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JP2007110481

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DESCRIPTION JP2007110481
[PROBLEMS] To provide a voice control device and a correction device for correcting a voice of a
navigation unit and a music piece of an audio device outputted in a vehicle accompanied by
movement of a vehicle or a train to a clear sound. It will be an issue. A voice control apparatus
(1) according to the present invention includes an audio source (2), a navigation unit (3)
providing map information and route guidance information, a DSP / bus / treble circuit (4) for
correcting reproduced sound, voice A microcomputer 5 for controlling the entire control device
1, a volume circuit 6 for adjusting the volume, a speaker drive circuit 8 connected to the speaker
7 for outputting sound and controlling the drive of the speaker 7, noise in the vehicle A noise
detection microphone 13 for collecting sound, a crank position sensor 14 for detecting a pulse
signal, and a vibration sensor 15 for detecting a vibration state of a vehicle are provided.
[Selected figure] Figure 1
Voice control device, correction device
[0001]
The present invention relates to a technology for correcting the output level of audio / music
output from an audio output device mounted on a vehicle according to the traveling noise of the
vehicle.
[0002]
In recent years, the widespread use of car navigation devices installed in automobiles to provide
road guidance, destination information and the like, and car audio devices outputting music
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1
recorded on a medium such as a CD, MD, or HDD is remarkable.
Along with this, these devices have come to be standard equipment in vehicles, and many users
(drivers and passengers) are enjoying music in the vehicles and searching for a route to a
destination.
[0003]
However, when the vehicle is driven, road noise is generated due to the friction between the tire
and the road surface. Especially when traveling on a bad road, road noise has become large,
making it difficult to hear sounds and music.
[0004]
In order to solve such problems, a device has been invented that performs control to provide a
microphone in a car, collect noise from the microphone, and increase the volume of voice and
music according to the magnitude of the noise. . For example, Patent Document 1 is an invention
of a car navigation device that raises the pitch of navigation voice according to vehicle speed,
Patent Document 2 is an acoustic correction system that corrects high and low frequencies
according to vehicle speed and tone level, The invention of an acoustic correction program, an
acoustic correction method, and an acoustic correction device is disclosed. Patent Document 3 is
an invention of a voice correction device that raises the output of bass as the vehicle speed
increases. The present invention is an invention of an audio signal processing apparatus which
divides 200 Hz or less, compresses the 200 Hz or less according to the vehicle speed, adds them,
and outputs them.
[0005]
According to these inventions, the output volume can be set high as the vehicle speed increases,
so that it is possible to prevent the voice and the music from being inaudible due to noise. JP-A11-281388 JP-A-2004-228937 JP-A-6-85581 JP-A-3373103
[0006]
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2
By the way, as described above, the prior art is based on the technical idea that the volume of the
sound or music output from the car navigation device or the car audio device is larger than the
volume of the road noise.
[0007]
However, raising the volume of the voice or music sometimes generates a frequency band that
makes it difficult to hear.
For example, when the vehicle is traveling at high speed, it is difficult to hear the frequency near
the high frequency range, and when traveling at low speed, it is difficult to hear the frequency
near the low frequency range.
[0008]
Furthermore, depending on the noise type (noise frequency) / magnitude, as shown in FIG. 6, if
the low frequency of the voice or music is increased so as to be equal to the noise size (see A in
FIG. 6). ), The frequency band of the voice (vocal) of the person included in the music sometimes
became difficult to hear.
[0009]
Therefore, the present invention provides a voice control device and a correction device for
correcting the voice of a car navigation device and the music of a car audio device, which are
output in a vehicle accompanied by movement of a vehicle or a train, to a clear sound. As an
issue.
[0010]
The present invention has been made in view of the above-mentioned matters, that is, the present
invention is mounted on a vehicle, and a reproduction means for reproducing sound data, a
speaker for outputting sound data reproduced by the reproduction means, and output from the
speaker The noise component of the sound data reproduced by the reproduction means is within
a predetermined range based on the noise detection means for detecting the traveling noise
generated along with the traveling of the vehicle other than the sound data and the result
detected by the noise detection means The correction means is characterized by lowering the
level of the frequency component of the sound data reproduced by the reproduction means in
the same frequency band as the frequency band of the traveling noise.
