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JP2006157574

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DESCRIPTION JP2006157574
PROBLEM TO BE SOLVED: To provide an acoustic characteristic adjustment device capable of
easily adjusting acoustic characteristics of an acoustic device. SOLUTION: A signal generator 25
for generating a predetermined measurement signal to an acoustic device, a microphone 21 for
picking up a sound whose measurement signal is outputted through an equalizer 13, an amplifier
14 and a speaker 15 of the acoustic device, a microphone Whether the frequency characteristic
received from the acoustic measuring instrument falls within the standard range or not, the
acoustic measuring instrument 22 for measuring the frequency characteristic of the sound
picked up by the sound storage unit 26, the storage unit 26 in which the standard range of the
frequency characteristic and sensitivity is stored If the frequency characteristic does not fall
within the standard range, an equalizer correction parameter for correcting the equalizer
parameter is generated, and if the sensitivity is calculated from the frequency characteristic and
the sensitivity does not fall within the standard range, the amplifier parameter And an
adjustment data generation unit 23 that generates an amplifier correction parameter for
correcting the signal and transmits it to the acoustic device. [Selected figure] Figure 1
Acoustic characteristic adjustment device, acoustic characteristic adjustment method and
program
[0001]
The present invention relates to an acoustic characteristic adjustment device and an acoustic
characteristic adjustment method for adjusting acoustic characteristics of an acoustic device
equipped with a speaker or a microphone, and a program for causing a computer to execute the
method.
08-05-2019
1
[0002]
In the microphones and speakers of the telephones, frequency characteristics of transmission
and reception, and acoustic characteristics such as transmission and reception sensitivity are
standardized in order to maintain call quality.
And these acoustic characteristics can not be determined only by the characteristics of the
microphone and the speaker alone. The characteristics of the acoustic characteristics differ
depending on the shape and size of the casing and sound hole of the telephone, the mounting
position of the microphone and the speaker with respect to the casing, and the gap. Therefore,
the acoustic characteristics are measured in a state where the microphone and the speaker are
attached to the actual housing so that the standard is satisfied.
[0003]
In addition, the system which adjusts the frequency characteristic among acoustic characteristics
is disclosed (for example, refer patent document 1). JP 2001-197585 A
[0004]
According to the technique of the above-mentioned document, although the frequency
characteristic can be adjusted even after the manufacture of the telephone, there is a correlation
between the frequency characteristic and the sensitivity characteristic, and even if only one of
them is adjusted to satisfy the standard, The other may deviate from the standard. Therefore, it
takes a great deal of effort to adjust all acoustic characteristics simultaneously.
[0005]
The present invention has been made to solve the problems of the prior art as described above,
and an acoustic characteristic adjustment device and an acoustic characteristic adjustment
method capable of easily adjusting acoustic characteristics of an acoustic device, and the method
thereof An object of the present invention is to provide a program for causing a computer to
execute.
08-05-2019
2
[0006]
An acoustic characteristic adjustment device according to the present invention for achieving the
above object is an acoustic characteristic adjustment device that adjusts acoustic characteristics
including frequency characteristics and sensitivity of an acoustic device provided with an
equalizer and an amplifier that adjust sound output from a speaker. A signal generator connected
to the audio device to generate a predetermined measurement signal, a microphone to pick up
sound output from the measurement signal via the equalizer, amplifier and speaker, and a
microphone connected to the microphone An acoustic measuring instrument for measuring the
frequency characteristic of sound collected by the microphone; a storage unit storing the
frequency characteristic and a standard range of sensitivity; and the acoustic measuring
instrument and the storage unit connected to the acoustic measuring instrument To determine
whether the frequency characteristic received from the signal falls within the standard range,
and if the frequency characteristic does not fall within the standard range, the frequency
characteristic is put into the standard range. In order to correct the parameters of the equalizer,
an equalizer correction parameter is generated, and the sensitivity is calculated from the
frequency characteristic, and if the obtained sensitivity falls within the standard range, the
sensitivity is put into the standard range. And an adjustment data generation unit that generates
an amplifier correction parameter for correcting the parameter of the amplifier, and transmits
the correction parameter including information on the equalizer correction parameter and the
amplifier correction parameter to the acoustic device. .
[0007]
In the present invention, the sound output from the speaker of the acoustic device is collected by
the microphone, and the frequency characteristic is measured by the acoustic measuring
instrument.
Then, based on the measurement result, correction parameters of the equalizer and the amplifier
are generated so that the frequency characteristic and sensitivity of the acoustic device satisfy
the standard, and are supplied to the acoustic device.
[0008]
An acoustic characteristic adjustment device according to the present invention is an acoustic
characteristic adjustment device for adjusting acoustic characteristics including frequency
characteristics and sensitivity of an acoustic device including an equalizer and an amplifier for
adjusting a sound input from a microphone, An acoustic measurement that is connected to a
signal generator that generates a measurement signal through a speaker, and connected to the
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3
acoustic device, and the measurement signal measures the frequency characteristics of a signal
that is output through the microphone, amplifier, and equalizer of the acoustic device. A storage
unit in which the frequency characteristic and the standard range of sensitivity are stored, the
sound measuring unit and the storage unit are connected, and whether the frequency
characteristic received from the acoustic measuring unit falls within the standard range or not If
it is determined that the frequency characteristic does not fall within the standard range, the
equalizer parameter may be corrected to put the frequency characteristic into the standard
range. For generating a equalizer correction parameter, calculating the sensitivity from the
frequency characteristic, and adjusting the parameter of the amplifier to bring the sensitivity into
the standard range if the determined sensitivity does not fall within the standard range An
adjustment data generation unit that generates an amplifier correction parameter and transmits
the equalizer correction parameter and a correction parameter including information on the
amplifier correction parameter to the audio device.
