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JP2003264889

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DESCRIPTION JP2003264889
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
handset for a telephone, and more particularly to a handset capable of allowing a user to hear
voice and sound signals from a handset with both ears.
[0002]
2. Description of the Related Art A telephone set generally makes a call by placing a receiver on
one of the ears, but such single-earphone calls are difficult to hear call voices. In general, in
binaural hearing, the loudness is 1.5 times that of single ear hearing (binaural addition of
loudness). From this, it is desirable to be able to hear the voice / sound signal from the handset
with both ears in order to realize a better call.
[0003]
As a thing which can talk in both ears, there is a thing using headphones and a both-ears
earphone. As an example to which headphones are applied, there is a telephone handset
described in Japanese Utility Model Application Laid-Open No. 3-22454. This telephone handset
has an earpiece device of the same structure as headphones attached to the handset. A pad is
provided on the ear rest of the handset which is intended for one of the user's ears, which
constitutes one of the ear rests of the ear rest device. The other ear rest portion of the ear rest
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device is provided at the end of the support member which extends from the ear rest portion of
the handset to the other ear over the head of the user. The user can place a call with this earpiece
device on his head without holding the handset in his hand.
[0004]
Recently, for mobile phones, a small and simple system combining headphones and a
microphone has been provided, and the same effect as the above-described ear putting device
has been obtained.
[0005]
However, in the above-described conventional system using headphones, binaural earphones,
etc., it is necessary to wear earphones, headphones, etc. at the time of a call, which is very
troublesome. The
[0006]
Hands-free telephones have been provided so far as it is possible to talk with both ears without
wearing earphones or headphones.
However, in the case of this hands-free telephone, since the received voice or sound signal output
from one speaker is simply supplied to the user's ears, in some cases, the sound waves from the
speakers may be received in both ears. Due to the difference in space transfer function in both
paths until reaching, the sound waves supplied to both ears may be deviated by delay or the like,
which causes a problem that this interferes with a good call.
[0007]
An object of the present invention is to solve the above-mentioned problems and to provide a
handset capable of making a good conversation with both ears without wearing earphones or
headphones.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the handset of the present
invention is provided with a case which can be held by a user with one hand, and the case, and a
received voice or sound signal. First and second speakers supplying the sound waves to the
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user's respective ears as sound waves, and first space transmission between the sound waves
from the first speakers reaching one of the user's ears And filter means for canceling the
difference between the function and the second space transfer function until the sound wave
from the second speaker reaches the other ear of the user.
[0009]
In the present invention as described above, the receiving voice or sound signal is supplied from
the first and second speakers to the left ear and the right ear of the user, respectively, and the
filter means comprises the first and second filter means. It cancels out the difference in spatial
transfer function in both paths from the loudspeaker to each ear.
According to this structure, the same sound wave is supplied to both ears of the user from each
speaker, and the problem that the sound wave supplied to one ear is delayed as in the prior art
does not occur.
Therefore, a good call can be made by both ears.
In addition, with the normal operation in which the housing is attached to one ear, both-phone
communication is possible, and there is no bother in wearing conventional headphones and
binaural earphones.
[0010]
In the handset of the present invention having the above-mentioned configuration, at least one of
the first and second speakers may be a directional speaker. In this case, the first speaker is
provided at a portion of one end of the housing to be in contact with one of the user's ears, and
the second speaker is a directional speaker, and the other end of the housing is In the direction
of the other ear of the user.
[0011]
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According to the above configuration, since the speaker that is not in contact with the user's ear,
for example, the second speaker is configured by the directional speaker, the reception voice or
the acoustic signal leaks to the person around It is possible to prevent that. If the reception voice
or sound signal from the speaker that is not in contact with the user's ear leaks to the person
around, the reception voice or sound signal becomes noise for the person around.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention
will be described with reference to the drawings.
[0013]
(Embodiment 1) FIG. 1 is a schematic block diagram of a handset according to a first embodiment
of the present invention.
This handset is applicable to mobile phones (PHS (Personal Handy-Phone System) and mobile
phones), mobile phones (car phones), etc. other than fixed phones (public phones etc.). It has a
housing 1 of a predetermined shape that can be held by one user with one hand and applied to
one ear. The case 1 is a case of a device called a handset in the case of a fixed telephone, a
mobile telephone or the like, and a case of a portable device in the case of a portable telephone.
