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DESCRIPTION JP2001211249

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DESCRIPTION JP2001211249
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
voice communication apparatus configured to be capable of hands-free calling.
[0002]
SUMMARY OF THE INVENTION For example, a car-mounted telephone apparatus mounted on a
car generally has a hands-free function which can realize hands-free calling. In hands-free calling,
in addition to the handset, the speaker for outputting the receiving sound and the microphone
for inputting the transmitting sound are disposed, for example, on a dashboard in the car,
thereby making it unnecessary to have the handset. It is possible to make a call, which allows the
user to secure the safety during driving.
[0003]
By the way, in such a hands-free call, when the reception sound output from the speaker is input
to the microphone and transmitted to the other party, there is a possibility that an acoustic echo
may occur, and an acoustic echo may occur. , There is a problem that it interferes with the call.
Therefore, this type of telephone apparatus is generally configured to have an echo canceller
function so as to be able to cancel the acoustic echo caused by the reception sound output from
the speaker being input to the microphone. There is.
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[0004]
However, when the volume of the reception sound is extremely large, there is a problem that
acoustic echo can not be sufficiently canceled only by operating the echo canceller function.
Therefore, in recent years, a configuration in which the above-described echo canceller function
and echo suppression function are used in combination is provided. In this case, the echo
suppression function attenuates the level of the transmission signal output from the microphone
according to a predetermined attenuation amount on the condition that it is in the reception
state, and then transmits the transmission signal to the other party. It is.
[0005]
However, in the conventional configuration in which the echo canceller function and the echo
suppression function are used in combination, since the attenuation amount for attenuating the
level of the transmission signal is constant, the following problems occur. there were.
[0006]
That is, when the attenuation amount for attenuating the level of the transmission signal is set to
a relatively small value, that is, when the attenuation amount of the level of the transmission
signal is relatively small, the sense of interruption of voice is improved. However, at this time, if
the volume of the reception sound output from the speaker is relatively large, the amount of
attenuation of the level of the transmission signal is relatively small, so that the acoustic echo can
not be sufficiently canceled. There was a problem.
[0007]
On the other hand, on the other hand, if the amount of attenuation that attenuates the level of
the transmission signal is set to a relatively large value, that is, if the amount of attenuation of
the level of the transmission signal is relatively large, Although the echo can be sufficiently
canceled, at this time, if the volume of the received sound output from the speaker is relatively
small, the amount of attenuation of the level of the transmission signal is relatively large. There
was a problem that the sense of interruption was deteriorated.
[0008]
The present invention has been made in view of the above-described circumstances, and an
object thereof is to be able to sufficiently cancel the acoustic echo even when the volume of the
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receiving sound is relatively large, and it is also possible to It is an object of the present invention
to provide a voice communication apparatus capable of avoiding deterioration of the sense of
interruption of voice even in the case where the volume is relatively small, thereby improving the
usability.
[0009]
According to the voice communication apparatus of the first aspect, the receiving sound output
means inputs a receiving signal and outputs a receiving sound, and the transmitting sound input
means transmits a transmitting sound. The echo canceller cancels an acoustic echo caused by the
reception sound output from the reception sound output means being input to the transmission
sound input means.
The control means operates the transmission signal attenuation means on condition that the
reception state detection means detects that the reception state is received, and the transmission
signal attenuation means is outputted from the transmission sound input means. Attenuate the
level of the transmission signal.
[0010]
At this time, when the control means determines that the volume of the reception sound output
from the reception sound output means is relatively large, the state in which the attenuation
amount of the transmission signal level in the transmission signal attenuation means is relatively
large. If it is determined that the volume of the reception sound output from the reception sound
output unit is relatively small, the attenuation amount of the transmission signal level in the
transmission signal attenuation unit is relatively reduced. The transmission signal attenuation
means is operated in a reduced state.