[0009]
In the present invention, the measurement signal collected by the microphone of the acoustic
device has its frequency characteristic measured by the acoustic measuring instrument.
Then, based on the measurement result, correction parameters of the equalizer and the amplifier
are generated so that the frequency characteristic and sensitivity of the acoustic device satisfy
the standard, and are supplied to the acoustic device.
[0010]
Further, according to an acoustic characteristic adjustment device of the present invention, in an
acoustic apparatus including a side tone amplifier connected between a first microphone and a
first speaker, strength of a reference sound input to the first microphone and An acoustic
characteristic adjustment device that adjusts acoustic characteristics including a side tone
characteristic that is a ratio to the intensity of a side tone output from the first speaker, wherein
the predetermined measurement signal serving as the reference sound is a second loudspeaker A
signal generator generated via the second speaker, and the second measurement signal from the
second speaker is used to pick up a side sound output via the first microphone, a side sound
amplifier, and the first speaker. A microphone, an acoustic measurement device connected to the
second microphone to measure the intensity of the side sound picked up by the second
microphone, a storage unit in which a standard range of the side sound characteristics is stored,
Connected to a signal generator, an acoustic measuring instrument and a storage unit, The side
tone characteristic is calculated from the signal of the reference sound received from the signal
08-05-2019
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generator and the signal of the side tone received from the sound measuring instrument, and the
side tone characteristic is calculated if the obtained side tone characteristic does not fall within
the standard range. An adjustment data generation unit that generates an amplifier correction
parameter for correcting the parameter of the side tone amplifier to be in the standard range,
and transmits information of the correction parameter including the amplifier correction
parameter to the acoustic device; It is a structure.
[0011]
In the present invention, the side tone characteristic is calculated from the ratio of the strength of
the reference sound to the strength of the side tone of the audio device, and the correction
parameter of the side tone amplifier is generated so that the calculated side tone characteristic
satisfies the standard. It is supplied to the device.
[0012]
On the other hand, the acoustic characteristic adjustment method of the present invention for
achieving the above object is a method of adjusting acoustic characteristics including frequency
characteristics and sensitivity of an acoustic device provided with an equalizer and an amplifier,
wherein the frequency characteristics and sensitivity standards Preparing a range, measuring the
frequency characteristics of the acoustic device, determining whether the measured frequency
characteristics fall within the standard range, and if the frequency characteristics do not fall
within the standard range, the frequency characteristics The parameters of the equalizer are
corrected to be in the standard range, and the sensitivity is calculated from the frequency
characteristic, and if the obtained sensitivity does not fall in the standard range, the amplifier is
in order to put the sensitivity in the standard range To correct the parameters of
[0013]
Further, according to the acoustic characteristic adjustment method of the present invention, in
an acoustic device provided with a side tone amplifier connected between a microphone and a
speaker, the strength of the reference sound input to the microphone and the intensity of the
side tone output from the speaker A method of adjusting an acoustic characteristic including a
sidetone characteristic that is a ratio of a width to a height, wherein a standard range of the
sidetone characteristic is prepared, the side tone by the reference sound is measured, and the
strength of the reference sound is measured. The sidetone characteristic is calculated from the
intensity of the sidetone, and it is determined whether the determined sidetone characteristic
falls within the standard range, and if the determined sidetone characteristic does not fall within
the standard range, the sidetone characteristic is determined. To adjust the parameters of the
side tone amplifier in order to put the above in the standard range.
08-05-2019
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[0014]
Further, a program of the present invention for achieving the above object is a program for
causing a computer to execute a process of adjusting acoustic characteristics including frequency
characteristics and sensitivity of an acoustic device provided with an equalizer and an amplifier.
And the standard range of the frequency characteristic and sensitivity is stored in the computer,
and when the measured frequency characteristic of the acoustic device is input, it is determined
whether the frequency characteristic falls within the standard range, and the frequency
characteristic is determined. If it does not fall within the standard range, parameters of the
equalizer should be corrected to put the frequency response into the standard range, and the
sensitivity should be calculated from the frequency response and the obtained sensitivity should
fall within the standard range. For example, to make the computer execute a process of
correcting the parameters of the amplifier in order to bring the sensitivity into the standard
range. .
[0015]
Furthermore, the program according to the present invention is, for an acoustic device provided
with a side tone amplifier connected between a microphone and a speaker, a ratio between the
strength of the reference sound input to the microphone and the strength of the side tone output
from the speaker A program for causing a computer to execute a process of adjusting acoustic
characteristics including a sidetone characteristic, wherein a standard range of the sidetone
characteristics to be input is stored in the computer, and the measured sidetone is input Then,
the side tone characteristic is calculated from the strength of the reference sound and the side
tone, and it is determined whether the obtained side tone characteristic falls within the standard
range, and the obtained side tone characteristic is the above-mentioned side tone characteristic.
If it does not fall within the standard range, the computer is made to execute a process of
correcting the parameters of the side tone amplifier in order to put the side tone characteristic
into the standard range.
