosstalk between the sound
speakers can be avoided at the time of stereo sound reproduction, and high-quality stereo sound
reproduction becomes possible in the portable terminal device. When the portable terminal
device is miniaturized, crosstalk between the acoustic speakers can be avoided by facing at least
two of the acoustic speakers outward.
[0036]
Preferably, a crosstalk prevention wall provided between the at least two acoustic speakers
prevents crosstalk generated from the individual acoustic speakers. By this means, crosstalk
components that occur when at least two acoustic speakers come in close proximity are
physically eliminated.
[0037]
Further, according to the present invention, there is provided a portable terminal device
characterized in that at least two acoustic speakers provided in the portable terminal device are
simultaneously driven to assist each other in reproduction sound in the method of sound
reproduction of the portable terminal device. Provided is a method of sound reproduction. By this
means, as in the above invention, the portable terminal device can perform comfortable, highquality sound reproduction, and has high adaptability to the usage environment and high
convenience.
[0038]
As described above, according to the present invention, the portable terminal device is provided
with a plurality of acoustic speakers, and the at least two acoustic speakers are simultaneously
driven while assisting each other's reproduced sound, so that headphones, It has become possible
to realize comfortable and high-quality sound reproduction on its own, without using earphones
03-05-2019
11
and external speaker systems, and to realize portable terminals with high adaptability to the
usage environment and high convenience. .
[0039]
It is a figure which shows schematic structure which shows 1st Embodiment in the sound
reproduction system of the portable terminal device which concerns on this invention.
It is a figure explaining stereo sound reproduction ¦ regeneration of speaker 2a, 2b for sound of
FIG. It is a figure which shows schematic structure which shows 2nd Embodiment in the sound
reproduction system of the portable terminal device which concerns on this invention. It is a
figure which shows schematic structure which shows 3rd Embodiment in the sound reproduction
system of the portable terminal device which concerns on this invention. It is Ba-Ba 'or Bb-Bb'
sectional drawing in FIG. It is a figure which shows schematic structure which shows 4th
Embodiment in the sound reproduction system of the portable terminal device which concerns
on this invention. It is B-B 'sectional drawing in FIG. It is a figure explaining reduction of the
crosstalk of speaker 2a, 2b for sound in FIG. 6, FIG. It is a figure which shows schematic structure
which shows 5th Embodiment in the sound reproduction system of the portable terminal device
which concerns on this invention. It is a figure which shows schematic structure which shows 6th
Embodiment in the sound reproduction system of the portable terminal device which concerns
on this invention. It is a figure which shows schematic structure which shows 7th Embodiment in
the sound reproduction system of the portable terminal device which concerns on this invention.
It is the schematic block diagram which looked at the A-A 'cross section containing speaker 2a,
2b for sound in FIG. 11 from the arrow direction. It is a figure explaining reduction of the
crosstalk of speaker 2a, 2b for sound in FIG. 11, FIG. It is a figure which shows the 2nd
modification of schematic structure regarding 7th Embodiment in FIG. It is a figure which shows
the 3rd modification of schematic structure regarding 7th Embodiment in FIG. It is a figure which
shows schematic structure which shows 8th Embodiment in the sound reproduction system of
the portable terminal device which concerns on this invention. It is a figure which shows
schematic structure which shows 9th Embodiment in the sound reproduction system of the
portable terminal device which concerns on this invention. It is a figure which shows schematic
structure which shows 10th Embodiment in the sound reproduction system of the portable
terminal device which concerns on this invention. It is a figure which shows schematic structure
which shows 11th Embodiment in the sound reproduction system of the portable terminal device
which concerns on this invention. FIG. 21 is a schematic configuration view of the A-A ′ cross
section including the acoustic speakers 2 a and 2 b in FIG. 19 as viewed in the arrow direction. It
is a figure which shows the outline of the circuit which performs the signal processing of
crosstalk removal. FIG. 22 is a view for explaining the crosstalk deletion operation of FIG. 21; FIG.
03-05-2019
12
21 is a diagram showing a first modified example of the eleventh embodiment in FIG. 20. FIG. 21
is a view showing a second modification of the eleventh embodiment in FIG. 20. It is a figure
which shows schematic structure which shows 12th Embodiment in the sound reproduction
system of the portable terminal device which concerns on this invention.
It is the schematic block diagram which looked at the A-A 'cross section containing speaker 2a,
2b for sound in FIG. 25 from the arrow direction. It is a figure which shows schematic structure
which shows 13th Embodiment in the sound reproduction system of the portable terminal device
which concerns on this invention. It is a side view of the portable terminal device in FIG. It is a
figure which shows schematic structure which shows 14th Embodiment in the sound
reproduction system of the portable terminal device which concerns on this invention. It is a
figure which shows the directivity of the acoustic speaker array 2s of FIG. It is a figure which
shows schematic structure which shows 15th Embodiment in the sound reproduction system of
the portable terminal device which concerns on this invention. It is a figure showing a schematic
structure which shows a 16th embodiment in a sound reproduction system of a personal digital
assistant concerning the present invention. It is a figure explaining the example of a circuit of the
signal processing which narrows the directivity of speaker 2a, 2b for sound of FIG. FIG. 33 is a
first modification of the sixteenth embodiment shown in FIG. 32, and is a diagram for explaining
an example of signal processing for making directivity of the acoustic speakers 2a and 2b
nondirectional. It is a figure which shows schematic structure which shows 17th Embodiment in
the sound reproduction system of the portable terminal device which concerns on this invention.
It is a figure which shows schematic structure which shows 18th Embodiment in the sound
reproduction system of the portable terminal device which concerns on this invention. It is a
figure which shows the propagation direction of the sound of the portable terminal device 1 in
FIG. It is a figure showing the schematic structure which shows the nineteenth embodiment in
the sound reproduction system of the personal digital assistant concerning the present invention.
FIG. 39 is a diagram showing a first modified example of the nineteenth embodiment in FIG. 38.
FIG. 39 is a diagram showing a second modification of the nineteenth embodiment in FIG. 38.