[0011]
That is, according to this configuration, when it is determined that the volume of the reception
sound is relatively large, the level of the transmission signal is attenuated while the attenuation
amount of the level of the transmission signal is relatively large. However, even if the volume of
the reception sound is relatively large, the acoustic echo can be sufficiently canceled because the
attenuation of the level of the transmission signal is relatively large.
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On the other hand, when it is determined that the volume of the reception sound is relatively
small, the level of the transmission signal is attenuated while the amount of attenuation of the
level of the transmission signal is relatively small. Even when the volume of the reception sound
is relatively small, since the attenuation amount of the level of the transmission signal is
relatively small, it is possible to avoid the deterioration of the sense of interruption of the voice.
Thereby, the usability can be improved.
[0012]
According to the voice communication apparatus of the second aspect, the control means stops
the operation of the transmission signal attenuation means when it is determined that the volume
of the reception sound output from the reception sound output means is equal to or less than the
predetermined level.
[0013]
That is, according to this configuration, when it is determined that the volume of the reception
sound is lower than the predetermined level, the operation of the transmission signal attenuation
means is stopped, so that the volume of the reception sound is extremely small. When the
acoustic echo can be sufficiently canceled only by operating the echo canceller function,
unnecessary operation of the transmission signal attenuation means can be avoided in advance.
[0014]
According to the voice communication apparatus of the third aspect, the receiving sound volume
setting means can mechanically set the sound volume of the receiving sound, and the control
means determines the setting value in the receiving sound volume setting means. The volume of
the reception sound output from the output means is determined.
[0015]
That is, according to this configuration, the reception sound volume setting unit is configured to
determine the volume of the reception sound by determining the set value mechanically set, so
that the reception sound can be The volume can be determined.
[0016]
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According to the voice communication apparatus of the fourth aspect, the receiving sound
volume setting means can mechanically set the sound volume of the receiving sound, and the
receiving sound volume calculation means sets the setting value in the receiving sound volume
setting means and the level of the receiving signal. The volume of the receiving sound output
from the receiving sound output means is estimated and calculated based on the relationship of
Then, the control means determines the volume of the reception sound output from the reception
sound output means by determining the calculation result in the reception sound volume
calculation means.
[0017]
That is, according to this apparatus, not only the setting value mechanically set by the reception
volume setting unit, but also the reception based on the relationship between the setting value
mechanically set by the reception volume setting unit and the level of the reception signal Since
the volume of the receiving sound is determined by estimating and calculating the volume of the
sound and determining the calculation result, the volume of the receiving sound is determined in
comparison with that described in claim 3 above. Accuracy can be increased.
[0018]
According to the voice communication apparatus of the fifth aspect, the reception state detection
means detects whether or not the reception state is established by comparing the level of the
reception signal with the level of the transmission signal.
[0019]
That is, according to this configuration, it is configured to detect whether or not it is in the
reception state by comparing the level of the reception signal with the level of the transmission
signal, so that the level of the reception signal and the transmission signal are detected. Based on
the result of comparison with the level, it can be accurately detected whether or not it is in the
receiving state.
[0020]
According to the voice communication apparatus of the sixth aspect, the control means can
change the attenuation amount of the level of the transmission signal in the transmission signal
attenuation means.
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[0021]
That is, according to this configuration, since the attenuation amount of the transmission signal
level in the transmission signal attenuation means can be changed, for example, the attenuation
amount of the transmission signal level is made an optimal value according to the form of the
system. It can be flexibly coped with, for example, can be set, and can be expanded in usage.
[0022]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) The first embodiment of
the present invention will be described below with reference to FIGS. 1 to 3. FIG.
FIG. 1 shows a portion related to the gist of the present invention as a functional block diagram.
First, in the voice communication apparatus 1, when a voice transmission system is described,
when the microphone 2 (sending sound input means according to the present invention) inputs a
voice uttered by the user as a voice transmission sound, the input voice transmitting sound is
voiced Processing is performed to generate a transmission signal, and the generated transmission
signal is output to the transmission amplifier 3.