[0016]
In the present invention, with regard to an acoustic device provided with at least one of a speaker
and a microphone, the acoustic characteristic including frequency characteristics and sensitivity
can be measured in the state where the component is incorporated in the acoustic device. Even
afterward, the acoustic characteristics can be adjusted to the desired characteristics.
[0017]
The acoustic characteristic adjustment device of the present invention is characterized by
generating a correction parameter for adjusting the frequency characteristic and sensitivity of
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the acoustic device.
[0018]
The acoustic characteristic adjustment device of the present invention will be described.
In the following embodiments, the sound device is referred to as a mobile telephone, and the
mobile telephone is simply referred to as a telephone.
[0019]
The acoustic characteristic adjustment device of the present embodiment will be described.
[0020]
FIG. 1 is a block diagram showing an example of the configuration of the acoustic characteristic
adjustment device.
[0021]
As shown in FIG. 1, to the acoustic characteristic adjustment device 210, a telephone 110 to be
adjusted in acoustic characteristic is connected.
Here, the telephone 110 will be briefly described.
The configuration of the communication function including encoding and decoding of voice data
of the portable telephone and the configuration of the transmitting unit including the
microphone are the same as those of the prior art, and therefore the illustration and the detailed
description thereof will be omitted.
[0022]
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7
The telephone set 110 receives data from the switch 32 for switching signal transmission /
reception, the reception equalizer 13, the reception amplifier 14, the speaker 15, the non-volatile
memory 16 such as EEPROM, and the acoustic characteristic adjustment device 210. A (data I /
F) unit 17 and a control unit 11 that controls each unit are included.
The memory 16 stores parameter values for adjusting the reception equalizer 13 and the
reception amplifier 14, and a reference value is stored in advance.
[0023]
The telephone set 110 is provided with an adjustment mode in which the measurement signal
input from the acoustic characteristic adjustment device 210 is emitted from the speaker 15 in
order to adjust the acoustic characteristic of the incoming call.
The transition from the normal use state to the adjustment mode is designed to require a
complicated operation in order to prevent the telephone set 110 from entering the adjustment
mode accidentally by the user's operation.
For example, the keys may be pressed in the designated order, or a plurality of keys may be
pressed simultaneously.
[0024]
The changeover switch 32 is connected to a signal line 51 for transmitting and receiving a signal
to and from the outside, and a signal wire 52 for transmitting and receiving a signal to and from
the acoustic characteristic adjustment device 210.
The reception equalizer 13 is connected to the signal wiring 52 or connected to the signal line 51
by switching of the changeover switch 32 by the signal from the control unit 11.
[0025]
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When the telephone set 110 is set to the adjustment mode of the reception equalizer 13 and the
reception amplifier 14, the changeover switch 32 connects the reception equalizer 13 to the
acoustic characteristic adjustment device 210.
Then, when the reception equalizer 13 receives a signal from the acoustic characteristic
adjustment device 210 via the changeover switch 32, the reception equalizer 13 adjusts the
signal to a preset strength for each frequency and sends it to the reception amplifier 14.
The reception amplifier 14 amplifies the signal received from the reception equalizer 13 to a
preset strength and sends it to the speaker 15.
The speaker 15 outputs the sound received from the reception amplifier 14 as a sound.
[0026]
The control unit 11 includes a central processing unit (CPU) that executes predetermined
processing in accordance with a program, and a program memory for storing the program.
When an instruction to set the adjustment mode of the acoustic characteristic of the incoming
call is input, the control unit 11 switches the switch 32 to connect the incoming equalizer 13 to
the signal line 52. When the correction parameter is received from the acoustic characteristic
adjustment device 210 via the data I / F unit 17, the correction parameter is stored in the
memory 16.
[0027]
The reception equalizer 13 is a parametric equalizer, and can set gain (increase / decrease value)
and Q value (bandwidth) for each frequency. The reception equalizer 13 uses frequency, gain and
Q value as parameters. The configuration of the reception equalizer 13 is disclosed in Japanese
Patent Laid-Open No. 2001-197585, and thus the detailed description thereof is omitted here.
The receiver amplifier 14 uses the gain as a parameter.
08-05-2019
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[0028]
Next, the acoustic characteristic adjustment device 210 will be described.
[0029]
As shown in FIG. 1, the acoustic characteristic adjustment device 210 includes a microphone 21
for picking up sound emitted from the speaker 15 of the telephone 110, an audio analyzer 22 of
an acoustic measuring instrument for measuring acoustic characteristics, and an audio analyzer
22. Adjustment data generation unit 23 that generates correction parameters for adjusting the
equalizer and amplifier from the measurement results of the above, a signal generator 25 that
supplies a measurement signal to the telephone 110, and a target characteristic storage unit that
stores the target characteristic 26 and a data I / F unit 24 that transmits data to the telephone
110.
[0030]
The signal generator 25 generates signals of a plurality of types of frequencies in a frequency
range of 0.1 to 8 KHz.
The signal generator 25 is connected to the changeover switch 32 of the telephone 10 through
the signal wiring 52.
The data I / F unit 24 is connected to the data I / F unit 17 of the telephone set 110.
[0031]
When the acoustic characteristic adjustment device 210 adjusts the parameters of the reception
equalizer 13 and the reception amplifier 14 of the telephone 110, the signal generator 25
transmits the measurement signal to the reception equalizer 13 via the signal wiring 52 and the
changeover switch 32 of the telephone 110. .
[0032]
The adjustment data generation unit 23 includes a CPU that executes predetermined processing
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in accordance with a program, and a program memory for storing the program.