[0014]
In the case 1, in a state where the user addresses the case 1 to one ear, the speaker 30 is
disposed in a portion that is in contact with one of the ears, and in a portion close to the user's
mouth A microphone 10 is disposed. Further, in the housing 1, the directional speaker 20 is
disposed at a position where it is possible to supply an audio / sound signal (sound wave) to the
other ear of the user. In the example of FIG. 1, the directional speaker 20 is disposed adjacent to
the microphone 10 at a position opposite to the speaker 30 in the housing 1, and the direction is
directed to the other ear of the user. There is. The directional loudspeaker 20 and the
loudspeaker 30 are generally speaking handsets, and the microphone 10 is generally speaking
microphones.
[0015]
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In the handset shown in FIG. 1, voice and sound signals (sound waves) are output from the
directional speaker 20 and the speaker 30, respectively. The sound wave output from the
speaker 30 directly reaches one of the user's ears (here, the left ear). On the other hand, the
sound wave output from the directional speaker 20 is diffracted at a part (edge) of the user's face
and reaches the user's other ear (here, the right ear).
[0016]
FIG. 2 is a diagram for explaining the transfer function of each speaker of the handset shown in
FIG. In FIG. 2, HR is a space transfer function of the section until the sound wave from the
directional speaker 20 reaches the user's right ear, and HL is the sound wave from the speaker
30 reach the user's left ear Is the space transfer function of the interval at LS1 and LS2 are
transfer functions of the speaker 30 and the directional speaker 20, respectively. When the
handset shown in FIG. 1 is used, if the space transfer functions HL and HR are different, the voice
and sound signals that are heard by the user's both ears differ from each other in volume etc.
Become. In order to solve this problem, the handset of this embodiment is provided with the
following filter circuit.
[0017]
FIG. 3 is a block diagram showing a schematic configuration of the filter circuit of the handset
shown in FIG. In FIG. 3, reference numeral 100 denotes the handset shown in FIG. The filter
circuit 40 comprises digital filters 41 and 42, an applied filter 43 and an adder 44.
[0018]
The digital filter 41 is inserted into the input line of the speaker 30, and the digital filter 42 is
inserted into the input line of the directional speaker 20. The input line of the directional speaker
20 (the output line of the digital filter 42) is branched, and the branch line is connected to one
input of the adder 44 via the applied filter 43. The output line of the microphone 10 is connected
to the other input of the adder 44, and the output line of the adder 44 is connected to the output
line of the handset 100. The output line of the adder 44 is branched, which is connected to the
feedback input of the application filter 43. The input line of each digital filter 41, 42 is commonly
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connected to the input line of the handset 100. The input and output lines of the handset 100 are
connected to the telephone line 101 respectively. The configuration of the telephone function
such as sending and receiving in the handset 100 is well known and is not directly related to the
features of the present invention, and is therefore omitted in FIG.
[0019]
The digital filter 41 functions to cancel the difference between the space transfer functions HL
and HR so that the same voice and sound signal (sound wave) is supplied to the user's ears, and
is set as follows: There is.
[0020]
In order to supply the same voice / sound signal (sound wave) to both ears of the user, the
transfer function of the digital filter 41 needs to be HR · LS2 / HL / LS1 .
In general, the transfer function can be calculated using an impulse response, and the obtained
impulse response of the transfer function may be substituted as a constant of the digital filter.
However, in the case of the digital filter 41, the HL, LS1 inverse transfer function is required to
derive the transfer function. The digital filter 41 can not be physically created because the
impulse response of the digital filter 41 including such an inverse transfer function has a value at
a negative time.
[0021]
Therefore, in the present embodiment, the digital filter 42 is inserted in the input line of the
directional speaker 20. The digital filter 42 acts to delay the audio / sound signal. As a result, it is
possible to delay the value of the negative time of the digital filter 41 and shift to the value of the
positive time, so that the constant of the digital filter 41 can be determined.
[0022]
The determination of the constant of the digital filter 41 by the delay using the digital filter 42 as
described above can be realized by the inverse transfer function deriving method described in,
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for example, Japanese Patent Laid-Open No. 10-257599. The method of deriving the inverse
transfer function will be briefly described below.
[0023]
As described in the above-mentioned publication, in general, the transfer function of a speaker or
the like is not a minimum phase system, and therefore, a delay time is added to a unit impulse,
and a reverse impulse response having causality is often obtained. In this method, a sharp gain
occurs out of the band, and a good sound image localization can not be performed. In order to
solve this, in the above publication, the impulse response of the transfer function of the bandpass filter having the same out-of-band characteristics as the transfer function for which reverse
impulse response is desired is the impulse response of the target transfer function. The impulse
response of the inverse transfer function to obtain localization is determined.