[0023]
When a transmission signal is input from the microphone 2, the transmission amplifier 3
amplifies the input transmission signal and outputs the amplified transmission signal to the echo
canceller 4.
When an echo canceller 4 receives a transmission signal from the transmission amplifier 3, the
echo canceller 4 performs echo cancellation processing on the input transmission signal
according to the relationship with the reception signal, and transmits the echo cancellation
processed transmission signal to the transmission electronic volume 5 (this invention To the
transmission signal attenuation means).
[0024]
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When the transmission signal is input from the echo canceller 4, the transmission electronic
volume 5 attenuates the level of the input transmission signal, and the transmission signal whose
level is attenuated is not shown in the radio circuit (not shown). Output to).
Then, when a transmission signal is input from the transmission electronic volume 5, the wireless
circuit wirelessly processes the input transmission signal.
[0025]
Next, the reception system will be described. When the reception signal is input from the wireless
circuit, the reception amplifier 6 amplifies the input reception signal and outputs the amplified
reception signal to the echo canceller 4.
When the reception signal is input from the reception amplifier 6, the echo canceller 4 performs
echo cancellation processing on the input reception signal according to the relationship with the
transmission signal, and outputs the reception signal subjected to the echo cancellation
processing to the reception electronic volume 7.
[0026]
When the reception signal is input from the echo canceller 4, the reception electronic volume 7
attenuates the level of the input reception signal and attenuates the level of the reception signal,
as will be described in detail later. Means).
When the speaker 8 receives a reception signal from the reception electronic volume 7, the
speaker 8 performs voice processing on the input reception signal to generate a reception sound,
and outputs the generated reception sound.
[0027]
In the above-described configuration, the echo canceller 4 includes an adaptive filter, an adder
circuit, a ROM, and the like, and the adaptive filter, the adder circuit, and the ROM are used to
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perform echo cancellation processing on the transmission signal and the reception signal. The
acoustic echo resulting from the fact that the reception sound output from the speaker 8 is input
to the microphone 2 is canceled.
[0028]
The reception state detection circuit 9 (reception state detection means in the present invention)
is output from the echo canceller 4 and the level of the transmission signal input to the
transmission electronic volume 5, and is output from the reception amplifier 6 to the echo
canceller 4. It is detected whether or not it is in the receiving state by comparing it with the level
of the incoming signal to be input, and when it is detected that it is in the receiving state, the
echo suppression control circuit 10 (in the receiving state) is notified. Output to the control
means in the present invention.
[0029]
The volume switch 11 (listening volume setting means in the present invention) is capable of
mechanically setting the volume of the receiving sound in response to the user operating the up
switch 11a or the down switch 11b. When the up switch 11a or the down switch 11b is
operated, a volume setting command indicating a set value set according to the operation is
output to the echo suppression control circuit 10.
[0030]
When receiving the volume setting command from the volume switch 11, the echo suppressor
control circuit 10 outputs a volume control command to the receiver electronic volume 7 in
accordance with the input volume setting command.
The reception electronic volume 7 attenuates the level of the reception signal input from the
echo canceller 4 in accordance with the volume control command input from the echo
suppression control circuit 10.
With such a configuration, the user can adjust the volume of the reception sound output from the
speaker 8 by operating the volume switch 11.
[0031]
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Further, as shown in FIG. 2, the echo suppressor control circuit 10 sets a set value (volume set
value) in the volume switch 11 and an attenuation amount (echo suppressor attenuation amount)
of the transmission signal level in the transmission electronic volume 5. Holds a table in which
the volume setting command is input from the volume switch 11, the echo suppression
attenuation amount corresponding to the volume setting value indicated by the input volume
setting command is read out, and the read-out echo suppression attenuation amount is indicated
The echo suppression control command is output to the transmission electronic volume 5.
[0032]
The transmission electronic volume 5 attenuates the level of the transmission signal input from
the echo canceller 4 according to the echo suppression control command input from the echo
suppression control circuit 10.