FIG. 39 is a diagram showing a third modification of the nineteenth embodiment in FIG. 38. FIG.
39 is a diagram showing a fourth modified example related to the nineteenth embodiment in FIG.
38. FIG. 39 is a diagram showing a fifth modification of the nineteenth embodiment in FIG. 38.
FIG. 39 is a diagram showing a sixth modification of the nineteenth embodiment in FIG. 38. It is a
figure showing a schematic structure showing a twentieth embodiment in a sound reproduction
system of a portable terminal device according to the present invention. It is a figure showing the
schematic structure which shows the 21st embodiment in the sound reproduction system of the
portable terminal device concerning the present invention.
[0040]
03-05-2019
13
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a view showing a schematic configuration showing a first embodiment of a
sound reproduction system of a portable terminal device according to the present invention. As
shown in the figure, the mobile terminal device 1 includes a screen display monitor 11
configured of a liquid crystal (LCD) to display a menu, a telephone number, a function, etc., and a
menu selection operation. A key panel 12 for performing function selection operations, an
earpiece 13 for listening to the received voice from a speaker, a mouthpiece 14 for transmitting a
voice to be transmitted to a microphone, and a received signal converted into a received signal
And an antenna 15 for converting it into a transmission radio wave.
[0041]
Furthermore, the portable terminal device 1 is provided with sound speakers 2a and 2b for
performing stereo sound reproduction. The acoustic speakers 2a and 2b are located diagonally in
the longitudinal direction on the front surface of the portable terminal device 1, and are directed
to the front surface of the portable terminal device 1 to maximize the distance between the
acoustic speakers 2a and 2b. It is arranged as. FIG. 2 is a diagram for explaining stereophonic
sound reproduction of the acoustic speakers 2a and 2b of FIG. As shown in the figure, the left
(Left; L) and right (Right; R) signals are stereophonically reproduced by the acoustic speakers 2a
and 2b, and the stereophonically reproduced acoustic waves reach the listener.
[0042]
Such installation enables comfortable and high-quality sound reproduction of the sound speakers
2a and 2b. That is, as in the prior art, stereo sound reproduction can be performed only with the
portable terminal device 1 without using headphones, earphones, an external speaker system,
and the like. As a first modification of the first embodiment, when the portable terminal device 1
is installed in contact with a surface such as a desk, a floor or a wall, the rear surface of the
acoustic speakers 2a and 2b is released. Make acoustic reflections available.
[0043]
Since the portable terminal device 1 is small, it is difficult to reproduce bass. According to the
present invention, when the portable terminal device 1 is in contact with a surface such as a
03-05-2019
14
desk, the bass component is reflected by the surface such as the desk and the phase is reversed
to be in phase with the bass component coming out from the front of the acoustic speakers 2a
and 2b. It becomes possible to reinforce the low frequency component which comes out from the
front. When the portable terminal device 1 is not in contact with the surface of a desk or the like,
the backs of the acoustic speakers 2a and 2b are closed, and the bass component gets into the
front of the acoustic speakers 2a and 2b due to the diffraction effect. Do not reduce the sound
pressure of the components.
[0044]
As a second modification of the first embodiment, by applying a speaker with high efficiency to
the acoustic speakers 2a and 2b, a structure capable of driving the unpress is provided. As
described above, by eliminating the need for an amplifier, the number of parts of the portable
terminal device 1 can be reduced, size and weight reduction can be realized, low power
consumption can be realized, and the portable terminal device 1 can not be used in one charge.
Possible time increases.
[0045]
As a third modification of the first embodiment, the configuration is such that sound
reproduction and communication can be performed simultaneously. In addition, the sound
reproduction signal is transmitted to be able to be heard by the other party. This makes it
possible to realize conversations with BGM. As a fourth modification of the first embodiment,
individual sounds are reproduced from the sound speakers 2a and 2b, and the volume of each
sound can be adjusted independently.
[0046]
As a result, for example, when learning a foreign language while listening to two languages,
learning efficiency can be improved by listening with the volume of the native language reduced
compared to the foreign language. FIG. 3 is a view showing a schematic configuration showing a
second embodiment of the sound reproduction system of the portable terminal device according
to the present invention. As shown in this figure, compared with FIG. 1, the portable terminal
device 1 is stretchable, and the acoustic speakers 2a and 2b are located on the front of the
portable terminal device 1 diagonally in the longitudinal direction and at both ends. .
03-05-2019
15
[0047]
As shown in the figures (a) and (b), the distance between the acoustic speakers 2a and 2b is
increased by the extension of the flip portion of the portable terminal device 1, and the distance
between the acoustic speakers 2a and 2b is increased. The interval is maximized. Thereby, the
crosstalk in the sound speakers 2a and 2b is reduced. Since the present invention is applied to
the stretchable portable terminal device 1, it is possible to provide high-quality stereo sound
reproduction in addition to the convenience of carrying when moving.
[0048]
FIG. 4 is a view showing a schematic configuration showing a third embodiment of the sound
reproduction system of the portable terminal device according to the present invention. As
shown in this figure, compared to FIG. 1, the acoustic speakers 2a and 2b are located on the front
of the mobile terminal device 1 at both ends of the same side in the longitudinal direction, and
the spacing between the acoustic speakers 2a and 2b Are arranged to be the largest.
[0049]
In the portable terminal device 1, the acoustic speakers 2a and 2b are installed in the following
manner, assuming that the desk or floor is installed at a position lower than the listener's ears.
FIG. 5 is a cross-sectional view of Ba-Ba 'or Bb-Bb' in FIG. As shown in the figure, the acoustic
speakers 2a and 2b are installed at an angle with the housing wall of the portable terminal 1 at
the installation location, and the sound from the acoustic speakers 2a and 2b is at the position 5
of the listener. It reaches along the sound propagation direction 7.
[0050]
The angle between the sound speakers 2a and 2b and the housing wall and the mutual angle can
be freely changed. As described above, by directing the direction of the sound speakers 2a and
2b to the position of the listener, it is possible to realize sound that is easier to hear. FIG. 6 is a
view showing a schematic configuration showing a fourth embodiment of the sound reproduction
03-05-2019
16
system of the portable terminal device according to the present invention, and FIG. 7 is a crosssectional view taken along the line B-B 'in FIG.
