JP2005311501

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DESCRIPTION JP2005311501
PROBLEM TO BE SOLVED: To improve the quality of sound during music reproduction in a
portable terminal device. SOLUTION: In the case of a portable terminal apparatus having a
structure in which a display unit 4 is provided at the upper part of the case surface and various
operation keys 7 to 15 and 19 are arranged at the lower part of the case surface, provided in the
lower part of the case surface. By arranging a plurality of speakers 16 and 17 in two sets on both
sides of the same housing surface with the frequently used four-way key 19 interposed
therebetween, the user can use four directions when using the portable terminal device. Music
generated by the speakers 16 and 17 recognized by the user by the isolation of the sound from
the speakers 16 and 17 by the fingers by utilizing the possibility that the finger 19 is placed on
the key 19 Improve stereo effects and surround effects. [Selected figure] Figure 1
Mobile terminal device
[0001]
The present invention relates to a portable terminal device capable of realizing high quality
sound at the time of music reproduction.
[0002]
Conventionally, in portable terminal devices such as mobile phones, PHS (Personal Handyphone
System), PDA (Personal Data Assistance, Personal Data Assistants: personal information
communication devices for personal use), electronic sound is generally used for call notification.
A method of transmitting from a speaker is used.
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Also, in many cases, it has a music playback function, and means for notifying by playing music is
also used. Furthermore, in the application such as a game on the portable terminal device, higher
quality content is realized by the screen display on the liquid crystal display unit and the music
emitted from the speaker. As the music reproduction function of such a portable terminal device,
by mounting a plurality of speakers, it is possible to realize the spread of the sound by the stereo
effect, and by providing the surround function, a higher quality notification Methods of
implementing the means are also used.
[0003]
Many portable terminal devices are assumed to be carried at all times, and therefore, many are
miniaturized so as to be convenient for carrying, and therefore, the position where a built-in
speaker can be incorporated is limited. Therefore, in order to enable further miniaturization, a
speaker for music reproduction is often disposed at a position different from the key operation
surface. For example, there are cases where the speaker is mounted on the side opposite to the
key button arrangement side which is the operation side, but since the sound is transmitted from
the back of the device, the distance from the sound source makes When performing the
operation, the result is that the surround effect of the music is reduced. In this case, although the
stereo effect and the surround effect occur in proportion to the isolation based on the distance
between the speakers, a small shield (for example, a finger or the like) can not be obtained due to
the miniaturization. By placing the speaker between the speakers, the stereo effect and the
surround effect were in a state of rising, but no means for actively using such an effect has been
taken.
[0004]
As described above, in the conventional portable terminal device, there is a problem that the
stereo effect and the surround effect can not be surely obtained because the distance between
the plurality of speakers can not be sufficiently long. The present invention has been made in
view of the above-described circumstances, and an object of the present invention is to provide a
portable terminal device capable of improving the stereo effect and surround effect of music
generated during operation.
[0005]
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In order to solve the above-mentioned problems, the invention according to claim 1 relates to a
portable terminal device, in a portable terminal device having a function of reproducing music as
stereo sound and / or surround sound, in the housing surface of the portable terminal device A
plurality of speakers are divided into two sets on both sides of the same housing surface with a
portion where the user is likely to put a finger when using the portable terminal device, and the
above two sets of speakers are respectively provided. It is characterized in that it is configured to
be driven by a stereo sound signal or a surround sound signal.
[0006]
The invention according to claim 2 relates to the portable terminal device according to claim 1,
wherein the portable terminal device has a display unit on one side of the casing surface, and the
user on the other side of the casing surface The present invention is characterized in that the
above two sets of speakers are disposed separately on both sides of the same housing surface
with a portion likely to be mounted therebetween.
[0007]
The invention according to claim 3 relates to the portable terminal device according to claim 1,
wherein the portable terminal device has an upper case provided with a display unit on the case
surface, and various operation keys arranged on the case surface. A portable telephone
configured to be foldable so that the two housing surfaces face each other via a hinge part,
wherein a portion of the lower housing surface on which the user is likely to place a finger is The
above two sets of speakers are disposed on both sides of the same housing surface by being
sandwiched therebetween.
[0008]
The invention according to claim 4 relates to the portable terminal device according to any one
of claims 1 to 3, characterized in that the portion where the finger is likely to be placed is the
upper surface of the key which is frequently used. And
[0009]
The invention according to claim 5 relates to the portable terminal device according to claim 4,
wherein the frequently used key is a four-way key.