[0033]
Here, the echo suppressor control circuit 10 sets the volume setting value in the volume switch
11 to five levels of “1” to “5”, and when the volume setting value in the volume switch 11 is
relatively large, transmission is performed. The value of the echo suppression attenuation is set
to a relatively large value so that the attenuation of the level of the speech signal is relatively
large, while when the volume setting value of the volume switch 11 is relatively small, the
transmission signal The value of the echo suppression attenuation is set to a relatively small
value so that the attenuation at the level of.
[0034]
Further, when the volume setting value in the volume switch 11 is “2” or less (less than the
predetermined level in the present invention), the echo suppressor control circuit 10 sets the
attenuation value of the transmission signal level to “0. By setting "0 dB", the level of the
transmission signal is not attenuated, that is, the echo suppression function is stopped.
Further, the echo suppressor control circuit 10 can freely change the value of the echo
suppressor attenuation amount with respect to these volume setting values.
[0035]
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Next, the operation of the above-described configuration will be described with reference to the
flowchart shown in FIG.
When the echo suppression control circuit 10 receives a volume setting command from the
volume switch 11, it determines the volume setting value indicated by the input volume setting
command (step S1).
[0036]
Here, if the volume setting value is equal to or less than the value to operate the echo
suppression function, specifically, if the volume setting value is equal to or less than “2”, the
echo suppressor control circuit 10 sets “NO” in step S2. The determination is made, and the
process returns to step S1 described above, and the volume setting value is determined again.
[0037]
On the other hand, if the volume setting value exceeds the value to operate the echo suppression
function, specifically, if the volume setting value exceeds "2", the echo suppression control circuit
10 determines "YES" in step S2. Then, it is determined whether the reception state is received or
not by determining whether the reception state notification is input from the reception state
detection circuit 9 (step S3).
[0038]
Here, the echo suppressor control circuit 10 does not receive the reception state notification
from the reception state detection circuit 9, and if it is not in the reception state, it determines
"NO" in step S3 and returns to step S1 described above. , Determine the volume setting value.
[0039]
On the other hand, the echo suppressor control circuit 10 receives the reception status
notification from the reception status detection circuit 9, and in the case of the reception status,
determines "YES" in step S3 and sets the volume setting value and the echo suppression
attenuation amount described above. And the correspondence table in correspondence with each
other (step S4), and the echo suppression attenuation amount is determined according to the
volume setting value indicated by the input volume setting command (step S5).
[0040]
Then, the echo suppressor control circuit 10 outputs an echo suppressor control command to the
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transmitter electronic volume 5, thereby attenuating the level of the transmitter signal according
to the determined amount of echo suppressor attenuation (step S6). Returning to step S1, the
same processing is repeatedly executed thereafter.
[0041]
By the way, in the configuration described above, the echo suppression attenuation amount is
changed stepwise according to the volume setting value being set stepwise, but the volume
setting value can be set continuously. If so, it is also possible to change the echo suppressor
attenuation continuously.
Further, the value of the echo suppression attenuation amount with respect to the volume setting
value may be set to be an optimum value according to an experimental value or an empirical
value.
[0042]
As described above, according to the first embodiment, when it is determined in the echo
suppressor control circuit 10 that the volume of the received sound output from the speaker 8 is
relatively large, the attenuation amount of the level of the transmission signal is compared Since
the level of the transmission signal is attenuated in the state of a large increase, the attenuation
of the level of the transmission signal is different even if the volume of the reception sound is
relatively large unlike the conventional one. The acoustic echo can be sufficiently canceled
because it is relatively large, while the attenuation of the level of the transmission signal is
relatively small when it is determined that the volume of the reception sound output from the
speaker 8 is relatively small. Since the level of the transmission signal is attenuated in the state
as described above, the volume of the reception sound is relatively small because the amount of
attenuation of the level of the transmission signal is relatively small unlike the conventional one.