[0051]
As shown in FIG. 6, the acoustic speakers 2a and 2b are the same as those in FIG. 2 in that they
are located on the front of the mobile terminal device 1 at both ends of the same side in the
longitudinal direction. As shown, the acoustic speakers 2a, 2b are installed outward from each
other. In addition, it is possible to change freely the angle which makes speaker 2a, 2b for sound
mutually outward.
[0052]
It is assumed that the miniaturization of the portable terminal device 1 progresses further, and
the distance between the acoustic speakers 2a and 2b becomes smaller. Along with this, crosstalk
increases between the acoustic speakers 2a and 2b and the stereo effect is lost. However, as
shown in FIG. 6, the acoustic speakers 2a and 2b are installed outward from each other. This
crosstalk is reduced as described below.
[0053]
FIG. 8 is a view for explaining the reduction of crosstalk of the acoustic speakers 2a and 2b in
FIGS. In the case of FIG. 6A, the acoustic speakers 2a and 2b face in the same direction with
respect to the listener. The propagation direction 7a of the sound from the acoustic speaker 2a
consists of the propagation direction 7aL toward the left ear of the listener and the propagation
direction 7aR toward the right ear as crosstalk (dotted line), and the propagation direction of the
sound from the acoustic speaker 2b 7b consists of a propagation direction 7bL towards the left
ear of the listener as crosstalk (dotted line) and a propagation direction 7aR towards the right
ear.
[0054]
In headphones and earphones, such crosstalk does not exist because sound does not propagate in
03-05-2019
17
space. If the distance between the acoustic speakers 2a and 2b is equal to or greater than a
predetermined distance, the sound formed by the acoustic speakers 2a and 2b in the propagation
directions 7aL and 7aR and the acoustics in the propagation directions 7bR and 7bL respectively
Since the pressure difference and the phase difference are large and their polarities are opposite
to each other, the sound sources formed by the sound speakers 2a and 2b are identified.
[0055]
However, when the acoustic speakers 2a and 2b approach, the sound pressure difference and the
phase difference formed by the sound waves from the acoustic speakers 2a and 2b respectively
on the listener's ears are small, the propagation direction 7bR to the listener's right ear And 7aR,
7aL and 7bL reach the left ear, so the stereo effect is lost and only a monaural effect is obtained.
As shown in FIG. 6B, when the sound speakers 2a and 2b are installed outward from each other,
the sound in the propagation direction 7aR from the sound speaker 2a toward the right ear of
the listener does not reach the right ear, Furthermore, the rate at which the sound in the
propagation direction 7bL from the acoustic speaker 2b toward the left ear of the listener does
not reach the left ear increases, and the crosstalk is reduced.
[0056]
Since this crosstalk is reduced, the sound from the acoustic speaker 2b reaches the right ear of
the listener, and the ratio of the sound from the acoustic speaker 2a reaches the left ear of the
listener increases. Therefore, the listener can identify the sound sources of the acoustic speakers
2a and 2b, respectively. Therefore, even if the distance between the acoustic speakers 2a and 2b
decreases, the stereo effect similar to that of the headphones and the earphones can be obtained.
It is possible to get
[0057]
FIG. 9 is a view showing a schematic configuration showing a fifth embodiment of the sound
reproduction system of the portable terminal device according to the present invention. As
shown in this figure, compared to FIG. 1, the acoustic speaker 2a is a speaker disposed on the left
side as viewed from the front, top and front of the portable terminal device 1, and the acoustic
speaker 2b is It is a speaker placed over the left side as viewed from the front, the bottom and
the front of the portable terminal device 1.
03-05-2019
18
[0058]
In the present invention, as described in FIG. 7 and FIG. 8, in addition to high-quality stereo
sound reproduction by the effect of crosstalk reduction, as described in FIG. Since the sound
propagation direction of the sound speakers 2a and 2b is directed to the listener in a state of
being installed at a position lower than the ear, it becomes easier to listen to the sound. FIG. 10 is
a view showing a schematic configuration showing a sixth embodiment of the sound
reproduction system of the portable terminal device according to the present invention.
[0059]
As shown in this figure, compared with FIG. 1, the portable terminal device 1 is foldable, and the
acoustic speaker 2a is installed on the left side as viewed from the front, the top, and the front of
the portable terminal 1. It is a speaker, The speaker 2b for sound is a speaker installed over the
left side seen from the front of the portable terminal device 1, the lower surface, and the front.
Since the present invention is applied to the foldable portable terminal device 1 as compared
with the example shown in FIG. 9, it is possible to provide high-quality stereo sound reproduction
in addition to the convenience of carrying when moving. It will be possible.
[0060]
Next, although it is desirable that the distance between the acoustic speakers be large, in the
portable terminal device 1 in which the size and weight reduction is progressing, the size of the
portable terminal device 1 and the distance between individual acoustic speakers due to the
arrangement of other components The dimensions are naturally limited. Such a case will be
described below. FIG. 11 is a view showing a schematic configuration showing a seventh
embodiment of the sound reproduction system of a portable terminal device according to the
present invention, and FIG. 12 is a cross section along AA 'including the sound speakers 2a and
2b in FIG. Is a schematic configuration view when viewed from the direction of the arrow.
[0061]
03-05-2019
19
As shown in this figure, in comparison with FIG. 1, the acoustic speakers 2a and 2b are such that
the surfaces of the acoustic speakers 2a and 2b coincide with the front surface of the portable
terminal device 1, It is located between the screen display monitor 11 and the key panel 12
toward the front of the mobile terminal device 1 side by side in the direction. A crosstalk
prevention wall 8 is provided between the acoustic speakers 2a and 2b, and the crosstalk
prevention wall 8 is a wall protruding outward from the surface of the acoustic speakers 2a and
2b, and the acoustic speakers 2a and 2b are provided. When installed close to each other,
crosstalk generated between the acoustic speakers 2a and 2b is reduced as described below to
realize high-quality stereo sound reproduction.
