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DESCRIPTION JPH05308698

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DESCRIPTION JPH05308698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle sound reproducing apparatus.
[0002]
2. Description of the Related Art In recent years, for example, on highways etc., traffic
information such as road congestion, traffic accident occurrence status, construction status, etc.
is promptly informed to the driver of the vehicle, avoiding confusion of the road and comfortable
driving. Traffic information broadcasts are transmitted using a predetermined frequency in order
to do so and thus ensure the safety of travel. In order to receive this traffic information broadcast
safely and reliably while driving, when the vehicle is in the traffic information broadcast
reception area, it automatically receives the traffic information broadcast and goes out of the
traffic information broadcast reception area. An on-vehicle sound reproducing apparatus has
been developed that automatically terminates reception.
[0003]
Hereinafter, an on-vehicle sound reproducing apparatus having a conventional traffic information
receiving function will be described.
[0004]
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FIG. 6 is a block diagram showing the configuration of a conventional on-vehicle sound
reproducing apparatus.
In FIG. 6, 128 is a sound source device such as a cassette tape player or CD player, 102, 103,
115 and 116 are power amplifiers, 104 is a driver's seat speaker, 105 is a passenger seat
speaker, 117 is a rear seat right speaker, and 118 is a rear speaker. It is a seat left speaker. 101
is a traffic information tuner for receiving traffic information, 601 and 602 are signal selection
means for selectively outputting the output of the sound source device 128 and the output of the
traffic information tuner 101, and 603 is of the radio wave received by the traffic information
tuner 101. It is a control means which controls the signal selection means 601, 602 according to
the electric field strength.
[0005]
The operation of the on-vehicle acoustic control apparatus configured as described above will be
described below.
[0006]
The outputs from the sound source device 128 and the traffic information tuner 101 are input to
signal selection means 601 and 602.
The signal selection means 601, 602 outputs the output of either the sound source device 128 or
the traffic information tuner 101 to the power amplifiers 102, 103 according to the control
signal from the control means 603. The outputs from the power amplifiers 102 and 103 are
input to the speakers 104 and 105 and output to the vehicle interior. The output from the tone
generator 128 is input to the power amplifiers 115 and 116. The outputs from the power
amplifiers 115 and 116 are input to the speakers 117 and 118 and output to the vehicle interior.
[0007]
When the electric field strength of the traffic information broadcast wave in the traffic
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information tuner 101 is equal to or less than a predetermined value, the control means 603
controls the signal selection means 601, 602 to select the output of the sound source device 128.
In addition, when it is desired to stop the reproduction sound of the sound source device 128 for
conversation or use of a car phone, the reproduction of the sound source device 128 is stopped.
[0008]
When the electric field strength of the traffic information broadcast wave in the traffic
information tuner 101 is equal to or higher than a predetermined value, the control means 603
controls the signal selection means 601 and 602 to select the output of the traffic information
tuner 101. When listening to the reproduction sound of the sound source device 128 at the rear
seat, the sound source device 128 is set to the reproduction state, and when it is desired to stop
the reproduction sound, the reproduction of the sound source device 128 is stopped.
[0009]
As a result, when the car enters the area where traffic information is broadcasted, the audio
signal to be heard in the front seat automatically switches from the output of the sound source
device 128 to traffic information, and the area where the traffic information is broadcasted When
going out, it automatically switches to the output of the original sound source device 128. In the
rear seat, it is possible to listen to the reproduced sound of the sound source device 128
regardless of whether the car is in or out of the area where the traffic information is broadcast.
[0010]
However, in the configuration of the above-described conventional example, the front seat
speaker can be used in the rear seat even if the reproduction of the sound source device 128 is
stopped for conversation or use of a car phone in the rear seat when traffic information is
received. There is a problem that the reproduction sound of traffic information transmitted from
the terminal is audible and noise.
[0011]
In addition, when the two sources of traffic information and the output of the sound source
device are simultaneously reproduced in the front and rear seats respectively, the other sound
becomes noise and it becomes extremely difficult to hear.