Even if already there can be obviated the deterioration of feeling interruption of the speech,
which makes it possible to usability of.
[0043]
Further, when it is determined in the echo suppressor control circuit 10 that the volume of the
received sound output from the speaker 8 is less than a predetermined level, specifically, the
volume setting value is less than "2", Since the echo suppression function is stopped by setting
the attenuation amount to "0.0 dB", the acoustic echo can be generated only by activating the
echo canceller function when the volume of the received sound is extremely small. In the case
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where cancellation can be sufficiently performed, unnecessary operation of the echo suppression
function can be avoided in advance.
[0044]
Further, since the echo suppressor control circuit 10 is configured to determine the volume of
the reception sound output from the speaker 8 by determining the volume setting value
mechanically set by the volume switch 11, it is relatively easy. With this configuration, the
volume of the reception sound can be determined.
[0045]
Further, in the reception state detection circuit 9, the level of the reception signal output from
the reception amplifier 6 and input to the echo canceller 4 and the level of the transmission
signal output from the echo canceller 4 and input to the transmission electronic volume 5 Since
the comparison is made to detect whether or not it is in the receiving state, it is possible to
accurately detect whether or not it is in the receiving state by comparing the level of the
reception signal with the level of the transmission signal. Can.
[0046]
Furthermore, in the echo suppressor control circuit 10, it is possible to freely change the value of
the echo suppressor attenuation amount with respect to the volume setting value, so for example,
the echo suppressor attenuation amount is set to an optimal value according to the system
configuration. Can be flexibly dealt with, and can be expanded in usage.
[0047]
Second Embodiment Next, a second embodiment of the present invention will be described with
reference to FIGS. 4 to 6. FIG.
The same parts as those in the first embodiment described above are denoted by the same
reference numerals, and the description thereof will be omitted. Hereinafter, different parts will
be described.
In the above-described first embodiment, the echo suppressor control circuit 10 receives a
volume setting command from the volume switch 11 and determines only the volume setting
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value mechanically set by the volume switch 11, thereby outputting from the speaker 8 On the
other hand, in the second embodiment, the volume setting value mechanically set by the volume
switch 11 and the level of the reception signal are compared. Based on the relationship, the
volume of the receiving sound is estimated and calculated, and the calculation result is
determined to determine the volume of the receiving sound.
[0048]
Specifically, in the voice communication apparatus 21, when the reception volume calculation
circuit 22 (reception volume calculation means in the present invention) receives a volume
setting command from the volume switch 11, the level of the reception signal input from the
echo cancel 4 To estimate the volume of the reception sound based on the relationship between
the volume setting value indicated by the volume setting command input from the volume switch
11 and the integration result obtained by integrating the level of the reception signal input from
the echo cancellation 4 Calculation and outputting a speaker output level notification indicating
the calculation result to the echo suppressor control circuit 23 (control means in the present
invention).
[0049]
As shown in FIG. 5, the echo suppressor control circuit 23 correlates the output level (speaker
output level) at the speaker 8 with the attenuation amount (echo suppressor attenuation amount)
of the level of the transmission signal at the transmission electronic volume 5. When the speaker
output level notification is input from the reception volume calculation circuit 22, the echo
suppression attenuation amount corresponding to the speaker output level indicated by the input
speaker output level notification is read out, and the read-out echo suppression attenuation
amount is The echo suppression control command shown is output to the transmission electronic
volume 5.
[0050]
Then, the transmission electronic volume 5 attenuates the level of the transmission signal input
from the echo canceller 4 according to the echo suppression control command input from the
echo suppression control circuit 10 in the same manner as the first embodiment described
above. .
[0051]
When the volume setting instruction is input from the volume switch 11, the reception volume
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calculating circuit 22 outputs a volume control instruction to the reception electronic volume 24
in accordance with the input volume setting instruction.
Then, the reception electronic volume 24 attenuates the level of the reception signal input from
the reception volume calculation circuit 22 in accordance with the volume control command
input from the reception volume calculation circuit 22.