When receiving the measurement result of the reception frequency characteristic from the audio
analyzer 22, the adjustment data generation unit 23 determines whether the measurement result
falls within the standard range stored in the target characteristic storage unit 26. When the
measurement result falls within the standard range, the reception sensitivity is calculated by
substituting the reception frequency characteristic of the measurement result into a previously
stored calculation formula. On the other hand, when the measurement result does not fall within
the standard range, an equalizer correction parameter for correcting the parameter value of the
reception equalizer 13 so that the reception frequency characteristic falls within the standard
range is generated. The equalizer correction parameter serving as the correction parameter of
the frequency characteristic includes information on gain and Q value for each frequency. If
there is no change, the gain and the Q value match the reference values stored in advance in the
memory 16 of the telephone set 110. Subsequently, the receiver frequency characteristic is
corrected based on the equalizer correction parameter value, and the receiver sensitivity is
calculated by substituting the corrected receiver frequency characteristic into a calculation
formula stored in advance.
[0033]
Then, the adjustment data generation unit 23 determines whether the calculated reception
sensitivity falls within the standard range stored in the target characteristic storage unit 26. If
the calculated reception sensitivity does not fall within the standard range, an amplifier
correction parameter is generated to correct the parameter value of the reception amplifier 14 so
that the reception sensitivity falls within the specification range. The amplifier correction
parameter as the correction parameter of the sensitivity characteristic includes information of
gain. The gain is a value that matches a reference value stored in advance in the memory 16 of
the telephone 110 if there is no change.
[0034]
Subsequently, when the calculated reception sensitivity falls within the standard range, a
simulation for confirming the influence of the amplifier correction parameter on the reception
frequency response is performed to obtain the reception frequency response again, and whether
the reception frequency characteristic falls within the standard range Determine If the reception
frequency characteristic deviates from the standard range according to the simulation result, the
08-05-2019
11
equalizer correction parameter is redetermined, the reception frequency characteristic is
corrected with the newly obtained equalizer correction parameter, and the reception sensitivity is
recalculated. On the other hand, when the receiving frequency characteristic falls within the
standard range according to the simulation result, correction parameters including the equalizer
correction parameter and the amplifier correction parameter are transmitted to the telephone
110 through the data I / F unit 24.
[0035]
Next, the information of the standard range stored in the target characteristic storage unit 26 will
be described. In this embodiment, an acoustic standard according to the 3rd Generation
Perception Project (3GPP) is used.
[0036]
FIG. 2A is a graph showing the upper limit value and the lower limit value of the standard range
of the receiving frequency characteristic. The horizontal axis indicates frequency, and the vertical
axis indicates sound intensity. If the sound picked up by the microphone 21 is between the upper
limit value (solid line) and the lower limit value (broken line) of the graph for each frequency, the
reception frequency characteristic falls within the standard range.
[0037]
FIG. 2B shows three standard ranges of the reception sensitivity RLR (Receive Loudness Rating).
In each case, when the user-operable volume is set to the normal use state, the maximum value is
set, and the minimum value is set.
[0038]
FIG. 3 is a formula for calculating the sensitivity LR (Loudness Rating) defined in the 3GPP
standard. Wi is a weighting factor, and is different for each reception and transmission, and
different for each frequency. The value of Wi is determined by the standard. m is a constant. In
the present embodiment, the sensitivity LR is determined for the range of the measured
08-05-2019
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frequency. When the reception sensitivity RLR is determined, N1 is the minimum frequency of
the measured reception frequency characteristic, and N2 is the maximum frequency of the
measured reception frequency measurement. Si (i = N1 to N2) is a receiving frequency
characteristic value measured for each frequency. The reception sensitivity RLR is obtained by
substituting the values of Si and Wi corresponding to the frequencies N1 to N2 in the calculation
formula shown in FIG.
[0039]
According to the 3GPP acoustic standard, at the time of measurement of acoustic characteristics,
the telephone 110 and the microphone 21 are installed according to 3GPP TS26.132, and the
measurement signal according to the standard is supplied from the signal generator 25 to the
telephone 110.
[0040]
Next, a method of adjusting the acoustic characteristic of the incoming call by the acoustic
characteristic adjusting device 120 configured as described above will be described.
[0041]
FIG. 4 is a flow chart showing the operation procedure of the acoustic characteristic adjustment
device.
[0042]
The user operates the telephone set 110 to place the telephone set 110 in the adjustment mode
of the acoustic characteristic of the incoming call.
The user operates the acoustic characteristic adjustment device 210 to cause the signal
generator 25 to generate a measurement signal of a level defined by the acoustic standard.
When the measurement signal from the signal generator 25 is input to the reception equalizer
13 via the changeover switch 32, the telephone 110 emits the measurement signal from the
speaker 15 via the reception amplifier 14.
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13
[0043]
When the microphone 21 picks up the sound emitted from the speaker 15 (step 101), it supplies
the sound to the audio analyzer 22.
The audio analyzer 22 measures the receiving frequency characteristic of the supplied sound
(step 102). Subsequently, the measurement result is sent to the adjustment data generation unit
23.
[0044]
The adjustment data generation unit 23 compares the graph of FIG. 2A stored in the target
characteristic storage unit 26 with the measurement result, and determines whether the
measurement result falls within the standard range between the upper limit value and the lower
limit value. (Step 103). If the measurement result does not fall within the standard range, an
equalizer correction parameter is generated to make the receiving frequency characteristic fall
within the standard range (step 104). If the measurement result falls within the standard range in
step 103, the adjustment data generation unit 23 proceeds to step 105 without generating the
equalizer correction parameter.