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3
[0012]
The present invention solves the above-mentioned conventional problems, and at the time of
traffic information reception, the reproduction sound of the traffic information in the front seat
can be heard without being deteriorated by the reproduction sound of the sound source device
transmitted from the rear seat speaker. In addition, it is an object of the present invention to
provide an on-vehicle sound reproducing apparatus with a simple configuration, which can be
played back without noise deterioration of the SN ratio due to the reproduced sound of traffic
information transmitted from the front seat speaker. I assume.
[0013]
[Means for Solving the Problems] In order to achieve this object, an on-vehicle sound
reproducing apparatus according to the present invention comprises: (1) a first sound source
device, a second sound source device, and At least one front seat speaker for acoustically
outputting the reproduction signal of the first sound source device or the reproduction signal of
the second sound source device into the vehicle compartment, and the reproduction signal of the
second sound source device installed near the rear seat At least one rear seat speaker that
outputs the sound into the vehicle compartment, a low pass filter unit that extracts mid-low
range components of the first sound source device output, and a reproduction signal of the first
sound source device from the front seat speaker In the case of the output, the transmission
characteristic correction unit corrects the transmission characteristic of the output of the low
pass filter unit and outputs the corrected transmission characteristic to the rear seat speaker.
[0014]
(2) A first sound source device, a second sound source device, and a reproduction signal of the
first sound source device installed in the vicinity of a front seat of a car or a reproduction signal
of the second sound source device At least one front seat speaker that outputs, at least one rear
seat speaker installed near the rear seat and acoustically outputting the reproduction signal of
the second sound source device into the vehicle compartment, and a rear seat installed near the
rear seat listening position A microphone for detecting an acoustic signal at a listening position, a
low pass filter unit for extracting a mid-bass component of the output of the first sound source
device, and a reproduced signal of the first sound source device from the front seat speaker
When it is present, it comprises an adaptive filter unit which controls the transfer characteristic
of the low pass filter unit output according to the microphone output and outputs it to the rear
seat speaker.
[0015]
(3) A first sound source device, at least one front seat speaker installed in the vicinity of a front
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seat of a car and acoustically outputting a reproduction signal of the first sound source device
into a vehicle compartment, a second sound source device At least one rear seat speaker installed
near the seat and acoustically outputting the reproduction signal of the second sound source
device into the vehicle compartment, and a first one installed near the rear seat listening position
and detecting an acoustic signal at the rear seat listening position Controlling a transfer
characteristic of the output of the first low-pass filter unit according to the microphone, a first
low-pass filter unit for extracting mid-low range components of the first sound source device
output, and the first microphone output; A first adaptive filter unit for outputting to a rear seat
speaker, a second microphone installed near the front seat listening position and detecting an
acoustic signal at the front seat listening position, and a mid-bass component of the second
sound source device output To extract And a second adaptive filter unit which controls the
transfer characteristic of the output of the second low pass filter unit according to the second
microphone output and outputs the same to the front seat speaker.
[0016]
(4) A first sound source device, a first speaker disposed in the vicinity of the right ear of a driver
of a car and acoustically outputting a reproduction signal of the first sound source device into a
vehicle compartment, and a vicinity of the driver's left ear A second speaker installed in the
vehicle to acoustically output the reproduction signal of the first sound source device into the
vehicle compartment, at least one second acoustically outputting the reproduction signal of the
second sound source device into the vehicle interior Characteristics of the second sound source
device output according to the two microphones, the first microphone installed near the driver's
right ear and detecting an acoustic signal at the right ear position, and the first microphone
output. A first adaptive filter that controls and outputs to the first speaker, a second microphone
installed near the left ear of the driver and detecting an acoustic signal at the position of the left
ear, and the second microphone output Of the second sound source device output And a second
adaptive filter that controls the transfer characteristic and outputs it to the second speaker.
[0017]
According to the present invention, according to the above configuration, (1) a cancellation
sound for canceling the reproduction sound from the first sound source device which is output
from the front seat speaker and transmitted to the rear seat listening position is canceled at the
rear seat listening position. It is generated in the transfer characteristic correction unit.
The cancellation sound is band-limited to the mid-bass range by the low pass filter unit and
output from the rear seat speaker, thereby reducing the mid-bass range of the reproduction
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sound of the first sound source device at the rear seat listening position.