With such a configuration, the user can adjust the volume of the reception sound output from the
speaker 8 by operating the volume switch 11 in the same manner as the first embodiment
described above.
[0052]
Next, the operation of the above-described configuration will be described with reference to the
flowchart shown in FIG.
When the echo suppressor control circuit 23 receives the speaker output level notification from
the reception sound volume calculation circuit 22, it determines the speaker output level
indicated by the input speaker output level notification (step S11).
[0053]
Here, the echo suppressor control circuit 23 sets “NO” in step S12 if the speaker output level
is “150 dBm” or less, specifically, if the speaker output level is equal to or less than the value
to operate the echo suppressor function. It determines and returns to above-described step S11,
and determines a speaker output level again.
[0054]
On the other hand, if the speaker output level exceeds the value to operate the echo suppression
function, specifically, if the speaker output level exceeds "150 dBm", the echo suppressor control
circuit 23 determines "YES" in step S12. It is determined whether or not the reception state is
received by determining whether the reception state notification is input from the reception state
detection circuit 9 (step S13).
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[0055]
Here, the echo suppressor control circuit 23 does not receive the reception status notification
from the reception status detection circuit 9, and if it is not in the reception status, it determines
"NO" in step S13 and returns to step S11 described above. , Determine the speaker output level.
[0056]
On the other hand, the echo suppressor control circuit 23 receives the reception status
notification from the reception status detection circuit 9, and if it is in the reception status, it
determines "YES" in step S13, and the above speaker output level and echo suppression
attenuation amount And an echo suppression attenuation amount according to the speaker
output level indicated by the input speaker output level notification (step S15).
[0057]
Then, the echo suppressor control circuit 23 outputs an echo suppressor control command to the
transmitter electronic volume 5, thereby attenuating the level of the transmitter signal according
to the determined amount of echo suppressor attenuation (step S16). Returning to step S11, the
same processing is repeated from this point onward.
Also in this case, the value of the echo suppression attenuation amount with respect to the
speaker output level may be set to be an optimum value according to an experimental value or an
empirical value.
[0058]
As described above, according to the second embodiment, the same function and effect as those
of the first embodiment described above can be obtained.
In particular, in this case, the reception volume calculation circuit 22 estimates and calculates the
volume of the reception sound based on the relationship between the volume setting value
mechanically set by the volume switch 11 and the level of the reception signal, Since the volume
of the received sound output from the speaker 8 is determined by determining the calculation
result in the echo suppressor control circuit 10, compared with the one described in the first
embodiment, The accuracy can be enhanced when determining the volume.
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[0059]
(Other Embodiments) The present invention is not limited to the above-described embodiment,
and can be modified or expanded as follows.
Not limited to the configuration capable of setting the volume setting value and the speaker
output level in five levels, the volume setting value and the speaker output level may be
configured in any number of levels.
[0060]
Brief description of the drawings
[0061]
1 is a functional block diagram showing the main part of the first embodiment of the present
invention
[0062]
Fig. 2 A diagram showing the relationship between the volume setting value and the echo
suppression attenuation amount
[0063]
Fig. 3 Flowchart showing the control contents
[0064]
4 equivalent view showing a second embodiment of the present invention
[0065]
Figure 5 shows the relationship between the speaker output level and the echo suppression
attenuation
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[0066]
Figure 6 equivalent figure 3
[0067]
Explanation of sign
[0068]
In the drawing, 1 is a voice communication device, 2 is a microphone (transmission sound input
means), 4 is an echo canceller, 5 is a transmission electronic volume (transmission signal
attenuation means), 8 is a speaker (reception sound output means), 9 Is a reception state
detection circuit (reception state detection means), 10 is an echo suppressor control circuit
(control means), 11 is a volume switch (reception volume setting means), 21 is a voice
communication device, 22 is a reception volume calculation circuit (reception volume calculation
Means) and 23 are echo suppression control circuits (control means).
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