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[0011]
The reproduction means of the present invention includes an audio reproduction unit (including
a car-mounted car audio apparatus) for reproducing music data recorded in a recording medium,
a navigation unit for guiding the traveling of the vehicle, or a reception means. For example, a
receiver that outputs a voiced sound can be mentioned.
The audio device and the navigation unit can reproduce music and voice sound data recorded on
a recording medium such as a DVD (Digital Versatile Disk), a CD (Compact Disk), and an MD
(Mini Disk).
Sound data reproduced by these devices is output from a speaker provided in the vehicle.
Thus, a driver or a passenger of a vehicle can view music in the vehicle or use a road guidance
function by voice.
[0012]
However, as the vehicle travels, noise such as road noise caused by engine noise and friction
between the tire and the road surface (hereinafter referred to as travel noise) is generated, and
the driver and the passenger can In some cases, it may be difficult to hear the output music or
voice guidance. This means that the sound intensity level (dB) of some of the frequency
components of engine noise and road noise is raised to the same level as the frequency
components of music and voice output from the speaker It is for.
[0013]
Therefore, the correction means of the present invention corrects the level of the frequency
component of the sound data reproduced by the reproduction means to approach the level of the
frequency component of the traveling noise. At this time, the correction means corrects the level
of the frequency component of the sound data within a predetermined range of the traveling
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noise, for example, within the low band. A range of 200 Hz or less can be exemplified as the
range of the low band here.
[0014]
Since the output level of the traveling noise in the low band of the traveling noise and the output
level of the low band in the sound data become close to each other by the correction within the
predetermined range by the correcting means, the output of the traveling noise becomes
inconspicuous. In addition, since the frequency band of human voice is 100 Hz to 4 kHz, by not
changing (lowering) the level of the frequency component in the frequency band of this range,
noise of running human voice in sound data (music, voice) It can be more prominent.
[0015]
Furthermore, by bringing the level of the frequency component of the sound data of music or
voice guidance closer to the level of the frequency component of the traveling noise, the level of
the frequency band of the human voice of music or voice guidance is relatively increased. . This
makes it easy for the driver or passenger to hear vocals and voice guidance during music while
the vehicle is traveling. The present invention can be suitably used for ships, airplanes and the
like in addition to vehicles such as cars and trains.
[0016]
Also, in view of the overall level except for the temporary level increase, it is considered that the
level of the traveling noise (dB) is lower than the level of human voice in the sound data of music
and voice guidance. That is, the correction means according to the present invention executes
correction to reduce the level of the frequency component in the sound data in the same band as
the frequency band of the traveling noise to the level of the frequency component of the
traveling noise. Then, as a result, frequency components in the frequency band of human voice
will stand out.
[0017]
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As a result, the driver of the vehicle or the passenger can enjoy the music even in the vehicle in
which the traveling noise occurs, and can clearly hear the voice such as the route guidance and
the traffic information. The present invention is not limited to music / voice recorded on media
such as CD, MD, and DVD, but may be AM / FM radio.
[0018]
Further, the noise detection means according to the present invention can predict noise based on
a pulse signal generated as the vehicle travels. At this time, it is preferable that the correction
means according to the present invention correct the level of the frequency component of the
sound in accordance with at least one of the traveling speed and the acceleration of the vehicle
calculated from the pulse signal.
[0019]
For example, a crank position sensor can be suitably used as noise detection means. When the
crank position sensor as noise detection means detects a pulse signal and the speed of the
vehicle is calculated to be 80 km / hour from the pulse signal, the correction means determines
that the traveling noise is larger than when the vehicle speed is 40 km / hour. Then, correction is
performed to reduce the level of the frequency component of the sound data of the music / voice
guidance of the band corresponding to the frequency band of the traveling noise.
[0020]
Thus, according to the present invention, it is possible to predict each frequency component level
(output level) of traveling noise according to the vehicle speed and acceleration, and according to
the level of the frequency component of traveling noise, the music / voice frequency Component
level correction can be performed.
[0021]
Further, the noise detection means according to the present invention can be a microphone
attached near the reproduction means to collect traveling noise.
[0022]
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By installing a microphone, noise in the vehicle can be directly measured.