[0018]
(2) In the adaptive filter unit, a signal obtained by band-limiting the reproduced sound from the
first sound source device to the mid-bass region by the low pass filter unit is used as a reference
input and detected by the microphone installed at the rear seat listening position Control the
transfer characteristics of the adaptive filter unit so that the square value of the sound signal at
the minimum becomes minimum, and reproduce the sound from the first sound source device
output from the front seat speaker and transmitted to the rear seat listening position The midlow range of the reproduction sound of the first sound source device at the rear seat listening
position is reduced by generating a cancellation sound for canceling out at the rear seat speaker
and outputting it from the rear seat speaker.
[0019]
(3) In the first adaptive filter unit, a signal obtained by band-limiting the reproduced sound from
the first sound source device by the low pass filter unit to the mid-bass region is used as the
reference input and is the first microphone installed at the rear seat listening position The
transfer characteristic of the first adaptive filter unit is controlled so that the square value of the
acoustic signal at the detected rear seat listening position becomes minimum, and a cancellation
sound for the reproduction sound of the first sound source device is generated. Thus, the mid-low
range of the reproduced sound of the first sound source device at the rear seat listening position
is reduced, and the SN ratio of the reproduced sound of the second sound source device at the
rear seat listening position is improved.
[0020]
Furthermore, in the second adaptive filter unit, a signal obtained by band-limiting the reproduced
sound from the second sound source device by the low pass filter unit to the mid-bass region is
used as a reference input and detected by the second microphone installed at the front seat
listening position The transfer characteristic of the second adaptive filter unit is controlled so
that the square value of the sound signal at the front seat listening position becomes minimum,
and the cancellation sound to the reproduction signal from the second sound source device is
generated. Thus, the mid-low range of the reproduced sound of the second sound source device
at the front seat listening position is reduced, and the SN ratio of the reproduced sound of the
first sound source device at the front seat listening position is improved.
[0021]
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(4) The transfer characteristic of the first adaptive filter is controlled so that the square value of
the acoustic signal at the right ear position detected by the first microphone installed near the
driver's right ear is minimized; Generate a cancellation sound for the playback sound of the
sound source device.
By reproducing the cancellation sound from the first speaker installed near the driver's right ear,
the reproduction sound from the second sound source device reaching the right ear of the
driver's seat is canceled.
[0022]
Further, the transfer characteristic of the second adaptive filter is controlled to minimize the
square value of the acoustic signal at the left ear position detected by the second microphone
installed near the left ear of the driver, and the second sound source Generate a cancellation
sound for the playback sound of the device.
By reproducing the cancellation sound from the second speaker installed near the left ear of the
driver, the reproduction sound from the second sound source device reaching the left ear of the
driver's seat is canceled.
[0023]
Furthermore, the output of the first sound source device is reproduced from the first speaker
installed near the driver's right ear and the second speaker installed near the driver's left ear.
[0024]
Thereby, the reproduction sound of the second sound source device at the driver's seat is
reduced, and the SN ratio of the reproduction sound of the first sound source device is improved.
[0025]
Embodiments of the present invention will be described below with reference to the drawings.
[0026]
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FIG. 1 is a block diagram showing the configuration of a vehicle-mounted sound reproduction
apparatus according to a first embodiment of the present invention.
[0027]
In FIG. 1, 101 is a traffic information tuner for receiving traffic information, 128 is a sound
source device other than traffic information tuner 101, and 133 is a second signal selection unit
for selecting an output of traffic information tuner 101 and an output of sound source device
128. It is.
Reference numerals 102 and 103 denote power amplifiers for amplifying the output of the signal
selection unit 133, 104 denotes a driver's seat speaker, and 105 denotes a passenger seat
speaker.
106 is an A / D converter that converts the output of the traffic information tuner 101 into a
digital signal, 131 is a low pass filter unit that extracts mid-low range components of the output
of the A / D converter 106, and 129 is an output of the low pass filter unit 131 Transfer
characteristic correction unit that corrects the transfer characteristic to the D / A conversion unit
130 converts the signal of the transfer characteristic correction unit 129 into an analog signal,
and 132 an output from the D / A conversion unit 130 and an output from the sound source
equipment 128 And a signal selection unit that selects the
Reference numerals 115 and 116 denote power amplifiers for amplifying the output of the signal
selection unit 132, 117 denotes a rear right speaker, and 118 denotes a rear left speaker.