[0024]
Also in this embodiment, the inverse transfer function of HL and LS1 is determined using the
inverse transfer function deriving method described in the above-mentioned publication. That is,
a band pass filter is used as a target transfer function required to derive the inverse transfer
function of HL and LS1. Then, in order to satisfy the causality, a delay is given to the impulse
response of the band-pass filter in deriving the inverse impulse response of HL and LS1. As a
result, the inverse impulse response of HL and LS1 has a delay corresponding to the delay given
to the impulse response of the band-pass filter. The impulse response of the digital filter 41 can
be calculated by performing a convolution operation on four types of impulse responses: the
inverse impulse response of HL and LS1 and the impulse response of HR and LS2. The impulse
response thus obtained is substituted as a constant of the digital filter 41.
[0025]
In the above state, since the digital filter 41 has the delay used in calculating the reverse impulse
response, a time difference occurs in the audio / sound signal presented to the user's ears. This is
because the delay response given by the impulse response of the digital filter 41 to the impulse
response of the band-pass filter used when calculating the inverse impulse response of the space
transfer function HL: (2) the transfer function LS1 of the speaker 30 By including the delay of the
sum of delay B applied to the impulse response of the band pass filter used in calculating the
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reverse impulse response (delay A + delay B). A digital filter 42 is used to solve this delay
problem. The digital filter 42 is a filter for giving a delay, which is obtained by applying a delay
(delay A + delay B) equal to the delay of the digital filter 41 to the impulse response of the band
pass filter. The transfer function of the digital filter 42 is obtained by Fourier-transforming the
impulse response of the band pass filter to which the delay (delay A + delay B) is added.
[0026]
The digital filters 41 and 42 configured as described above cancel the difference between the
space transfer functions HL and HR, and the sound wave from the speaker 30 reaching the user's
left ear and the directional speaker 20 reaching the right ear Sound waves are almost identical.
As a result, it becomes possible to present good voice and sound signals to the user's ears.
[0027]
The filter circuit 40 shown in FIG. 3 is provided with an application filter 43 and an adder 44 in
addition to the above-mentioned digital filters 41 and 42, which constitute an echo canceller. In
the handset shown in FIG. 1, since the directional speaker 20 is disposed close to the microphone
10, the voice / sound signal output from the directional speaker 20 wraps around the
microphone 10 and is echoed to the telephone line 101 side. And howling will be sent. This
wraparound is canceled by the application filter 43 and the adder 44. Specifically, the applied
filter 43 generates a pseudo echo by estimating transmission characteristics of a path in which
the echo wraps around, and the generated pseudo echo is reverse-phased to the output of the
microphone 10 by the adder 44. It cancels the echo by adding it.
[0028]
In addition, if directional microphones are used for the microphones 10, it is possible to reduce
the rounding of the sound from the directional speaker 20 (rounding of the echo) to some extent.
In this case, it is possible to remove the application filter 43, the adder 44 and the like.
[0029]
According to the handset of the present embodiment described above, the following effects can
be obtained in addition to the fact that good speech communication with both ears is realized by
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canceling the difference in the space transfer function for each speaker.
[0030]
Since the speaker 20 which is not in contact with the user's ear is composed of a directional
speaker, it is possible to prevent the reception voice or the sound signal from leaking to the
person around.
If the reception voice or sound signal from the speaker that is not in contact with the user's ear
leaks to the person around, the reception voice or sound signal becomes noise for the person
around.
[0031]
In addition, mobile phones and car phones, etc., which have spread rapidly in recent years, often
make a phone call outdoors, and there is a problem that it is difficult to hear a call voice at a
place where external noise is severe. In addition, the same problem occurs in fixed telephones.
For example, since public telephones and the like are installed along roads, noise from traveling
such as cars interferes with good calls. Such external noise disturbing a good call has been one of
the important problems in the conventional single ear communication and the hands free
telephone. According to the handset of the present embodiment, the receiving voice or the
acoustic signal is presented by the directional speaker 20 to the ear to which the handset is not
addressed, so that the size of the sound can be reduced. Binaural summation (in the case of
binaural hearing, the loudness is 1.5 times that of single ear hearing. The effect of) prevents the
disturbance of good calls due to external noise. Thereby, better calls can be realized.
[0032]
(Second Embodiment) The handset according to the first embodiment described above is in
monaural reproduction in which the directional speaker 20 and the speaker 30 transmit the
same voice / sound signal, but reproduction of a three-dimensional sound field (stereo
reproduction) It is also possible to do
[0033]
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FIG. 4 is a block diagram showing the configuration of a handset according to a second
embodiment of the present invention.