Therefore, it is possible to collect noise as close as possible to the noise actually heard by the
driver or the passenger in the vehicle.
[0023]
Thereby, the correction means can perform more suitable correction, and the driver and the
passenger can hear the music / voice guidance more clearly.
[0024]
Further, the noise detection means according to the present invention may be provided as a
vibration measurement means which is provided in a vehicle and measures the magnitude of the
vibration of the vehicle.
For example, a vibration sensor is mounted in a vehicle, and the correction means estimates the
magnitude of road noise generated due to the friction between the tire and the road surface
based on the detection result from the vibration sensor, and the frequency component of music /
voice guidance Make level corrections.
[0025]
As a result, even when the vehicle travels on a rough road surface such as a gravel road or a
mountain road, it is possible to prevent as much as possible from making it difficult to hear
music and voice guidance due to traveling noise.
[0026]
Further, the present invention is a correction device attached to an audio output device mounted
in a vehicle, for correcting sound data reproduced by reproduction processing of the audio
output device, which is outputted from a speaker provided in the audio output device Based on
the noise detection means for detecting the running noise associated with the running of the
vehicle other than the sound data and the result detected by the noise detection means, the
frequency component of the sound data output by the audio output device is corrected within a
predetermined range And correction means for
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[0027]
That is, the correction device of the present invention can be separated from the audio device
and the navigation device.
According to the present invention, the present invention can be generally used for existing audio
devices and car navigation devices.
[0028]
According to the present invention, it is possible to provide a voice control device and a
correction device for correcting the voice of a car navigation device and the music of an audio
device, which are output in a vehicle accompanied by movement such as a car or a train, into
clear sound. It becomes possible.
[0029]
Hereinafter, the voice control device and the correction device of the present invention will be
described in detail with reference to the drawings.
In addition, although the vehicle in this embodiment is demonstrated as a motor vehicle, the
application of this invention is not limited to this.
[0030]
First, the voice control device of the present embodiment will be described.
[0031]
As shown in FIG. 1, the audio control device 1 of the present embodiment outputs music and
sound recorded on a recording medium such as a DVD (Digital Versatile Disk), a CD (Compact
Disk), an MD (Mini Disk) and the like. An audio source (reproduction means) 2 comprising each
reproduction means, each reception means for outputting sound data of voice and music received
by a radio reception unit and a television reception unit, etc., and a recording area such as a hard
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disk storing map information A navigation unit (reproduction means) 3 for providing map
information and route guidance information; a DSP / bus / treble circuit (correction means) 4 for
correcting the sound reproduced by the audio source 2 and the navigation unit 12; A
microcomputer 5 connected to a microcomputer 5 for controlling the entire control device 1, a
volume circuit 6 for adjusting the volume, and a speaker 7 for outputting sound to control
driving of the speaker 7. And a driver circuit (power IC) 8.
[0032]
The microcomputer 5 of the present embodiment has a memory 9. In the memory 9, an
operating system (OS) 10 which is a basic program of the microcomputer 5, an application
program 11 for various control, and execution of the application program 11 And a table 12
storing various data used in connection with the above.
[0033]
Further, in the voice control device 1 of the present embodiment, a noise detection microphone
13 for collecting the sound (noise, noise) in the vehicle, and a crank position sensor 14 for
detecting a pulse signal generated along with the traveling of the vehicle. And a vibration sensor
15 provided on at least one of the inner side and the outer side of the vehicle to detect the
vibration state of the vehicle.
The vibration sensor 15 is particularly effective for detecting noise generated by the friction
between the tire and the road surface.
[0034]
Further, although the noise detection microphone 13 of the present embodiment is provided on
the front surface of the main body of the navigation unit 3, this position is not particularly
limited.
Further, in the description of the present embodiment, the noise in the vehicle collected by the
noise detection microphone 13 and the road noise calculated from the detection results of the
crank position sensor 14 and the vibration sensor 15 are combined and described as running
noise. Do.
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[0035]
The table 12 stores data in which at least one of the traveling speed, acceleration, and vibration
of the vehicle is associated with the value of the correction amount of the frequency of the sound
data.