[0010]
The invention according to claim 6 relates to the portable terminal device according to any one
of claims 1 to 5, wherein the stereo sound signal is generated by converting data held in the
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storage means in the music reproduction means. According to the music data of stereo sound, the
music output means is converted to an analog signal and generated.
[0011]
The invention according to claim 7 relates to the portable terminal device according to any one
of claims 1 to 6, wherein the surround sound signal is a music coefficient and surround
coefficient means for music data of the stereo sound. Through control of the respective phases
and amplitudes of the music data of the stereo sound, and conversion into an analog signal.
[0012]
The invention according to claim 8 relates to the portable terminal device according to claim 7,
wherein the surround coefficient means adjusts first and third phases of one of the music data of
the stereo sound and the third phase, respectively. · Amplitude adjusting means, second and
fourth phase / amplitude adjusting means for adjusting the other phase and amplitude of the
other music data of the stereo sound, and outputs of the first to fourth phase / amplitude
adjusting means First to fourth D / A converting means for converting into an analog signal, first
combining means for combining the outputs of the first and second D / A converting means, and
the third and fourth D for converting Second combining means for combining the output of the A
/ A conversion means, and first for generating a first surround sound signal for driving the first
set of speakers by amplifying the output of the first combining means Speaker driving means,
and the above second composition It is characterized by and a second loudspeaker drive means
for generating a second surround sound signals for driving the second set of speakers by
amplifying the output of the stage.
[0013]
The invention according to claim 9 relates to the portable terminal device according to claim 8,
wherein the stereo sound signal deactivates the first to fourth phase / amplitude adjusting means
in the surround coefficient means. The present invention is characterized in that the first phase /
amplitude adjusting means is bypassed by the first bypass means, and the fourth phase /
amplitude adjusting means is bypassed and generated by the second bypass means.
[0014]
In the mobile terminal device of the present invention, the speaker is disposed on both sides of
the same housing surface with the key frequently operated in between, on the housing surface,
so that the user places a finger on the key for the operation. In this case, the user can listen to
music, and the user's finger acts as a shield to enhance the isolation between the two speakers
and to improve the stereo effect and surround effect of the sound transmitted from both
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speakers. Can.
[0015]
In a portable terminal device having a function of reproducing music as stereo sound and / or
surround sound, the same housing is provided on the housing surface thereof with a portion
where the user is likely to place a finger when using the mobile terminal device. A plurality of
speakers are arranged in two sets on both sides of the body surface, and the two sets of speakers
are driven to output stereo sound or surround sound, respectively.
[0016]
FIG. 1 is a view showing an appearance configuration of a mobile phone which is an embodiment
of a mobile terminal device of the present invention, FIG. 2 is a circuit diagram showing a
configuration of main parts of the mobile terminal device of this embodiment, and FIG. FIG. 4 is a
diagram showing a circuit configuration of a music output unit in the portable terminal device of
the present embodiment, and FIG. 4 is a view for explaining generation of stereo sound and
surround sound in the portable terminal device of the present embodiment.
[0017]
As shown in FIG. 1, the mobile terminal device of this example mechanically couples the upper
case 1, the lower case 2, the upper case 1 and the lower case 2, and the upper case 1 and the
lower case 2. It is roughly comprised from the hinge part 3 for making an electrical connection
between the lower housing ¦ casing 2 and.
[0018]
The upper case 1 has a display unit 4 provided with a monochrome or color liquid crystal panel
or an organic EL (Electronic Luminescence) panel for displaying various information on the front
of the case, and for listening to received voice. Upper receiver 5 and lower receiver 6 are
provided.
In the lower case 2, an Internet mode button 7 for selecting the operation state in the Internet
mode, and a menu button 8 for displaying and selecting various operation functions are selected
on the front of the case. The decision key 9 for deciding various operation modes, the mail button
10 for selecting the mail text creation mode, etc., the telephone directory button 11 for reading
out the registered telephone number, and the designated operation state Start key 12 for starting
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the operation, the clear key 13 for canceling the designated operation state, the end key 14 for
ending the transmission and reception, and the numbers 0 to enter the telephone number and
the mail text. 9 and a numeric keypad 15 consisting of symbols # and *, a left speaker 16 and a
right speaker 17 for transmitting reproduced music, and a microphone for inputting voice 8, the
four-direction key 19 for performing operation and the like on the screen during scrolling and
game operation items on the screen are provided.