Reference numeral 119 denotes control means for controlling the signal selection units 132 and
133 according to the electric field intensity of the radio wave received by the traffic information
tuner 101, and 120 denotes operation means for inputting at which position on the rear seat a
person is riding. And is connected to the transfer characteristic correction unit 129.
[0028]
The relationship and operation of each component described above will be described.
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First, the case where the electric field strength of the radio wave received by the traffic
information tuner 101 is weak and the traffic information can not be heard will be described.
At this time, the control unit 119 controls the signal selection units 132 and 133 to select the
output of the sound source device 128.
As a result, the reproduced sound of the sound source device 128 is output from the speakers
104, 105, 117, and 118, and the passenger can listen to the reproduced sound of the sound
source device 128.
In addition, when using a car phone in a rear seat or talking, the reproduction of the sound
source device 128 is stopped to prevent the reproduction sound from the speakers 104, 105,
117, 118 from being output.
[0029]
Next, the case where the electric field strength of the radio wave received by the traffic
information tuner 101 is higher than a predetermined level and the traffic information can be
heard will be described.
At this time, the signal selection unit 133 selects the output of the traffic information tuner 101
according to the signal from the control means 119.
The output from the traffic information tuner 101 is input to the power amplifiers 102 and 103
through the signal selection unit 133 and is acoustically output from the speakers 104 and 105
so that the front passenger can listen to the reproduced sound of the traffic information.
[0030]
On the other hand, the output from the traffic information tuner 101 is converted into a digital
signal by the A / D converter 106, and is input to the low pass filter unit 131.
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[0031]
Here, the operation of the low pass filter unit 131 will be described.
FIG. 2 is a view showing the positional relationship between a passenger and a speaker of a car,
wherein 201 is a front seat speaker, 202 is a rear seat speaker, 203 is a passenger, 204 is a right
ear of the passenger 203, and 205 is a left ear of the passenger 203. .
The distance between the front seat speaker 201 and the right ear 204 is w, the distance
between the front seat speaker 201 and the left ear 205 is x, the distance between the rear seat
speaker 202 and the right ear 204 is y, the rear seat speaker 202 and the left ear 205 Let z be
the distance between them.
[0032]
The reproduced sound from the front seat speaker 201 causes a phase difference corresponding
to the distance (x−w) between the right ear 204 and the left ear 205. Similarly, the reproduced
sound from the rear seat speaker 202 causes a phase difference corresponding to the distance
(z−y) at the right ear 204 and the left ear 205. Therefore, in order for the right ear 204 to
cancel the reproduction sound from the front seat speaker 201 by the reproduction sound from
the rear seat speaker 202, the reproduction sound from the rear seat speaker 202 has the same
level as the reproduction sound from the front seat speaker 201 in reverse phase. In the left ear
205 as well, the same offset effect as the right ear 204 can not be obtained due to the phase
difference corresponding to the distance X determined by X = (x−w) − (z−y). A cancellation
effect is obtained when the phase difference between sounds that cancel each other is 180 ° ±
λ / 4 or less for a signal of wavelength λ. The distance X varies depending on the position of
the speaker and the seating position, but is about ± 5 cm in a general passenger car, so even in
the band of about 1.6 KHz or less, the left ear 205 has a canceling effect. Therefore, the cutoff
frequency of the low pass filter section 131 is set to about 1.6 KHz, and the band is limited to
about 1.6 KHz or less.
[0033]
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The output of the low pass filter unit 131 is input to the transfer characteristic correction unit
129. In the operation means 120, the seating condition of the rear seat occupant is selected from
the two for the rear seat right and the rear seat left, and the transfer characteristic correction
unit 129 is prepared in advance according to the seating condition of the rear seat occupant
input from the operating means 120. The transfer characteristic of the input signal from the lowpass filter unit 131 is corrected.
[0034]
First, the case where a person is sitting at point P in FIG. 1, that is, the right side of the rear seat
will be described.