[0045]
Subsequently, the adjustment data generation unit 23 calculates the reception sensitivity
according to the calculation formula shown in FIG. 3 based on the reception frequency
characteristic corrected by the equalizer correction parameter (step 105), and the calculated
reception sensitivity falls within the standard range. It is determined whether or not it enters
(step 106). If the calculated reception sensitivity does not fall within the standard range, an
amplifier correction parameter is generated so that the reception sensitivity falls within the
specification range (step 107). If the reception sensitivity falls within the standard range in step
106, the adjustment data generation unit 23 proceeds to step 108 without generating the
amplifier correction parameter.
[0046]
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14
Thereafter, a simulation for examining the influence of the amplifier correction parameter on the
receiving frequency characteristic is performed to determine whether the receiving frequency
characteristic by simulation falls within the standard range (step 108). If the receiving frequency
characteristic falls within the standard range, the adjustment is finished, and the information of
the correction parameter is transmitted to the telephone 110 through the data I / F unit 24 (step
109). When the telephone set 110 receives the correction parameter from the acoustic
characteristic adjustment device 210 via the data I / F unit 17, the control unit 11 stores the
correction parameter in the memory 16. If the reception frequency characteristic deviates from
the standard range in step 108, the measurement of the reception frequency characteristic in
step 102 is performed again in order to adjust the telephone 110 again.
[0047]
In the present invention, as described above, the sound output from the speaker 15 of the
telephone 110 is collected by the microphone 21 and the audio analyzer 22 measures the
reception frequency characteristic. Then, based on the measurement result, correction
parameters of the reception equalizer 13 and the reception amplifier 14 are generated so that
the reception frequency characteristic and reception sensitivity of the telephone 110 satisfy the
standard, and supplied to the telephone 110. Therefore, even after the manufacture of the
telephone set 110, it is possible to adjust the reception equalizer 13 and the reception amplifier
14 so that not only the reception frequency characteristic but also the reception sensitivity
characteristic falls within the standard range.
[0048]
The generation of the correction parameter in the adjustment data generation unit 23 is not
limited to one time, and may be repeated a plurality of times. Also, after the generated correction
parameter is once transmitted to the telephone 110 and stored by the telephone 110, the
correction parameter may be calculated again. Further, although the amplifier correction
parameter is generated after the equalizer correction parameter is generated in the present
embodiment, the equalizer correction parameter may be generated after the amplifier correction
parameter is generated first. Also, the reception frequency characteristic and the correction
parameter of the reception sensitivity characteristic may be generated in parallel.
[0049]
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15
Furthermore, the generation of the correction parameter in the adjustment data generation unit
23 is not limited to the method of the present embodiment and may be another method as long
as a specific frequency or frequency band can be arbitrarily targeted. .
[0050]
While the first embodiment is for adjusting the acoustic characteristics of the reception of the
telephone, this embodiment is for adjusting the acoustic characteristics of the transmission of the
telephone.
[0051]
The configuration of the acoustic characteristic adjustment device 220 of this embodiment will
be described.
The same components as those of the first embodiment are denoted by the same reference
numerals, and the detailed description thereof is omitted.
Further, since the general communication function of the telephone and the configuration of the
receiving unit including the speaker are the same as those in the prior art, the illustration in the
figure and the detailed description thereof will be omitted.
[0052]
FIG. 5 is a block diagram showing an example of the configuration of the acoustic characteristic
adjustment apparatus of the present embodiment.
[0053]
As shown in FIG. 5, the telephone 120 connected to the acoustic characteristic adjustment device
220 includes the microphone 12 in addition to the changeover switch 32, the data I / F unit 17,
the memory 16 and the control unit 11 shown in the first embodiment. , A transmission amplifier
19 and a transmission equalizer 18.
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The memory 16 stores parameter values for adjusting the transmission equalizer 18 and the
transmission amplifier 19, and a reference value is stored in advance.
[0054]
The telephone set 120 is provided with an adjustment mode for adjusting the acoustic
characteristics of transmission as in the case of adjusting the acoustic characteristics of
reception.
[0055]
The changeover switch 32 is connected to a signal line 51 for transmitting and receiving a signal
to and from the outside, and a signal wiring 53 for transmitting and receiving a signal to and
from the acoustic characteristic adjustment device 220.
The transmission equalizer 18 is connected to the signal wiring 53 or connected to the signal line
51 by the changeover switch 32 being switched by the signal from the control unit 11.
[0056]
When the telephone set 120 is set to the adjustment mode of the transmission equalizer 18 and
the transmission amplifier 19, the changeover switch 32 connects the transmission equalizer 18
to the acoustic characteristic adjustment device 220. Then, the transmission amplifier 19
amplifies the sound picked up by the microphone 12 to a preset strength, and sends the signal to
the transmission equalizer 18. The transmission equalizer 18 adjusts the signal received from the
transmission amplifier 19 to a preset strength for each frequency, and transmits the signal to the
acoustic characteristic adjustment device 220 via the changeover switch 32.
[0057]
The transmission equalizer 18 is a parametric equalizer as the reception equalizer 13 is. The
transmission amplifier 19 has the same configuration as the reception amplifier 14.
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[0058]
When an instruction to set the adjustment mode of the acoustic characteristic of transmission is
input, the control unit 11 switches the switch 32 to switch the transmission equalizer 18 to the
signal wiring 53.