The left speaker 16 and the right speaker 17 are disposed separately on the lower housing
surface on the left and right with the four-way key 19 interposed therebetween.
At the time of folding, the mobile terminal device of this example has a structure in which the
upper case 1 and the lower case 2 are folded by the hinge portion 3 so that the front surfaces
thereof face each other.
[0019]
Moreover, as shown in FIG. 2, the electrical configuration of the main part in the portable
terminal device of this example is the display unit 4, the left speaker 16, the right speaker 17, the
control unit 21, the transmission / reception unit 22, and storage A section 23, a music
reproduction section 24, a music output section 25 and a key input section 26 are schematically
configured.
Among these, the display unit 4, the left speaker 16, and the right speaker 17 are the same as
those shown in FIG.
[0020]
The control unit 21 includes a CPU (Central Processing Unit), controls the entire operation of the
mobile terminal device, converts transmission voice from the microphone 18 into digitized
transmission data, and supplies the transmission data to the transmission / reception unit 22. It
performs processing such as converting the digitized reception data from the transmission /
reception unit 22 into an analog signal and supplying it to the receivers 5 and 6, and further
performs control such as reading data stored in the storage unit 23.
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The transmission / reception unit 22 converts the transmission data output from the control unit
21 into a radio signal and supplies the radio signal to an antenna (not shown), converts the radio
signal input from the antenna into reception data, and transmits the reception data to the control
unit 21 .
The storage unit 23 includes a ROM (Read Only Memory), and stores data such as music in
advance.
The music reproduction unit 24 converts the data input from the control unit 21 through the
music output unit 25 into music data, and outputs the data as stereo data of equal phase and
equal amplitude, for example.
The music output unit 25 drives the left speaker 16 and the right speaker 17 by the stereo data
input from the music reproduction unit 24 or by the surround data generated from the stereo
data.
The key input unit 26 generates an output for controlling the operation of the music output unit
25 in accordance with the operation of the key on the housing surface.
[0021]
The configuration of the music output unit 25 in this example is, as shown in FIG. 3, a left
speaker 16, a right speaker 17, phase / amplitude control circuits 31 to 34, and digital / analog
(D / A) conversion circuits 35 to 38. And synthesis circuits 39 and 40, speaker driving circuits 41
and 42, a key input circuit 43, and bypass circuits 44 and 45.
Among these, the speakers 16 and 17 are the same as those shown in FIG.
[0022]
The phase / amplitude adjustment circuits 31 and 33 receive one stereo data input M1 from the
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music reproduction unit 24, adjust the phase and amplitude thereof, and output the result.
The phase / amplitude adjustment circuits 32, 34 receive the other stereo data input M2 from
the music reproduction unit 24, adjust their phases and amplitudes, and output them.
The D / A conversion circuits 35 to 38 convert the digital sound signals from the phase /
amplitude adjustment circuits 31 to 34 into analog sound signals and output the analog sound
signals.
The combining circuit 39 combines and outputs the output signals of the D / A converting
circuits 35 and 36, and the combining circuit 40 combines and outputs the output signals of the
D / A converting circuits 37 and 38. The speaker drive circuits 41 and 42 amplify the outputs of
the synthesis circuits 39 and 40, respectively, and supply them to the left speaker 16 and the
right speaker 17, respectively. The key input circuit 43 generates an output for controlling the
operating states of the phase / amplitude adjusting circuits 31 to 34 and the bypass circuits 44
and 45 in accordance with the output from the key input unit 26. The bypass circuits 44 and 45
bypass between the input and output of the phase / amplitude adjustment circuits 31 and 34,
respectively.
[0023]
FIG. 4 illustrates generation of stereo sound and surround sound in the mobile terminal device of
this example. Hereinafter, with reference to FIGS. 1 to 4, the operation at the time of stereo
sound generation will be described. In the portable terminal device of this example, when it is
intended to generate music consisting of a ringing tone, a sound effect melody at the time of
game operation, etc. by stereo sound, the display unit is pressed by pressing the menu button 8
on the front of the case. Since various operation modes are displayed on the display screen 4, for
example, the four-way key 19 is operated to select the stereo sound mode on the display screen,
and the determination key 9 is pressed to confirm this selected state. The key input unit 26
receives the selected state and controls the key input circuit 43, whereby the key input circuit 43
generates an output to disable the phase / amplitude adjustment circuits 31 to 34, The bypass
circuits 44 and 45 are put into operation.