[0062]
FIG. 13 is a view for explaining the reduction of crosstalk of the acoustic speakers 2a and 2b in
FIGS. In the figure (a), as described in FIG. 7, crosstalk occurs between the acoustic speakers 2a
and 2b. As shown in FIG. 6B, the crosstalk prevention wall 8 physically shields the crosstalk 7aL
and 7bR between the acoustic speakers 2a and 2b and does not reach the left and right ears of
the listener, respectively. Therefore, it is possible to realize high-quality stereo sound
reproduction.
[0063]
In addition, since the crosstalk prevention wall 8 protrudes from the portable terminal device 1,
it may become an obstacle such as being caught when moving the portable terminal device 1.
Therefore, as a first modification of the seventh embodiment according to the present invention,
the crosstalk prevention wall 8 has a movable structure such as folding or removing when it is
not necessary to use and listens to the sound. It is set as the structure set to the portable terminal
device 1 only when.
[0064]
As a result, it does not become an obstacle such as breakage at the time of carrying, and stereo
sound reproduction with high sound quality becomes possible at the time of sound listening. The
crosstalk prevention wall 8 can have a structure in which the length is extended in the vertical
direction in FIG. When the cross talk prevention wall 8 is short in the vertical direction, cross talk
is avoided at the part where the prevention wall is located, but at a position where the prevention
03-05-2019
20
wall is interrupted, a factor of crosstalk occurs. However, the crosstalk can be further reduced by
lengthening the crosstalk prevention wall 8 in the vertical direction. Further, by providing the
storage space for the crosstalk prevention wall 8 in the portable terminal device 1 and
accommodating the removed crosstalk prevention wall 8, it is possible to avoid the loss of the
crosstalk prevention wall 8.
[0065]
FIG. 14 is a view showing a second modified example of the schematic configuration relating to
the seventh embodiment in FIG. As shown in the figure, in the configuration in the cross section
corresponding to AA 'in FIG. 11, the acoustic speakers 2a and 2b are installed at a position
recessed from the housing wall position 6 of the portable terminal device 1, It is divided at the
boundary 8 'between the speakers 2a and 2b.
[0066]
This boundary 8 'brings about an effect similar to the crosstalk prevention wall 8 provided in the
embodiment of FIGS. 11 and 12, so that the crosstalk prevention wall which does not protrude to
the outside can be realized, and at the time of sound listening It makes it possible to realize highquality stereo sound reproduction. FIG. 15 is a view showing a third modification of the
schematic configuration relating to the seventh embodiment in FIG.
[0067]
As shown in the figure, the acoustic speakers 2 a and 2 b are installed at positions recessed from
the housing wall position 6 of the portable terminal device 1. The crosstalk prevention wall 8
prevents acoustic crosstalk between the acoustic speakers 2a and 2b. Generally, the higher the
height of the crosstalk prevention wall 8, the higher its effect. However, if the crosstalk
prevention wall 8 protrudes from the housing wall position 6 of the portable terminal device 1, it
may become an obstacle.
[0068]
03-05-2019
21
For this reason, since the crosstalk prevention wall 8 is provided to the sound speakers 2a and
2b in a state of being installed in a recessed manner as described above, the amount of
protrusion is reduced by the depth of the recess. A speaker 2a, 2b is installed close to the
housing wall position 6 of the portable terminal device 1, and the crosstalk prevention wall 8 in
which the projecting part to the outside is reduced as compared with the case (FIG. 12) without
providing a recess (FIG. 12). Can be realized. At the time of sound listening, high-quality stereo
sound reproduction becomes possible.
[0069]
FIG. 16 is a view showing a schematic configuration showing an eighth embodiment of the sound
reproduction system of the portable terminal device according to the present invention. As
shown in this figure, compared to FIG. 1, the acoustic speaker 2a is installed on the front side of
the portable terminal 1 with the acoustic speaker 2a protruding from the side to the left as
viewed from the front of the portable terminal 1. The speaker 2 b protrudes from the side to the
right when viewed from the front of the mobile terminal device 1 and is installed toward the
front side of the mobile terminal 1.
[0070]
The acoustic speakers 2a and 2b are installed at an angle close to 90 degrees with the casing
wall of the portable terminal device 1 at the installation position. Thus, the distance between the
acoustic speakers 2a and 2b is the sixth embodiment of the present invention described in FIG.
11 by projecting the acoustic speakers 2a and 2b on the side surface of the portable terminal
device 1 and installing them. As a result, crosstalk occurring from the acoustic speakers 2a and
2b without the crosstalk prevention wall 8 can be reduced. Therefore, the number of parts can be
reduced and high-quality stereo sound reproduction can be realized.
[0071]
Further, by setting the acoustic speakers 2a and 2b from the front to the back of the portable
terminal device 1 and further deeply, the portable terminal device 1 itself is like the crosstalk
prevention wall of the acoustic speakers 2a and 2b. By performing this role, crosstalk of the
sound generated from the sound speakers 2a and 2b can be further reduced, and high-quality
stereo sound reproduction can be realized. As described above, the angle between the acoustic
03-05-2019
22
speakers 2a and 2b and the housing wall can be freely changed. Further, when the sound
speakers 2a and 2b protrude from the portable terminal device 1, there is a possibility that they
may be an obstacle at the time of carrying such as carrying around. Therefore, as a modification
of the eighth embodiment, the acoustic speakers 2a and 2b can be accommodated in the casing
of the portable terminal device 1, and the acoustic speakers 2a and 2b can be pulled out from the
casing when used. This makes it possible to prevent the acoustic speakers 2a and 2b from
becoming an obstacle at the time of carrying.