This handset has a structure for receiving voice and sound signals in two stereo channels, and is
substantially the same as the configuration shown in FIG. 3 except that a left / right reversing
circuit 50 and a setting unit 51 are provided.
[0034]
When performing stereo reproduction, the user's left ear needs to be supplied with an acoustic
signal for the left ear, and the right ear needs to be supplied with an acoustic signal for the right
ear. For example, as shown in FIG. 2, when the receiver is directed to the left ear, an acoustic
signal for the left ear is supplied from the speaker 30, and an acoustic signal for the right ear is
supplied from the directional speaker 20. Need to On the other hand, contrary to the case shown
in FIG. 2, when the receiver is directed to the right ear, the acoustic signal for the right ear is
supplied from the speaker 30, and the acoustic signal for the left ear from the directional speaker
20 is It needs to be supplied. Since it is up to the user to decide which ear the receiver is to be
addressed to, it is detected by any means which ear to which the handset has been addressed,
and the acoustic signal output from each speaker is for the right ear and left Need to switch to
the ear. In the present embodiment, the left / right inverting circuit 50 and the setting unit 51
are provided to perform such switching.
[0035]
The setting unit 51 sets whether the receiver is addressed to the right ear or the left ear. When
the receiver is addressed to the left ear, the left mode is set, and the address is addressed to the
right ear. Is set to the right mode. The setting of the left mode and the right mode is performed
by the user himself. For example, the setting unit 51 includes switches (buttons) corresponding
to the respective modes, and the user performs mode setting by pressing any switch. Also, as
another example, the setting unit 51 is used to select and input one of the displayed selection
buttons and the display panel on which selection buttons capable of setting each of the left mode
and the right mode are displayed. The mode setting is performed by having the operation key,
and the user selectively inputs one of the selection buttons displayed on the display panel.
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[0036]
The left / right inverting circuit 50 distributes and supplies the right channel acoustic signal and
the left channel acoustic signal received via the telephone line 101 to the directional speaker 20
and the speaker 30 according to the setting mode of the setting unit 51. Specifically, when the
setting mode of the setting unit 51 is the left mode, the left / right inverting circuit 50 supplies
the right channel acoustic signal to the directional speaker 20 and supplies the left channel
acoustic signal to the speaker 30. Conversely, when the setting mode of the setting unit 51 is the
right mode, the left / right inverting circuit 50 supplies the right channel acoustic signal to the
speaker 30, and supplies the left channel acoustic signal to the directional speaker 20. This
operation enables good stereo reproduction.
[0037]
In mobile phones, recently, services such as music distribution using the Internet have been
started, and stereo reproduction by the handset of this embodiment is particularly effective for
such services.
[0038]
(Third Embodiment) Although the handset according to the first and second embodiments
described above is configured such that the user holds the housing 1 with one hand, the housing
1 is used for the user. It is also possible to take the form of a known hands-free telephone set in
place.
In this case, the speaker 30 is also a directional speaker in the configurations of the handsets of
the first and second embodiments. Then, with the handset placed at a predetermined position
with respect to the user, the digital filters 41 and 42 of the filter circuit 40 are configured to
cancel the difference between the space transfer functions HL and HR.
[0039]
In the handset according to the present embodiment, unlike the case of the conventional handsfree telephone, with the handset placed at a predetermined position with respect to the user,
each digital filter 41, 42 sets the space transfer functions HL and HR Since the difference is
canceled out, good sound field reproduction is possible.
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[0040]
Moreover, since each of the speakers 20 and 30 is formed of a directional speaker, it is possible
to prevent the reception voice or the sound signal from leaking to the person around.
On the other hand, in the case of the conventional hands-free telephone, the reception voice or
sound signal from the speaker leaks to the person around, and the leaked reception voice or
sound signal becomes noise for the person around The
[0041]
(Fourth Embodiment) In the first usage mode in which the user holds the housing 1 with one
hand, and in the second usage mode in which the housing 1 is placed at a predetermined position
with respect to the user, space The difference between the transfer functions HL and HR can also
be configured to be cancelled. Hereinafter, a specific configuration for realizing such an
operation will be described.
[0042]
FIG. 5 is a block diagram showing a schematic configuration of a handset according to a fourth
embodiment of the present invention. In the configuration of the first embodiment, in the
configuration of the first embodiment, the handset according to the present embodiment can be
used to selectively set and enter the first usage pattern and the second usage pattern. Of the
digital filter 41a, 42a in which the constant corresponding to the first mode of use is set, and the
digital filter 41b, 42b in which the constant corresponding to the second mode of use is set. A
switching unit 60a configured to switch between the line of the digital filters 41a and 42a and
the line of the digital filters 41b and 42b according to the use forms set by the use form setting
unit 61 while being configured by four filters. 60b is provided.