[0035]
The transfer characteristic from the front seat speaker 104 to the point P is ADR, and the
transfer characteristic from the rear seat right speaker 117 to the point P is ARR.
Assuming that the input of the front seat speaker 104 is X, the sound from the speaker 104
transmitted to the point P is ADRX. Also, assuming that the input of the rear seat speaker 117 is
Y, the sound from the speaker 117 transmitted to the point P is ARRY. Therefore, in order to
cancel the sound transmitted from the speaker 104 at the point P by the speaker 117, ADRX +
ARRY = 0Y = −ARR−1 · ADRX may be set.
[0036]
The transfer characteristic correction means 107 corrects the output from the low pass filter 111
by the transfer function having the characteristic of -ARR-1 · ADR, and outputs the corrected
output to the D / A converter 109.
[0037]
Similarly, in the transfer characteristic correction means 108, using the transfer characteristic
ACR from the front seat speaker 105 to the point P and the reverse transfer characteristic ALR-1
from the rear left speaker to the point P, the characteristics of -ALR-1 · ACR The output of the low
pass filter 112 is corrected by the transfer function having the following equation, and is output
to the D / A converter 110.
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[0038]
When a person is sitting on point Q in FIG. 1, that is, on the left side of the rear seat, in the
transmission characteristic correction means 107, the transmission characteristic ADL from the
front seat speaker 104 to the point Q and the rear seat right speaker 117 to the point Q The
output of the low-pass filter 111 is corrected by the transfer function having the characteristic of
-ARL-1 · ADL using the inverse transfer characteristic ARL-1 of the following equation, and is
output to the D / A converter 109. Using the transfer characteristic ACL from the front seat
speaker 105 to the point Q and the reverse transfer characteristic ALL-1 from the rear seat left
speaker 118 to the point Q, the output of the low pass filter 112 by the transfer function having
the characteristic of -ALL-1 · ACL Are corrected and output to the D / A converter 110.
[0039]
The D / A converter unit 130 converts the input signal into an analog signal, which is input to the
power amplifiers 115 and 116 through the signal selection unit 132, and is acoustically output
from the speakers 117 and 118. The mid-low range reproduction sound of the traffic information
reproduced from the seat speakers 104 and 105 is reduced.
[0040]
As described above, according to the present embodiment, the cancellation sound generated in
the low pass filter unit and the transfer characteristic correction unit is reproduced from the rear
seat speaker, whereby traffic information transmitted from the front seat speaker at the rear seat
listening position is The mid-low range of the reproduced sound can be reduced, and even when
traffic information is received during driving and reproduced in the front seat, conversations
such as a car telephone in the rear seat do not occur.
[0041]
FIG. 3 is a block diagram showing the configuration of a vehicle-mounted sound reproduction
apparatus according to a second embodiment of the present invention.
In FIG. 3, components different from FIG. 1 will be described.
[0042]
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12
In FIG. 3, reference numeral 126 denotes a microphone for detecting an in-room acoustic signal
at a rear seat listening position, which is installed at a position where noise is desired to be
reduced, for example, near the head of an occupant or in a receiver of a car phone.
A microphone amplifier unit 125 amplifies the signal of the microphone 126, and an A / D
converter 124 converts the output of the microphone amplifier unit 126 into a digital signal.
An adaptive filter unit 134 receives the output of the A / D converter 106 and whose transfer
characteristic is controlled by the output of the A / D converter 124.
[0043]
The components other than those described above are the same as the components given the
same reference numerals as in FIG. 3 in the first embodiment.
[0044]
The relationship and operation of each component described above will be described.
The case where the electric field strength of the radio wave received by the traffic information
tuner 101 is weak and the traffic information can not be heard is the same as that of the first
embodiment, so the description will be omitted.
[0045]
The case where the electric field strength of the radio wave received by the traffic information
tuner 101 is higher than a predetermined level and traffic information can be heard will be
described.
At this time, the signal selection unit 133 selects the output of the traffic information tuner 101
according to the signal from the control means 119.
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The output from the traffic information tuner 101 is input to the power amplifiers 102 and 103
through the signal selection unit 133, and is acoustically output from the speakers 104 and 105
so that the front passenger can listen to the reproduced sound of the traffic information.