[0072]
FIG. 17 is a view showing a schematic configuration showing a ninth embodiment of the sound
reproduction system of the portable terminal device according to the present invention. As
shown in the figure, compared to FIG. 11, the acoustic speaker 2a is installed on the front side of
the portable terminal 1 with the acoustic speaker 2a protruding from the side to the left when
viewed from the front of the portable terminal 1 The speaker 2 b protrudes from the side to the
right when viewed from the front of the mobile terminal device 1 and is installed toward the
front side of the mobile terminal device 1. Furthermore, the acoustic speakers 2 a and 2 b are
installed at a depth slightly away from the front of the portable terminal device 1. From the
seventh embodiment of the present invention described with reference to FIG. 16, acoustical
speakers 2a and 2b are further acoustically removed by removing a housing wall at a position
blocking the acoustic speakers 2a and 2b. The vibration plane of the speaker 2a, 2b is not
covered by the housing wall. Therefore, the sound from the front of the acoustic speakers 2a and
2b reaches the listener, and the sound pressure can be further improved.
[0073]
Since the acoustic speakers 2a and 2b are not projected from the front of the portable terminal
device 1, the main body of the portable terminal device 1 between the acoustic speakers 2a and
2b serves as a cross talk prevention wall between both speakers, and stereo of higher sound
quality Sound reproduction becomes possible. Note that, as described above, when the sound
speakers 2a and 2b protrude from the portable terminal device 1, there is a possibility that they
may be an obstacle at the time of carrying, such as carrying around. Therefore, as a modification
of the ninth embodiment, the acoustic speakers 2a and 2b can be accommodated in the housing
of the portable terminal device 1, and when the acoustic speakers 2a and 2b are used, they are
pulled out from the housing. This makes it possible to prevent the acoustic speakers 2a and 2b
from becoming an obstacle at the time of carrying.
03-05-2019
23
[0074]
FIG. 18 is a view showing a schematic configuration showing a tenth embodiment of a sound
reproduction system of a portable terminal device according to the present invention. As shown
in this figure, compared to FIG. 11, the acoustic speaker 2 a is installed on the left side as viewed
from the front and the front of the portable terminal device 1, and the acoustic speaker 2 b is
installed in the portable terminal device 1. It is installed on the right side when viewed from the
front and the front.
[0075]
In the present invention, since the acoustic speakers 2a and 2b are not protruded from the
housing wall in comparison with FIG. 16, the acoustic speakers 2a and 2b are not obstructed, and
the acoustic speakers 2a and 2b are hooked when moving It can be avoided from the situation.
Furthermore, by providing the acoustic speakers 2a and 2b outward, the crosstalk of the sound
of the acoustic speakers 2a and 2b is reduced, and stereo sound reproduction with higher sound
quality can be realized.
[0076]
FIG. 19 is a view showing a schematic configuration showing an eleventh embodiment of a sound
reproduction system of a portable terminal device according to the present invention, and FIG.
20 is a cross section along AA 'including sound speakers 2a and 2b in FIG. Is a schematic
configuration view when viewed from the direction of the arrow. As shown in this figure, in
comparison with FIG. 1, the acoustic speakers 2a and 2b are such that the surfaces of the
acoustic speakers 2a and 2b coincide with the front surface of the portable terminal device 1, It
is located between the screen display monitor 11 and the key panel 12 side by side in the
direction.
[0077]
In addition, since the crosstalk prevention wall 8 of FIG. 11 is not provided, signal processing for
deleting the following crosstalk is performed instead of the crosstalk prevention wall 8. FIG. 21 is
03-05-2019
24
a schematic diagram of a circuit that performs signal processing for crosstalk cancellation. As
shown in the figure, inverse filters 20a and 20b are provided to respectively input branched
signals of left (L) and right (R) signals to the acoustic speakers 2a and 2b.
[0078]
The inverse filters 20a and 20b invert the phase of the input branched signal. Adders 21a and
21b are provided between the branch points of the left (L) and right (R) signals and the acoustic
speakers 2a and 2b, respectively. The adders 21a and 21b respectively add the right (R) and left
(L) signals and the output signals of the inverse filters 20a and 20b, and output the result to the
acoustic speakers 2a and 2b.
[0079]
FIG. 22 is a view for explaining the crosstalk elimination operation of FIG. As shown in the figure
(a), the propagation directions 7a and 7b of the sound from the acoustic speakers 2a and 2b to
the listener include 7aR and 7bL as crosstalk as described above. As shown in this figure (b), due
to the signal processing of crosstalk, the acoustics in the propagation directions 7aR and 7bL as
crosstalk are canceled out by the phase-inverted sound and eliminated without using the
aforementioned crosstalk prevention wall 8 Ru.
[0080]
FIG. 23 shows a first modification of the eleventh embodiment shown in FIG. As shown in the
figure, the acoustic speakers 2 a and 2 b are installed at a position recessed from the housing
wall 6 of the portable terminal device 1. As a result, by forming a key panel or the like on a part
or the whole of the casing wall 6 of the portable terminal device 1 with respect to the installation
surface of the acoustic speakers 2a and 2b, efficient component arrangement in the portable
terminal device 1 is achieved. It will be possible.
[0081]
FIG. 24 shows a second modification of the eleventh embodiment shown in FIG. As shown in the
03-05-2019
25
figure, by partially projecting the acoustic speakers 2a and 2b from the casing of the portable
terminal device 1, the internal space of the casing corresponding to the projecting portion is
saved, and for this portion, Parts can be arranged, the entire case can be made smaller, and the
like, and a smaller and lighter mobile terminal device 1 can be realized.
[0082]
FIG. 25 is a diagram showing a schematic configuration showing a twelfth embodiment of a
sound reproduction system of a portable terminal device according to the present invention, and
FIG. 26 is an AA 'cross section including the sound speakers 2a and 2b in FIG. Is a schematic
configuration view when viewed from the direction of the arrow. As shown in this figure,
compared to FIG. 19, the acoustic speakers 2 a and 2 b are provided on the key panel 12 so as to
be recessed inside the housing of the portable terminal device 1. In this way, by making the area
occupancy of the acoustic speaker relative to the portable terminal case wall smaller, the
portable terminal case wall can be used for other applications such as a key panel, and the
portable terminal device can be miniaturized. Can be realized.