For example, if the data stored in the table 12 has a relationship between speed and noise level,
the running noise will be 80 dB if the running speed is 20 km / h, and the running noise will be
65 dB if the running speed is 80 km / h When the traveling speed is 40 km / h, each data is
associated and stored in the table 12 such that the traveling noise is 50 dB.
Also in the respective data of acceleration and vibration, values corresponding to the traveling
noise are stored in the table 12.
[0036]
In addition, the A / D converter 16 converts the digital signal output from the audio source group
2 or the navigation unit 3 and the noise collected by the noise detection microphone 13 into
digital data. And a D / A converter 17 for converting digital data corrected by the DSP / bus
treble circuit 4 into analog data.
[0037]
The above is the configuration of the voice control device 1 of the present embodiment.
<Regarding Frequency Correction of Sound Data> Next, correction of sound data in the voice
control device 1 of the present embodiment will be described in detail based on the flowchart
shown in FIG.
[0038]
First, the voice control device 1 adjusts noise in the vehicle with the noise detection microphone
13 in order to adjust the frequency component level at the time of reproduction of sound data
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such as music and sound recorded on a recording medium such as a CD or MD. At the same time
as collecting a sound, road noise is measured by the crank position sensor 14 and the vibration
sensor 15 (S01).
[0039]
The crank position sensor 14 detects a pulse signal generated as the vehicle travels.
The traveling speed and acceleration of the vehicle can be calculated from this pulse signal.
In many cases, the faster the traveling speed or the greater the acceleration, the larger the road
noise.
[0040]
Furthermore, the vibration sensor 15 detects the vibration generated in the running vehicle. The
vibration increases when traveling on uneven road surfaces or gravel roads. As the vibration
increases, the noise in the car also increases.
[0041]
Then, the microcomputer 5 calculates the traveling speed or acceleration of the vehicle from the
pulse signal detected by the crank position sensor 14, and extracts the correction amount of the
frequency associated with the traveling speed or acceleration from the table 12. Further, the
microcomputer 5 extracts from the table 12 the correction amount of the frequency associated
with the vibration amount during traveling of the vehicle detected by the vibration sensor 15.
The correction amount of the frequency component is set in consideration of the magnitude of
noise predicted according to the traveling speed, the acceleration, and the magnitude of the
vibration amount.
[0042]
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11
In this embodiment, at this stage, the microcomputer 5 determines whether the road noise
calculated from the pulse signal and the amount of vibration and the noise in the car collected by
the noise detection microphone 13 are 80 dB or more. (S02). Here, when the microcomputer 5
determines that the running noise is 80 dB or more, the DSP / bus / treble circuit 4 is instructed
to correct the frequency component level of the sound data of the same band as the band where
the frequency component level of the running noise is high. Is taken out (S03).
[0043]
In response to a command from the microcomputer 5, the DSP / bus / treble circuit 4, as shown
in FIG. 3, controls the level of the frequency component of the sound data to a band where the
frequency component level of running noise is high (for example, 0 to 100 Hz) Correction to -5
dB within the same band as (see B in FIG. 3). The thin solid line in the graph of FIG. 3 is the
waveform of running noise, the broken line is the waveform of sound data before correction, and
the thick solid line is the waveform of sound data after correction.
[0044]
If the microcomputer 5 determines in step 02 that the traveling noise is not 80 dB or more, it
determines whether it is 65 dB or more (S03). Here, if the microcomputer 5 determines that the
running noise is 65 dB or more, it instructs the DSP / bus treble circuit 4 to correct the output
level of the bus in the sound data (S05).
[0045]
In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 adjusts the
frequency component level of the sound data in the same band as the band where the frequency
component level of the traveling noise is high to -3 dB.
[0046]
If the microcomputer 5 determines in step 04 that the traveling noise is not 65 dB or more, it is
determined whether it is 50 dB or more (S06).
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Here, when the microcomputer 5 determines that the running noise is 50 dB or more, the DSP /
bus / treble circuit 4 is instructed to correct the frequency component level of the sound data of
the same band as the band where the frequency component level of the running noise is high.
(S07).
[0047]
In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 adjusts the
frequency component level of the sound data of the same band as the band where the frequency
component level of the traveling noise is high to -2 dB. In the present embodiment, when it is
determined in step 06 that the traveling noise is not 50 dB or more, the processing is ended
without adjusting the frequency component level of the sound data.