[0046]
Next, the reproduction sound reduction operation of the traffic information transmitted from the
front seat speaker at the rear seat listening position will be described.
[0047]
The microphone 126 detects an in-room acoustic signal at a rear seat listening position.
The output of the microphone 126 is amplified by the microphone amplifier 125, converted to a
digital signal by the A / D converter 124, and input to the adaptive filter unit 134.
[0048]
Further, the output from the traffic information tuner 101 is converted into a digital signal by the
A / D converter 106, and is input to the low pass filter unit 131. The low-pass filter unit 131
extracts the middle bass region for the same reason as that of the first embodiment. The output
of the low pass filter unit 131 is input to the adaptive filter unit 134. The adaptive filter unit 134
processes the output of the low pass filter unit 131 so as to minimize the square value of the
vehicle interior acoustic signal input from the A / D converter 124, and outputs the processed
output to the D / A conversion unit 130. The D / A conversion unit 130 converts the input signal
into an analog signal. The output of the D / A conversion unit 130 is input to the power
amplifiers 115 and 116 through the signal selection unit 132, power amplified, and acoustically
output from the speakers 117 and 118, and transmitted from the front speakers 104 and 105 at
the rear seat listening position. The mid-low range of the reproduced traffic information is
canceled and reduced.
[0049]
As described above, according to the present embodiment, when the cancellation sound for
canceling the reproduction sound of the traffic information transmitted from the front seat
speaker at the rear seat listening position is generated, the reproduction sound of the traffic
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information of the rear seat is canceled A microphone is installed at a desired position to detect
an acoustic signal including reproduced sound of traffic information, and the transfer
characteristic of the adaptive filter is controlled to minimize the square value of the signal
detected from the microphone. As compared with the embodiment of the present invention, the
reproduced sound of traffic information at the rear seat listening position can be canceled more
accurately.
[0050]
FIG. 4 is a block diagram showing the configuration of a vehicle-mounted sound reproduction
apparatus according to a third embodiment of the present invention.
In FIG. 4, components different from those in FIG. 3 will be described.
[0051]
In FIG. 4, reference numeral 406 denotes a microphone for detecting an in-cabin acoustic signal
at a driver's seat listening position, 407 denotes a microphone amplifier for amplifying the signal
of the microphone 406, and 408 denotes A / D for converting the output of the microphone
amplifier 406 into a digital signal. It is a converter.
[0052]
415 is an A / D converter for converting the output of the sound source device 128 into a digital
signal, 419 is a low pass filter for extracting mid-low range components of the output of the A /
D converter 415, and 416 is an output of the low pass filter 419 Adaptive filter unit that is input
and whose transfer characteristics are controlled by the output of A / D converter 408, 418 is a
D / A converter that converts the output of adaptive filter unit 416 into an analog signal, and
424 is an output of traffic information tuner 101 And the output of the D / A converter 418 and
the output of the tone generator 128 are selectively added.
An addition unit 423 selectively adds the outputs of the sound source device 128 and the D / A
conversion unit 130. Reference numeral 417 denotes control means for controlling the adding
units 423 and 424 in accordance with the electric field strength of the radio wave received by
the traffic information tuner 101.
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[0053]
The components other than those described above are the same as the components given the
same reference numerals as in FIG. 4 in the second embodiment.
[0054]
The relationship and operation of each component described above will be described.
First, the case where the electric field strength of the radio wave received by the traffic
information tuner 101 is weak and the traffic information can not be heard will be described. At
this time, the control means 417 controls the addition units 423, 424 to select only the signal
from the sound source device 128.
[0055]
The right channel output of the sound source device 128 is input to the adder 403 in the
addition unit 424, transmitted to the power amplifier 102, amplified in power, and output as
sound from the speaker 104. The right channel output of the sound source device 128 is input to
the adder 401 in the addition unit 423, transmitted to the power amplifier 115, amplified in
power, and output as sound from the speaker 117.
[0056]
The left channel output of the sound source device 128 is input to the adder 420 in the addition
unit 424, transmitted to the power amplifier 103, amplified in power, and output from the
speaker 105 as sound. The left channel output of the sound source device 128 is input to the
adder 402 in the addition unit 423, transmitted to the power amplifier 116, amplified in power,
and output as sound from the speaker 118.