[0083]
Furthermore, since the acoustic speakers 2a and 2b are covered by the porous portion 6 'of the
housing wall, the sound is transmitted to the outside of the housing through the porous portion
6' of the housing wall, and a sufficient sound pressure can be obtained. . The signal processing
circuit of FIG. 21 eliminates the crosstalk of the acoustic speakers 2a and 2b. Thus, when
listening to sound, it is possible to realize high-quality stereo sound reproduction with a sufficient
sound pressure.
[0084]
FIG. 27 is a view showing a schematic configuration showing a thirteenth embodiment of a sound
reproduction system of a portable terminal device according to the present invention, and FIG.
28 is a side view of the portable terminal device in FIG. As shown in this figure, compared to FIG.
2, the acoustic speakers 2a and 2b are located at both ends of the same side in the longitudinal
direction toward the front of the portable terminal device 1, and the acoustic speaker 2c is
portable. It is located in the longitudinal center towards the back of the terminal device 1. That is,
the acoustic speaker 2c is arranged to have an orientation of 180 degrees with respect to the
03-05-2019
26
acoustic speakers 2a and 2b.
[0085]
The sound speakers 2a and 2b are given characteristics specific to the medium to high range,
and the sound speaker 2c is given characteristics specific to the low range, and by operating like
a woofer, it is possible to obtain more broadband It enables high-quality sound reproduction.
Furthermore, as a modification of the twelfth embodiment of the present invention, the directions
of the acoustic speakers 2a, 2b and 2c are made movable.
[0086]
For example, when the portable terminal device 1 is placed at a low position, the acoustic
speakers 2a, 2b, and 2c are set upward, and when it is desired to obtain wide area sound such as
listening by a large number of people As described above, it becomes possible to select the
optimal speaker direction depending on the case, and the versatility can be further improved.
FIG. 29 is a view showing a schematic configuration showing a fourteenth embodiment of a
sound reproduction system of a portable terminal device according to the present invention.
[0087]
As shown in the figure, the portable terminal device 1 is provided with an acoustic speaker array
2s, and the acoustic speaker array 2s is arranged in a row in the longitudinal direction of the
portable terminal device 1 toward the back of the portable terminal device 1 Is an array of
acoustic speakers. FIG. 30 is a diagram showing the directivity of the acoustic speaker array 2s of
FIG. As shown in the figure, the directivity is improved in the direction of the acoustic speaker
array 2s. When a small number of listeners listen to the sound at a place such as a coffee shop
using the portable terminal device 1, the sound reaches only the listener and the sound does not
reach the third person This makes it possible to listen to sound without annoying the
surroundings without using headphones and the like.
[0088]
03-05-2019
27
FIG. 31 is a view showing a schematic configuration showing a fifteenth embodiment of a sound
reproduction system of a portable terminal device according to the present invention. As shown
in this figure, sound speakers 2a, 2b, 2c and 2d are provided around the portable terminal device
1 as compared with FIG. As described above, by arranging the sound speakers 2a, 2b, 2c, and 2d
in four directions, it is possible to further improve the effect of nondirectionality. This is
convenient when making a large number of listeners listen.
[0089]
Next, an example in which the directivity of sound propagation is narrowed in a certain direction
without increasing the number of sound speakers, and an example in which the directivity of
sound propagation is expanded to a wider angle will be described. FIG. 32 is a diagram showing a
schematic configuration showing a sixteenth embodiment of a sound reproduction system of a
portable terminal device according to the present invention. As shown in this figure, only two
acoustic speakers 2 a and 2 b are provided at both ends in the longitudinal direction of the
mobile terminal device 1 toward the back of the mobile terminal device 1 as compared to FIG.
The directivity of acoustic propagation of the acoustic speakers 2a and 2b is narrowed in a fixed
direction by signal processing as follows.
[0090]
FIG. 33 is a diagram for explaining a circuit example of signal processing for reducing the
directivity of the acoustic speakers 2a and 2b of FIG. As shown in FIG. 6A, for example, of the
sound speakers 2a and 2b, the delay device 22 is provided on the input side of the sound speaker
2b. When the delay unit 22 is not provided, it is assumed that the directivity is narrowed in the
sound propagation direction indicated by the dotted line of the sound speakers 2a and 2b.
[0091]
When the delay unit 22 is provided, the right (R) signal is delayed relative to the left (L) signal,
and the directivity of the sound formed by the sound speakers 2a and 2b is as shown in this
figure (a). The direction is narrowed when there is a delay from when there is no delay. By setting
an arbitrary delay amount, it is possible to arbitrarily narrow the directionality of the sound.
03-05-2019
28
[0092]
As shown in FIG. 6B, for example, the attenuator 23 is provided on the input side of the acoustic
speaker 2b among the acoustic speakers 2a and 2b. When the attenuator 23 is not provided, it is
assumed that the directivity is narrowed in the direction of sound propagation indicated by the
dotted line of the sound speakers 2a and 2b. The right (R) signal becomes smaller in amplitude
than the left (L) signal by the attenuator 22, and the directivity of the sound formed by the
acoustic speakers 2a and 2b is not attenuated as shown in FIG. Direction is narrowed when there
is attenuation from the case.
[0093]
By setting an arbitrary attenuation amount, it is possible to narrow the directionality of the sound
directivity arbitrarily. In this way, the directivity is narrowed in a certain direction, so that when a
small number of people listen to the sound at a place such as a coffee shop, the sound reaches
only the listener and does not reach the third person By doing this, it becomes possible to listen
to the sound without the nuisance to the surroundings without using headphones, earphones, etc.
with a small number of sound speakers.
[0094]
FIG. 34 is a first modification of the sixteenth embodiment shown in FIG. 32, and is a diagram for
explaining a circuit example of signal processing for making directivity of the acoustic speakers
2a and 2b nondirectional. As shown in the figure, a delay unit 24a that branches and delays the
left (L) signal to the input side of the acoustic speaker 2a, and the signal delayed by the delay
unit 24a is added to the original left (L) signal. Then, an adder 25a is provided to output to the
acoustic speaker 2a.