[0059]
Next, the acoustic characteristic adjustment device 220 will be described.
[0060]
As shown in FIG. 5, in the acoustic characteristic adjustment device 220, a speaker 27 is
connected to the signal generator 25 instead of the microphone 21 as compared with the
configuration shown in the first embodiment.
Further, the target characteristic storage unit 26 stores information of a standard range
regarding the acoustic characteristic of transmission.
The audio analyzer 22 is connected to the changeover switch 32 of the telephone 120 through
the signal wiring 53. The adjustment data generation unit 23 generates a correction parameter
for adjusting the transmission equalizer 18 and the transmission amplifier 19 from the
measurement result of the audio analyzer 22.
[0061]
When the acoustic characteristic adjustment device 220 adjusts the parameters of the
transmission equalizer 18 and transmission amplifier 19 of the telephone 120, the measurement
received by the audio analyzer 22 from the transmission equalizer 18 of the telephone 120
through the changeover switch 32 and the signal wiring 53 Measure the frequency
characteristics of the signal.
[0062]
The adjustment data generation unit 23 generates an equalizer correction parameter if the
transmission frequency characteristic received from the audio analyzer 22 does not fall within
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the standard range, as in the adjustment method of the acoustic characteristic in the case of the
reception.
Further, the measured transmission frequency characteristic is substituted into the formula
shown in FIG. 3 to obtain the transmission sensitivity, and if the calculated transmission
sensitivity does not fall within the standard range, an amplifier correction parameter is
generated.
[0063]
Subsequently, the information of the standard range stored in the target characteristic storage
unit 26 will be described. As in the first embodiment, the sound standard according to 3GPP is
used.
[0064]
FIG. 6A is a graph showing the upper limit value and the lower limit value of the standard range
of the transmission frequency characteristic. The horizontal axis indicates frequency, and the
vertical axis indicates sound intensity. If the signal input from the telephone set 120 to the audio
analyzer 22 is between the upper limit (solid line) and the lower limit (broken line) of the graph
for each frequency, the transmission frequency characteristic will fall within the standard range.
[0065]
FIG. 6B shows the standard range of the sending sensitivity SLR (Sending Loudness Rating). The
transmission sensitivity SLR is determined as follows, as in the case of determining the reception
sensitivity. In the formula shown in FIG. 3, the minimum frequency and the maximum frequency
of the measured transmission frequency characteristics are N1 and N2, respectively, and the
transmission frequency characteristic values measured for each frequency are Si (i = N1 to N2).
Then, the transmission sensitivity SLR can be obtained by substituting the values of Si and Wi in
correspondence with the frequencies N1 to N2.
[0066]
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Next, a method of adjusting the acoustic characteristics of transmission will be described.
[0067]
FIG. 7 is a flow chart showing the operation procedure of the acoustic characteristic adjustment
device.
[0068]
The user operates the telephone set 120 to place the telephone set 120 in the transmission
characteristic adjustment mode.
The user operates the acoustic characteristic adjustment device 220 to cause the signal
generator 25 to generate a measurement signal of a level defined by the acoustic standard and
emit sound from the speaker 27 (step 201).
The telephone 120 picks up the sound emitted from the speaker 27 with the microphone 12 and
converts it into a signal, and converts the converted signal through the transmission amplifier 19
and the transmission equalizer 18 via the changeover switch 32 and the acoustic characteristics.
It transmits to the audio analyzer 22 of the adjustment device 220. The audio analyzer 22
measures the transmission frequency characteristics of the signal received from the telephone
120 (step 202). Subsequently, the measurement result is sent to the adjustment data generation
unit 23.
[0069]
The adjustment data generation unit 23 compares the graph of FIG. 6A stored in the target
characteristic storage unit 26 with the measurement result, and determines whether the
measurement result falls within the standard range (step 203). If the measurement result does
not fall within the standard range, an equalizer correction parameter is generated to make the
transmission frequency characteristic fall within the standard range (step 204). If the
measurement result falls within the standard range in step 203, the adjustment data generation
unit 23 proceeds to step 205 without generating the equalizer correction parameter.
08-05-2019
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[0070]
Subsequently, the adjustment data generation unit 23 calculates the transmission sensitivity
according to the formula shown in FIG. 3 based on the transmission frequency characteristic
corrected by the equalizer correction parameter (step 205), and the calculated transmission
sensitivity It is determined whether it falls within the standard range (step 206). If the calculated
transmission sensitivity does not fall within the standard range, an amplifier correction
parameter for generating the transmission sensitivity within the standard range is generated
(step 207). When the transmission sensitivity falls within the standard range in step 206, the
adjustment data generation unit 23 proceeds to step 208 without generating the amplifier
correction parameter.
[0071]
Thereafter, a simulation for examining the influence of the amplifier correction parameter on the
transmission frequency characteristic is performed to determine whether the transmission
frequency characteristic by simulation falls within the standard range (step 208). If the
transmission frequency characteristic falls within the standard range, the adjustment is ended,
and the information of the correction parameter is transmitted to the telephone 120 through the
data I / F unit 24 (step 209). When the telephone set 120 receives the correction parameter from
the acoustic characteristic adjustment device 220 via the data I / F unit 17, the control unit 11
stores the correction parameter in the memory 16. If the transmission frequency characteristic
deviates from the standard range in step 208, the measurement of the transmission frequency
characteristic in step 202 is performed again to adjust the telephone 120 again.