[0048]
As described above, by lowering the level of the frequency in the low band (for example, 0 to 100
Hz) of the sound data according to the magnitude of the level of the traveling noise, the human
voice in the sound data can be easily heard.
[0049]
In many cases, when running noise occurs, the sound data becomes difficult to hear.
If the volume level of the sound data itself is raised in order to solve that, there may be a band
that is difficult for the viewer to hear. In particular, the band of 100 Hz to 4 kHz, which is the
band of human voice, becomes difficult for the viewer to hear by raising the volume level when
the traveling noise is 50 dB or more. In other words, when the music containing vocals is
reproduced by car audio, the vocals can not be heard in a vehicle having a traveling noise of 50
dB or more.
[0050]
However, according to the voice control device 1 of the present embodiment, the frequency
08-05-2019
13
component of the sound data of the same band as the band where the level of the frequency
component of the traveling noise is high is lowered. As a result, the level of the frequency
component of the other band of the sound data can be enhanced, and as a result, the viewer can
output a sound that is easy to hear the vocal sound.
[0051]
Further, by installing the noise detection microphone 13 on the deck of the navigation unit 3 set
in the vehicle, the noise in the vehicle can be directly measured. This makes it possible to collect
noise that is as close as possible to the noise actually heard by the driver or passenger in the
vehicle. Therefore, the sound data can be adjusted so that the driver 7 and the passenger can
most easily hear the sound from the speaker 7 without worrying about the running noise.
[0052]
Furthermore, according to the voice control device 1 of the present embodiment, the
intelligibility of the sound of the human voice band can be increased, and therefore, the
navigation unit during traveling of a road with poor road condition such as mountain road or
gravel road. The voice of the road guidance can also be output clear without being overwhelmed
by running noise.
[0053]
In the voice control device 1 of the present embodiment, the navigation unit 3 and the audio
source 2 are described as an integral type with the voice control device 1 as means for
reproducing sound data, but as shown in FIG. The source (reproduction unit) may be a separate
body, and only the control system for performing level correction of the frequency component of
the sound data such as the DSP / bus / treble circuit 4, the microcomputer 5, the volume circuit
6 may be used as a correction device.
[0054]
The voice control device of this embodiment can also be connected to a mobile phone having a
hands-free function that can be used to transmit and receive speech with the mobile phone
without holding the mobile phone by hand.
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14
The voice control apparatus of this embodiment has the same configuration as that of the voice
control apparatus of the first embodiment, and the same reference numerals are given to the
same components in the drawings.
Further, in the present embodiment, the mobile phone is described as being used in a car, but the
present invention is not particularly limited thereto.
[0055]
As shown in FIG. 5, the voice control device 1 of the present embodiment is connected to a
mobile phone 20 and a speaker 7 for outputting a received voice by the mobile phone 20. The
mobile phone 20 is an existing one and has the structure of a general mobile phone. The
connection between the mobile telephone 20 and the voice control device 1 can be made at the
power supply terminal or earphone terminal of the mobile telephone 20.
[0056]
Further, the voice control device 1 of the present embodiment includes a DSP / bus / treble
circuit 4 for correcting the received voice from the mobile phone, a microcomputer 5 for
controlling the entire voice control device 1, and a volume of the received voice to be output. And
a speaker driving circuit 8 connected to the speaker 7 for outputting received voice and
controlling the driving of the speaker 7.
[0057]
The above is the configuration of the voice control device 1 of the present embodiment.
<Regarding Frequency Correction of Sound Data> Next, the correction of the reception voice in
the voice control device 1 of the present embodiment will be described in detail.
[0058]
First, the voice control device 1 measures traveling noise with the noise detection microphone
13, the crank position sensor 14, and the vibration sensor 15 in order to adjust the frequency
component of the received voice of the mobile phone 20.
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[0059]
Then, the microcomputer 5 calculates the traveling speed or acceleration of the vehicle from the
pulse signal detected by the crank position sensor 14, and extracts the correction amount of the
frequency associated with the traveling speed or acceleration from the table 12.