[0095]
Furthermore, a delay unit 24b for branching and delaying the right (R) signal to the input side of
the acoustic speaker 2b, and a signal delayed by the delay unit 24b are added to the original
right (R) signal to obtain an acoustic speaker. An adder 25b that outputs 2b is provided. The
direction of the sound propagation from the sound speakers 2a and 2b by the left (L) signal and
03-05-2019
29
the right (R) signal with no delay in both directions is the (a) direction as shown in the figure.
[0096]
Due to the delayed right (R) signal and the delayed left (L) signal, the direction of acoustic
propagation from the acoustic speakers 2a and 2b is as shown in FIG. The direction of sound
propagation from the sound speakers 2a and 2b is the direction (c) as shown in the figure due to
the right (R) signal without delay and the left (L) signal with delay. The directions of sound
propagation from the acoustic speakers 2a and 2b due to the delayed right (R) signal and the
delayed left (L) signal are as shown in this figure when both delay amounts are equal. a) Match
the direction.
[0097]
As described above, when the speaker for sound is placed only on one side of the portable
terminal device 1 when the user makes a ring around the portable terminal device 1 to listen to
the sound, the acoustic speaker is not installed. On the other hand, it is expected that it will be
difficult to listen to the sound, but the signal processing of the present invention realizes nondirectionality in which the sound propagation spreads in a wider angle, so that the sound in one
mobile terminal device 1 is realized. A large number of listeners can listen to the sound without
adding speakers.
[0098]
Although one delay unit is provided on each of the input sides of the sound speakers 2a and 2b,
the present invention is not limited to this, and a plurality of delay units having different delay
amounts may be provided.
Thereby, smooth nondirectionality can be realized. Also, by increasing the number of speakers, it
is possible to listen to a wider range of sounds. Next, since the number of listeners and the
location change depending on the time and circumstances, it may cause inconvenience if the
signal processing function is single, so the avoidance of this inconvenience will be described
below.
[0099]
03-05-2019
30
FIG. 35 is a diagram showing a schematic configuration showing a seventeenth embodiment of a
sound reproduction system of a portable terminal device according to the present invention. As
shown in the figure, a directional diaphragm signal processing unit 31, a nondirectional signal
processing unit 32, and a switch unit 33 are provided on the input side of the acoustic speakers
2a and 2b. The directional diaphragm signal processing unit 31 has a configuration as shown in
FIG. 33, and performs signal processing for narrowing the directivity in a certain direction.
[0100]
The nondirectional signal processing unit 32 has a configuration as shown in FIG. 34 and
performs signal processing for forming nondirectionality. The switch unit 33 selects one of the
directional diaphragm signal processing unit 31 and the nondirectional signal processing unit 32.
Thus, since the signal processing function can be selected, it becomes possible to perform
optimum signal processing depending on the situation, and at the same time, comfortable
acoustic listening can be always performed.
[0101]
FIG. 36 is a diagram showing a schematic configuration showing an eighteenth embodiment of a
sound reproduction system of a portable terminal device according to the present invention. As
shown in this figure, compared to FIG. 1, the acoustic speakers 2a and 2b are disposed in the
lateral direction of the upper part of the portable terminal device 1, and the acoustic speaker 2a
faces the front of the portable terminal device 1 The speaker 2b is directed to the back of the
portable terminal device 1, and both have directions different by 180 degrees.
[0102]
FIG. 37 is a view showing the sound propagation direction of the portable terminal device 1 in
FIG. As shown in the figure, the sound listening positions 5a and 5b are the listening positions
from the sound speakers 2a and 2b, and the sound propagation directions 7a and 7b are the
sound propagation directions generated from the sound speakers 2a and 2b. Show. The sound
speakers 2a and 2b listen to individually different sounds, for example, bilingual sounds by a
plurality of people. For example, a person who wants to listen to the language from the acoustic
03-05-2019
31
speaker 2a can listen to the language from the acoustic speaker 2b at the acoustic listening
position 5a, and a person who wants to listen to the language from the acoustic speaker 2b at the
acoustic listening position 5b. It becomes possible to listen to a plurality of languages
simultaneously.
[0103]
Further, by installing the acoustic speakers 2a and 2b on both sides of the portable terminal
device 1 in this way, the effect of making the sound nondirectional is also obtained, and the user
listens to the sound in a ring centered on the portable terminal device 1. In this case, one
portable terminal device 1 can listen to a large number of people. For example, when listening to
the sound in such a state outside, it becomes possible if there is only one portable terminal
device 1, there is no need to bring other external speakers etc. together, and it is possible to
reduce the amount of luggage. At the same time, since the portable terminal device 1 is basically
carried at all times when going out, it is possible to avoid the situation of forgetting to bring it.
[0104]
FIG. 38 is a diagram showing a schematic configuration showing a nineteenth embodiment of a
sound reproduction system of a portable terminal device according to the present invention. As
shown in this figure, compared to FIG. 1, the portable terminal device 1 is provided with an
acoustic speaker 2 and an acoustic speaker 42 also serving as a call microphone. Thus, the
number of parts of the portable terminal device 1 can be reduced by combining the acoustic
speaker and the call microphone, and a reduction in size and weight can be realized.
[0105]
FIG. 39 shows a first modification of the nineteenth embodiment shown in FIG. As shown in the
figure, the portable terminal device 1 is provided with a sound speaker 2 and a sound speaker 43
also serving as a receiving speaker. Thus, the number of parts of the portable terminal device 1
can be reduced by combining the acoustic speaker and the receiving speaker, and a reduction in
size and weight can be realized.
[0106]
03-05-2019
32
FIG. 40 shows a second modification of the nineteenth embodiment shown in FIG. As shown in
the figure, the portable terminal device 1 is provided with an acoustic speaker 42 also serving as
a call microphone and an acoustic speaker 43 also serving as a reception speaker. Thus, the
number of parts of the portable terminal device 1 can be reduced by combining the acoustic
speaker with the call microphone and the reception speaker, respectively, and a reduction in size
and weight can be realized.