[0072]
In the present embodiment, as described above, the measurement signal collected by the
microphone 12 of the telephone 120 is subjected to the transmission frequency characteristic
measurement by the audio analyzer 22. Then, based on the measurement result, correction
parameters of the transmission equalizer 18 and the transmission amplifier 19 are generated so
that the transmission frequency characteristic and transmission sensitivity of the telephone 120
satisfy the standard, and are supplied to the telephone 120. Therefore, even after the
manufacture of the telephone set 120, it is possible to adjust the transmission equalizer 18 and
the transmission amplifier 19 so that not only the transmission frequency characteristic but also
the transmission sensitivity characteristic falls within the standard range.
08-05-2019
21
[0073]
Also in this embodiment, as in the first embodiment, the adjustment may be repeatedly
performed, and the adjustment may be made earlier in the transmission sensitivity. Further, the
generation of the correction parameter in the adjustment data generation unit 23 is not limited
to the method of the present embodiment and may be another method as long as a specific
frequency or frequency band can be arbitrarily targeted. .
[0074]
In this embodiment, the characteristic of the side tone in which the voice from the mouthpiece of
the telephone is fed back to the earpiece is adjusted. The side tone is thus output in order to
prevent the user of the telephone from hearing his or her voice by blocking the ear with the
handset, thereby preventing the voice from becoming large. Hereinafter, the ratio of the strength
of the reference sound to the strength of the side sound output from the speaker as the sound
input from the microphone will be referred to as a side sound characteristic.
[0075]
The acoustic characteristic adjustment device of the present embodiment will be described.
[0076]
FIG. 8 is a block diagram showing an example of the configuration of the acoustic characteristic
adjustment device of this embodiment.
In addition, about the structure similar to Example 1 or Example 2, the same code | symbol is
attached | subjected and the detailed description is abbreviate | omitted. Also, since the general
communication function of the telephone and the general configuration of the transmitter and
receiver are the same as in the prior art, the illustration in the drawings and the detailed
description thereof will be omitted.
08-05-2019
22
[0077]
As shown in FIG. 8, the telephone set 130 connected to the acoustic characteristic adjustment
device 230 includes the changeover switch 32, the data I / F unit 17, the memory 16 and the
speaker 15 shown in the first and second embodiments. A changeover switch 34 and a side tone
amplifier 30 connected to the microphone 12 and the speaker 15 are provided. The memory 16
stores parameter values for adjusting the side tone amplifier 30, and a reference value is stored
in advance.
[0078]
The telephone set 130 is provided with an adjustment mode for adjusting the side tone
characteristics as in the case of the acoustic characteristics of the incoming and outgoing calls.
[0079]
The changeover switch 32 switches whether to connect the microphone 12 to a signal line 51 for
transmitting the sound collected by the microphone 12 to the outside.
The changeover switch 34 switches whether to connect the speaker 15 to a signal line 54 for
receiving an external signal to output to the speaker 15.
[0080]
The side tone amplifier 30 causes the speaker 15 to output a predetermined ratio of the sound
input by the microphone 12. This ratio is a gain, which is a parameter of the side tone amplifier
30.
[0081]
When the telephone set 130 is set to the adjustment mode of the side tone characteristic, the
changeover switch 32 switches the switch to a state in which the microphone 12 is not
connected to the signal line 51 according to a signal from the control unit 11. Further, the switch
08-05-2019
23
34 is switched to a state in which the speaker 15 is not connected to the signal line 54 by a
signal from the control unit 11. Then, the signal of the sound collected by the microphone 12 is
amplified by the side tone amplifier 30 and then sent to the speaker 15. The speaker 15 outputs
the signal received from the side tone amplifier 30 as sound.
[0082]
When an instruction to set to the adjustment mode of the side tone characteristic is input, the
control unit 11 switches the microphone 12 to the state not to connect the signal line 51 to the
changeover switch 32 and does not connect the speaker 15 to the signal line 54 The changeover
switch 34 is switched to the state.
[0083]
Next, the acoustic characteristic adjustment device 230 will be described.
[0084]
As shown in FIG. 8, in the configuration shown in the second embodiment, the audio
characteristic adjustment device 20 has the audio analyzer 22 connected to the microphone 21
and the connection with the telephone set 130 disconnected.
The microphone 21 picks up a side sound output from the speaker 15 of the telephone set 130.
The target characteristic storage unit 26 stores information of a standard range regarding the
sidetone characteristic. Assuming that the intensity of the reference tone is Im and the intensity
of the sidetone is If, STMR (Side Tone Masking Rating), which is an evaluation scale as a side tone
characteristic, can be expressed as STMR = constant × log (Im / If) I will ask. In the 3GPP
acoustic standard, the standard range of STMR is STMR = 18 ± 5 dB. In the present embodiment,
the sound output from the signal generator 25 through the speaker 27 is a reference.
Hereinafter, the reference sound is referred to as a reference sound.
[0085]
The adjustment data generation unit 23 calculates the side tone characteristic from the signal of
the reference sound received from the signal generator 25 and the signal of the side tone
received from the audio analyzer 22, and if the side tone characteristic does not fall within the
08-05-2019
24
standard range, An amplifier correction parameter is generated to correct the parameter of the
side tone amplifier 30 so that the sound characteristic falls within the standard range.
[0086]
Next, the adjustment method of the side tone characteristic will be described.
[0087]
FIG. 9 is a flowchart showing the operation procedure of the acoustic characteristic adjustment
device.