[0024]
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In this state, when data of a specific music is read out from the storage unit 23 based on, for
example, detection of an incoming call or the operation of the control unit 21 accompanying the
progress of the game, the control unit 21 transmits this data via the music output unit 25. To the
music reproduction unit 24. The music reproduction unit 24 generates music data M1 and M2 of
stereo sound from the input data and returns the music data to the music output unit 25. The
music output unit 25 inputs the music data M1 and M2 to the D / A conversion circuits 35 and
38 through the bypass circuits 44 and 45, respectively, and thereby outputs an analog signal
from the D / A conversion circuits 35 and 38. S1 and S2 are sent out. The output S1 is amplified
through the synthesizing circuit 39 and the speaker driving circuit 41 and supplied to the left
speaker 16, and the output S2 is amplified through the synthesizing circuit 40 and the speaker
driving circuit 42 and supplied to the right speaker 17. As a result, the sounds P1 and P2 sent
from the speakers 16 and 17 are transmitted to the left ear 51 and the right ear 52, respectively,
and are spatially synthesized and recognized as a melody sound having a stereo effect by the
user 53. Ru.
[0025]
Further, in the portable terminal device of this example, when it is intended to generate music
consisting of ringing tones, sound effects during game operation, etc. by surround sound, the
menu buttons 8 and 4 are used as in the case of stereo operation. The surround sound mode is
selected on the display screen by the operation with the direction key 19, and the determination
key 9 is depressed to confirm the selected state. The key input unit 26 receives the selected state
and controls the key input circuit 43, whereby the key input circuit 43 generates an output to
activate the phase / amplitude adjustment circuits 31 to 34 and bypass the operation. Circuits 44
and 45 are disabled.
[0026]
In this state, when data of a specific music is read out from the storage unit 23 based on, for
example, the operation of the control unit 21 associated with the detection of an incoming call or
the progress of the game, the music reproduction unit 24 similarly to the stereo operation. Music
data M1 and M2 of stereo sound are input to the music output unit 25. In the music output unit
25, the phase / amplitude adjusting circuits 31 and 33 adjust and output the phase and
amplitude of the music data M1, and the phase and amplitude adjusting circuits 32 and 34 adjust
and output the phase and amplitude of the music data M2 Do. The D / A conversion circuits 35,
36 D / A convert the outputs of the phase / amplitude adjustment circuits 31, 32 to generate
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outputs S1, S4 consisting of analog signals, and the D / A conversion circuits 37, 38 have phases
The outputs of the amplitude adjustment circuits 33 and 34 are D / A converted to generate
outputs S3 and S2 formed of analog signals.
[0027]
The synthesis circuit 39 synthesizes the outputs S1 and S4 from the D / A conversion circuits 35
and 36 to generate an output (S1 + S4), and the speaker drive circuit 41 amplifies the output (S1
+ S4) and supplies it to the left speaker 16 Therefore, the sound P1 based on S1 and the sound
P4 based on S4 are sent out from the left speaker 16 into space. The synthesizing circuit 40
synthesizes the outputs S2 and S3 from the D / A converting circuits 37 and 38 to generate an
output (S2 + S3), and the speaker driving circuit 42 amplifies the output (S2 + S3) to generate a
right speaker 17 Since the sound is supplied, the sound P2 based on S2 and the sound P3 based
on S3 are sent out to space from the right speaker 17. As a result, the sound P1 sent from the left
speaker 16 and the sound P3 sent from the right speaker 17 are spatially synthesized and
transmitted to the left ear 51, and the sound P4 sent from the left speaker 16 and the right
speaker 17 Since the sound P2 transmitted from the terminal is spatially synthesized and
transmitted to the right ear 52, the user 53 uses the sound from the left ear 51 (P1 + P3) and the
sound from the right ear 5 (P2 + P4). Recognize music with surround effects.
[0028]
As shown in FIG. 4, the sound transmitted from the left speaker 16 and the right speaker 17
propagates in the space to reach both ears of the user 53. At this time, the sound transmitted
from both the speakers 16 and 17 The path through which the sound reaches the user's left ear
51 and the right ear 52 is, for example, P1 and P3 for the left ear 51 as shown schematically in
FIG. In contrast, the sound heard by the user 53 with the left ear 51 and the sound heard with
the right ear 52 are shown by the difference between the phase and the amplitude of the sound
in each case by passing through paths such as P2 and P4. As a result, the user 53 hears a sound
with a surround effect.