[0107]
FIG. 41 shows a third modification of the nineteenth embodiment shown in FIG. As shown in the
figure, the portable terminal device 1 is provided with a speaker 2 for sound and a speaker 44
for ringing which is also used as a ringer. Thus, the number of parts of the portable terminal
device 1 can be reduced by combining the acoustic speaker and the ringer, and a reduction in
size and weight can be realized.
[0108]
FIG. 42 shows a fourth modification of the nineteenth embodiment shown in FIG. As shown in the
figure, the portable terminal device 1 is provided with a speaker 2 for sound and a speaker 45
for sound which also serves as a vibrator for emitting a ringing tone. As described above, by
sharing the acoustic speaker and the vibrator, the number of parts of the mobile terminal device
1 can be reduced, and a reduction in size and weight can be realized.
[0109]
FIG. 43 shows a fifth modification of the nineteenth embodiment shown in FIG. As shown in the
figure, the portable terminal device 1 is provided with an acoustic speaker 2 and an acoustic
speaker 46 also serving as a screen display monitor. Thus, the number of parts of the portable
terminal device 1 can be reduced by combining the acoustic speaker and the screen display
monitor, and a reduction in size and weight can be realized.
[0110]
03-05-2019
33
FIG. 44 shows a sixth modification of the nineteenth embodiment shown in FIG. As shown in the
figure, the portable terminal device 1 is provided with a speaker 2 for sound and a speaker 47
for sound which is also used as a key panel. As described above, by combining the acoustic
speaker and the key panel, the number of parts of the portable terminal device 1 can be reduced,
and a reduction in size and weight can be realized.
[0111]
The acoustic data to be reproduced in the above description reproduces what is stored in the
built-in memory, medium, etc. built in the portable terminal device 1, or from an external source
such as a download site, personal computer (PC), etc. By handling the stored acoustic data so as
to be reproduced simultaneously with reception, the portable terminal device 1 has a structure
having both a sound source and an acoustic speaker. Since the acoustic data is limited in this
case, the acquisition range of the acoustic data is expanded as follows.
[0112]
FIG. 45 is a diagram showing a schematic configuration showing a twentieth embodiment in the
sound reproduction system of the portable terminal device according to the present invention. As
shown in this figure, compared to FIG. 40, the mobile terminal device 1 is provided with the
signal input terminal 50, and the signal input terminal 50 is connected to the acoustic signal
generator 52 through the data receiving cable 51. . The sound signal generator 52 is composed
of a personal computer, a deck and the like.
[0113]
According to the present invention, by making the portable terminal device 1 function like an
external sound speaker and adding a function of reproducing sound from another sound source,
it is possible to cope with more sound data. Furthermore, as a first modification of the twentieth
embodiment, the portable terminal device 1 is connected to a plurality of acoustic signal
generation devices 52, and the acquisition source of the input sound source is switched by a
switch. Thereby, convenience can be improved, for example, the sounds from a plurality of sound
sources can be easily compared.
03-05-2019
34
[0114]
Furthermore, as a second modification of the twentieth embodiment, in the case of reproducing
an input signal from the outside, a speaker that can be unpress-driven as the speech speaker 42
also serving as a call microphone and the sound speaker 43 also serving as a reception speaker.
By doing this, it is possible to reproduce sound in a state where the power of the portable
terminal device 1 itself is turned off. As a result, the portable terminal device 1 saves power, the
usable time for one charge increases, and high-quality sound reproduction becomes possible
without being tied to the remaining amount of the battery. In addition, the same effect can be
obtained even in the case of an acoustic speaker that is not also used as a call microphone or a
reception speaker. Furthermore, as a third modification of the twentieth embodiment, the
portable terminal device 1 obtains acoustic data from the acoustic signal generator 52 wirelessly,
for example, by bluetooth or the like. Since no cables are used, the system configuration can be
simplified.
[0115]
FIG. 46 is a diagram showing a schematic configuration showing a twenty-first embodiment of a
sound reproduction system of a portable terminal device according to the present invention. As
shown in this figure, as compared with FIG. 40, the portable terminal device 1 is provided with a
headphone attachment terminal 53, and the headphone attachment terminal 53 is connected to
the headphone 54 via the data receiving cable 51.
[0116]
In this way, it is possible to listen to stereo sound with the headphones 54 when there is no
leakage of sound to the surroundings, such as public transportation or a library. Furthermore, as
a first modification of the twenty-first embodiment, when it is not preferable that the sound is
heard by a third person in public transportation or the like, the reproduction sound is received
from the reception speaker of the portable terminal device 1 While being reproduced, it is
configured to be transmitted simultaneously with the call voice and reproduced from the
reception speaker of the other party.
03-05-2019
35
[0117]
This makes it possible to realize a conversation with comfortable BGM without causing much
inconvenience to the surrounding people. In addition, it is possible to make the conversation
more bouncing by selecting this station's noise, crowds, department stores, and tavern noises in
this BGM.
[0118]
DESCRIPTION OF SYMBOLS 1 ... Portable terminal device 2, 2a, 2b, 2c, 2d ... Speaker 2s ... Sound
speaker array 5, 5a, 5b ... Sound listening position 6 ... Case wall position 6 '... Porous part 7, 7a
of a case wall 7b, 7aR, 7aL, 7bR, 7bL ... propagation direction 8, 8 '... crosstalk prevention wall 11
... screen display monitor 12 ... key panel 13 ... earpiece 14 ... mouthpiece 15 ... antenna 20a, 20b
... reverse filter 22 24a 24b Delayer 23 Attenuator 31 Directional diaphragm signal processing
unit 32 Nondirectional signal processing unit 33 Switch unit 42 Acoustic speaker for call
microphone 43 Acoustic speaker for reception speaker 44 ··· Speaker for combined use with
ringer 45 ··· Speaker for combined use with vibrator 46 ····· Sound speaker for combined use with
screen display monitor 47 Hibiki speaker 50 ... signal input terminal 51 ... data receiving cable 52
... acoustic signal generator 53 ... wearing headphones terminal 54 ... headphone
03-05-2019
36
1/--страниц
Пожаловаться на содержимое документа