Further, the microcomputer 5 extracts from the table 12 the correction amount of the frequency
associated with the vibration amount during traveling of the vehicle detected by the vibration
sensor 15.
[0060]
In this embodiment, at this stage, the microcomputer 5 determines whether or not traveling noise
obtained by combining the pulse signal and the vibration is 80 dB or more. Here, when the
microcomputer 5 determines that the running noise is 80 dB or more, it instructs the DSP / bus /
treble circuit 4 to correct the output level of the bass band in the received voice data.
[0061]
In response to the command from the microcomputer 5, the DSP / bus / treble circuit 4 sets the
level of the frequency component of the received voice data within the same band as the band
(for example, 0 to 100 Hz) where the frequency component level of the traveling noise is high. To
-5 dB.
[0062]
If the microcomputer 5 determines that the traveling noise is not 80 dB or more, it determines
whether it is 65 dB or more.
Here, if the microcomputer 5 determines that the running noise is 65 dB or more, it instructs the
DSP / bus treble circuit 4 to correct the frequency component level (output level) of the bass
band in the reception voice data.
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[0063]
In response to the command from the microcomputer 5, the DSP / bus / treble circuit 4 adjusts
the level of the frequency component of the received voice data to -3 dB within the same band as
the band where the frequency component level of the running noise is high.
[0064]
If the microcomputer 5 determines that the traveling noise is not 65 dB or more, it determines
whether the traveling noise is 50 dB or more.
Here, if the microcomputer 5 determines that the running noise is 50 dB or more, it instructs the
DSP / bus / treble circuit 4 to correct the frequency component level of the bass band in the
received voice data.
[0065]
In response to the command from the microcomputer 5, the DSP / bus / treble circuit 4 adjusts
the frequency component level of the received voice data to be -2 dB within the same band as the
band where the frequency component level of the running noise is high. . In the present
embodiment, when it is determined that the traveling noise is not 50 dB or more, the process is
ended without adjusting the frequency component of the reception voice data.
[0066]
As described above, by lowering the level of the frequency component in the low range of the
reception voice data in accordance with the level of the running noise, the high range in the
reception voice is significantly more easily heard.
[0067]
Further, by installing the noise detection microphone 13 on the deck of the navigation unit 3 set
in the vehicle, the noise in the vehicle can be measured directly, so that the driver or passenger
08-05-2019
17
in the vehicle can actually receive the noise. It is possible to detect noise that is as close as
possible to the noise that can be heard.
As a result, the receiver voice data can be adjusted, and the receiver voice can be output from the
speaker 7 that the driver or the passenger can most easily hear, without worrying about the
running noise.
[0068]
Furthermore, according to the voice control device 1 of the present embodiment, it is possible to
output clear received voice from the mobile phone 20 while traveling on a road with poor road
condition such as a mountain road or a gravel road.
[0069]
Although the voice control device 1 and the mobile phone 20 have been described as separate
bodies in the present embodiment, the voice control device of the present invention may be
incorporated in the mobile phone.
In this case, the noise detection microphone can be used together with a microphone for
reception of the mobile phone.
[0070]
Further, the voice control device of the present invention may be configured to lower the level of
the noise band and raise the level of the other bands.
[0071]
FIG. 1 is a block diagram of a voice control device according to a first embodiment.
7 is a correction control flow by the voice control device according to the first embodiment. It is
a graph which shows the correction | amendment content of the traveling noise distribution of
Example 1, and the frequency component of sound data. FIG. 7 is a block diagram of a voice
08-05-2019
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control device according to another aspect of the first embodiment. FIG. 7 is a block diagram of a
voice control device according to a second embodiment. It is a graph which shows the correction
content of the conventional driving | running | working noise distribution and the frequency
component of sound data.
Explanation of sign
[0072]
DESCRIPTION OF SYMBOLS 1 audio control apparatus 2 audio source (reproduction means) 3
navigation part (reproduction means) 4 bus and treble circuit (correction means) 5
microcomputer 6 volume circuit 7 speaker 8 speaker drive circuit 9 memory 10 OS 11
application program 12 table 13 noise detection Microphone (noise detection means) 14 Crank
position sensor (noise detection means) 15 Vibration sensor (vibration measurement means) 16
A / D converter 17 D / A converter 20 Mobile phone
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