[0029]
Under the present circumstances, when the position of both speakers 16 and 17 approaches and
the phase difference and the amplitude difference of sound P1 and P3 are small, it becomes
difficult for a user to recognize a surround effect.
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The same applies to the sounds P2 and P4. However, if there is a shield between the two
speakers 16 and 17, the phase difference and the amplitude difference become large, and the
surround effect is enhanced. Therefore, by arranging the four-way key 19 in the middle of both
the speakers 16 and 17 and creating a situation where the user always puts a finger on it in use,
the space between both the speakers 16 and 17 is created. Isolation is enhanced, the phase
difference / amplitude difference of the sounds P1 and P3 becomes clear, and it becomes easy to
confirm the surround effect. The same applies to the sounds P2 and P4.
[0030]
As described above, in the portable terminal device of this example, the music having the stereo
effect and the music having the surround effect are selected and listened to by the monaural
music data based on the data held in advance in the storage unit 23. Can. Such stereo effects and
surround effects are generated in proportion to the isolation based on the distance between the
left speaker 16 and the right speaker 17 as described above, but in the portable terminal device
of this example, the left Since the speaker 16 and the right speaker 17 are separately disposed
left and right on the housing panel surface with the four-way key 19 interposed between both
the speakers, the user can display the display unit 4 when using the portable terminal device.
When operating the four-way key 19 while looking, the user's finger placed on the four-way key
19 serves as a shield and the isolation between the two speakers 16 and 17 is enhanced. , The
phase difference / amplitude difference of the sounds P1 and P3 with respect to the left ear 51
and the phase difference / amplitude difference of the sounds P2 and P4 with respect to the right
ear 52 are respectively clear, and stereo is more effectively performed. It can be obtained fruit
and surround effect.
[0031]
The embodiment of the present invention has been described in detail with reference to the
drawings, but the specific configuration is not limited to this embodiment, and changes in design
etc. may be made without departing from the scope of the present invention. Included in the
invention. For example, in the embodiment, a foldable mobile phone has been described as an
example of a mobile terminal device, but the present invention is not limited to this case, and it is
possible that the key arrangement unit and the speaker unit are on the same housing surface. For
example, it is applicable irrespective of the shape structure of a portable terminal device. In this
case, it is preferable to arrange the display unit on one of the housing surfaces and a portion
having a high possibility of placing a finger on the other. Further, in the case of the present
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invention, it is necessary that a portion having a high possibility that the user puts a finger on the
mobile terminal device is present between the left speaker and the right speaker. For example,
the upper surface of a key frequently used when using a portable terminal device, such as a fourway key, is an example in this case, but not limited to this case, it is a structure other than other
keys or keys. May be Also, the number of speakers is not limited to two, and an arbitrary plural
number of speakers may be divided into two sets and arranged on both sides of a portion where
a finger is likely to be placed on the same housing surface.
[0032]
The present invention is not limited to existing portable terminal devices such as portable
telephones, PHSs, PDAs, etc., and can be used in various small-sized portable information
communication devices having a music reproduction function that may appear in the future. .
[0033]
It is a figure which shows the external appearance structure of the mobile telephone which is one
Example of the portable terminal device of this invention.
It is a circuit diagram which shows the structure of the principal part of the portable terminal
device of the Example. It is a figure which shows the circuit structure of the music output part in
the portable terminal device of the Example. It is a figure for demonstrating the production ¦
generation of the stereo sound in the portable terminal device of the Example, and a surround
sound.
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 4 display part 16 left speaker 17 right speaker 19 four-way key 21
control part 22 transmission / reception part 23 memory ¦ storage part (storage means) 24
music reproduction part (music reproduction means) 25 music output part (music output means)
26 key input part 31- 34 Phase and amplitude adjustment circuit (phase and amplitude
adjustment means) (surround coefficient means) 35 to 38 D / A conversion circuit (D / A
conversion means) (surround coefficient means) 39, 40 synthesis circuit (composition means)
(surround coefficient) Means) 41, 42 Speaker drive circuit (speaker drive means) (surround
coefficient means) 43 Key input circuit 44, 45 bypass circuit (bypass means)
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