[0088]
The user operates the telephone set 130 to place the telephone set 130 in the sidetone
characteristic adjustment mode.
When the telephone set 130 is in the adjustment mode of the side tone characteristic, the control
unit 11 sets the signal of the sound collected by the microphone 12 to be output to the speaker
15 through the side tone amplifier 30.
The user operates the acoustic characteristic adjustment device 230 to cause the signal
generator 25 to generate a measurement signal of a level defined by the acoustic standard and
emit sound from the speaker 27 (step 301).
The telephone 130 picks up the sound emitted from the speaker 27 with the microphone 12 and
converts it into a signal, and the converted signal is output to the side sound amplifier 30 from
the speaker 15 via the side sound amplifier 30. The acoustic characteristic adjustment device
230 picks up the side sound output from the speaker 15 with the microphone 21 (step 302).
[0089]
When the side signal picked up by the microphone 21 is input, the audio analyzer 22 converts it
into a signal for calculation and sends it to the adjustment data generation unit 23. The
08-05-2019
25
adjustment data generation unit 23 calculates a side tone characteristic from the side tone signal
received from the audio analyzer 22 and the reference tone signal received from the signal
generator 25 (step 303). Then, the calculated sidetone characteristic is compared with the
standard range stored in the target characteristic storage unit 26 to determine whether the
calculated sidetone characteristic falls within the standard range (step 304). If the calculated
sidetone characteristic does not fall within the standard range, an amplifier correction parameter
is generated to make the sidetone characteristic fall within the standard range (step 305). If the
sidetone characteristic falls within the standard range in step 304, the adjustment data
generation unit 23 proceeds to step 306 without generating the amplifier correction parameter.
In this case, the amplifier correction parameter has a value that matches the reference value
stored in the memory 16 of the telephone 130.
[0090]
After that, it is confirmed by simulation whether the sidetone characteristic falls within the
standard range with the value of the determined amplifier correction parameter (step 306). If the
side tone characteristic falls within the standard range, the adjustment is ended, and information
on the correction parameter including the amplifier correction parameter is transmitted to the
telephone 130 via the data I / F unit 24 (step 307). When the telephone set 130 receives the
correction parameter from the acoustic characteristic adjustment device 230 via the data I / F
unit 17, the control unit 11 stores the correction parameter in the memory 16. If the result of the
simulation deviates from the standard range in step 306, the calculation of the sidetone
characteristic in step 303 is performed again to adjust the telephone 130 again.
[0091]
In this embodiment, as described above, the side tone characteristic is calculated from the ratio
of the strength of the reference sound to the strength of the side tone of the telephone 130, and
the side tone characteristic of the side tone amplifier 30 is satisfied so that the calculated side
tone characteristics satisfy the standard. Correction parameters are generated and provided to
the telephone 130. Therefore, even after the manufacture of the telephone set 130, the
parameters of the side tone amplifier 30 can be corrected to adjust the side tone characteristics.
Also in the adjustment method of the sidetone characteristic, it is possible to perform adjustment
repeatedly as in the first and second embodiments.
[0092]
08-05-2019
26
The acoustic characteristic adjustment apparatus and the acoustic characteristic adjustment
method according to the present invention are not limited to the above-described first to third
embodiments, and any two of these embodiments may be combined, and The three embodiments
may be combined. The acoustic characteristic adjustment method in the above-described
embodiment may be applied to a program for causing a computer to execute.
[0093]
In the first and second embodiments, the sensitivity LR is determined for the measured frequency
range, but the measured frequency range is divided to determine the sensitivity LR for each
divided range. May be Then, if the sensitivity LR is different for each divided range, the
sensitivity characteristic may be adjusted by correcting the equalizer gain for each frequency
instead of the amplifier.
[0094]
Furthermore, although the above-described embodiment has been described in the case of the
telephone including the mobile telephone, the sound device is not limited to the telephone, and
may be a television, a stereo, a hearing aid, a loudspeaker, or the like.
[0095]
FIG. 1 is a block diagram showing a configuration example of an acoustic characteristic
adjustment device of a first embodiment.
It is a graph and a value which show the specification of a receiving frequency characteristic and
a receiving sensitivity. It is a formula for calculating the sensitivity. It is a flowchart which shows
the adjustment procedure of the acoustic characteristic of an incoming call. FIG. 7 is a block
diagram showing an example of the configuration of an acoustic characteristic adjustment device
according to a second embodiment. It is a graph and value which show the specification of
transmitting frequency characteristic and transmitting sensitivity. It is a flowchart which shows
the adjustment procedure of the acoustic characteristic of transmission. FIG. 13 is a block
diagram showing an example of the configuration of an acoustic characteristic adjustment device
according to a third embodiment. It is a flowchart which shows the adjustment procedure of the
08-05-2019
27
acoustic characteristic of a side sound.
Explanation of sign
[0096]
DESCRIPTION OF SYMBOLS 110, 120, 130 Telephone 11 Control section 12 Microphone 13
Reception equalizer 14 Reception amplifier 15 Speaker 16 Memory 17 Data interface section 18
Transmission equalizer 19 Transmission amplifier 210, 220, 230 Acoustic characteristic
adjustment device 21 Microphone 22 Audio analyzer 23 Adjustment data Generation unit 24
Data interface unit 25 Signal generator 26 Target characteristic storage unit 27 Speaker 30 Side
sound amplifier 32, 34 selector switch
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