[0043]
The digital filters 41a and 42a function to cancel the difference between the space transfer
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functions HL and HR in the first mode of use. On the other hand, the digital filters 41a and 42a
function to cancel the difference between the space transfer functions HL and HR in the second
mode of use. Each of the speakers 20 and 30 is a directional speaker. In the example shown in
FIG. 5, only the feature portion is shown, and portions such as an adaptive filter that are not very
relevant to the feature of the present embodiment are omitted.
[0044]
In the handset according to this embodiment, when the user sets the first usage pattern in the
usage pattern setting unit 61, the lines of the digital filters 41a and 42a are selected by the
switching units 60a and 60b. Thereby, the same effect as that of the first or second embodiment
can be obtained. When the user sets the second usage pattern in the usage pattern setting unit
61, the lines of the digital filters 41b and 42b are selected by the switching units 60a and 60b.
Thereby, the same effect as that of the third embodiment is obtained.
[0045]
(Fifth Embodiment) The third and fourth embodiments described above presuppose use in a state
where the housing 1 is placed at a predetermined position with respect to the user. Can be given.
However, the space transfer functions HL and HR will change if the case 1 is placed at an
arbitrary place or the user moves during a call, so the third and fourth embodiments will be
described. Can not be adopted. Here, in a usage form such as a hands-free telephone, a
configuration in which a good call can be made even when the case 1 is arranged at an arbitrary
place or the user moves during a call will be described. .
[0046]
FIG. 6 is a block diagram showing a schematic configuration of a handset according to a fifth
embodiment of the present invention. In the configuration of the first embodiment (FIG. 3), the
handset according to the present embodiment can newly provide the use position detection unit
71 and replace the digital filters 41 and 42 of the filter circuit 40 to update the filter coefficients.
The digital filters 41c and 42c are provided.
[0047]
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Each of the speakers 20, 30 faces in substantially the same direction, and is configured to
propagate the sound waves outputted while spreading to some extent. Within the range of the
spread of the sound wave, the user can listen to the received voice or sound signal from each of
the speakers 20 and 30 even when moving.
[0048]
The use position detection unit 71 detects the position of the user from the reference surface
based on the surface on which the speakers 20 and 30 of the housing 1 are provided.
Specifically, from the reference plane, it is detected in which direction and at what distance the
user is. In this detection result, the distance of the section until the sound wave from the speaker
20 reaches the ear of the user and the distance of the section until the sound wave from the
speaker 30 reaches the other ear of the user are shown. include.
[0049]
The position information detected by the use position detection unit 71 is input to each of the
digital filters 41 c and 42 c of the filter circuit 40. The filter circuit 40 obtains an appropriate
transfer function (can cancel the difference between the space transfer functions HL and HR)
according to the input position information (distance information), and its impulse response
serves as a filter coefficient for each digital filter It is substituted into 41c and 42c.
[0050]
According to the above configuration, for example, even if the user moves during a call and the
space transfer functions HL and HR change, the filter coefficients of the digital filters 41c and
42c are updated along with the movement, and space transfer is performed. Since it works to
cancel the difference between the functions HL and HR, the user can always be provided with a
good binaural call.
[0051]
The use position detection unit 71 may be directly provided to the housing 1 or may be separate
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from the housing 1.
The use position detection unit 71 may be anything as long as it can specify the position of the
user (at least the distance from the reference surface to the user) from the reference surface of
the housing 1. Good. For example, it is generally known that the position of an object to be
measured can be specified by emitting radio waves and receiving reflected waves from the object
to be measured, and the use position detection unit 61 is configured using this method. can do.
Besides the method using radio waves, those using light or infrared rays are also known.
[0052]
In addition to the above method of specifying the position using radio waves, light, infrared rays,
etc., for example, a dummy microphone is provided to the user, and the specific sound wave
transmitted from the housing 1 is received by the dummy microphone There is also a method of
identifying the position of the user. In this case, a space transfer function is assumed from the
reception signal by the dummy microphone, and distance information from the reference plane
of the housing 1 to the user is acquired from the assumed space transfer function.
[0053]
Furthermore, a method of detecting the position of the user by image processing image data
captured using an imaging camera or the like is also applicable.
[0054]
As described above, according to the present invention, there is an effect that there is no bother
of wearing earphones and headphones, and it becomes possible to make a good telephone call
without using conventional ones. .
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