[0057]
Next, the case where the electric field strength of the radio wave received by the traffic
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information tuner 101 is higher than a predetermined level and the traffic information can be
heard will be described.
[0058]
The control unit 417 controls the addition unit 424 to add the output of the traffic information
tuner 101 and the output of the D / A conversion unit 418 and output the same. Therefore, the
output of the traffic information tuner 101 is reproduced from the front seat speakers 104 and
105. Ru.
Further, the control unit 417 controls the addition unit 423 to add the output of the sound
source device 128 and the output of the D / A conversion unit 130 and output the same.
Therefore, the output from the sound source device 128 is reproduced from the rear seat
speakers 117 and 118 Be done.
[0059]
The cancellation sound to the reproduction sound of the traffic information tuner 101
transmitted from the front seat speakers 104 and 105 to the rear seat listening position is
generated by the same operation as the second embodiment, and is acoustically output from the
rear seat speakers 117 and 118, The mid-low range of the reproduction sound of the traffic
information tuner 101 transmitted from the front seat speakers 104 and 105 at the rear seat
listening position is canceled and reduced.
[0060]
On the other hand, at the front seat listening position, the microphone 406 detects an acoustic
signal at the driver's seat.
The output of the microphone 406 is amplified by the microphone amplifier 407, converted to a
digital signal by the A / D converter 408, and then input to the adaptive filter unit 416.
[0061]
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Further, the output from the sound source equipment 128 is converted into a digital signal by
the A / D converter 415, and the low pass filter 419 limits the band for the same reason as that
of the first embodiment, and is input to the adaptive filter 416. The adaptive filter unit 416
processes the output of the low pass filter 419 so that the square value of the acoustic signal
input from the A / D converter 408 is minimized, and generates the reproduction signal
cancellation sound of the sound source device 128.
[0062]
The reproduction signal cancellation sound of the sound source device 128 is converted to an
analog signal by the D / A conversion unit 418, is added to the output from the traffic
information tuner 101 by the addition unit 424, and is input to the power amplifiers 102 and
103 and front speakers The reproduction sound of the sound source device 128, which is output
as sound from 104 and 105 and transmitted from the rear seat speakers 117 and 118 at the
driver's seat listening position, is reduced.
[0063]
As described above, according to this embodiment, as in the second embodiment, the traffic
information reproduction sound transmitted from the front seat speaker can be accurately
canceled at the rear seat listening position, and the sound source at the rear seat listening
position It prevents deterioration of the SN ratio of the device reproduction sound.
[0064]
Furthermore, at the same time, the mid-low range component of the sound source device
reproduced sound transmitted from the rear seat speaker at the driver's seat listening position is
canceled and reduced, thereby preventing the SN ratio of the traffic information reproduced
sound from deteriorating.
[0065]
FIG. 5 is a block diagram showing the structure of a vehicle-mounted sound reproduction
apparatus according to a fourth embodiment of the present invention.
[0066]
In FIG. 5, reference numeral 514 is a microphone for detecting an in-room acoustic signal at the
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driver's right ear listening position, 515 is a microphone for detecting an in-room acoustic signal
at the driver's left ear listening position, and 516, 517 are microphones 514, 515. And 518 and
519 are A / D converters for converting the outputs of the microphone amplifiers 516 and 517
into digital signals.
Reference numerals 512 and 513 denote A / D converters for converting the output of the sound
source equipment 128 into digital signals, and reference numerals 520 and 521 denote outputs
of the A / D converters 512 and 513 according to the outputs of the A / D converters 518 and
519. Adaptive filters whose transfer characteristics are controlled, 522, 523 are D / A converters
that convert the outputs of the adaptive filters 520, 521 into analog signals, 524, 525 are
outputs of the traffic information tuner 101, D / A converter 522 , 523 are added and selectively
output.
Reference numerals 526 and 527 are power amplifiers for amplifying the outputs of the adders
524 and 525, 528 is installed near the driver's right ear, a speaker for reproducing the output of
the power amplifier 526, and 529 is installed near the driver's left ear , And a speaker for
reproducing the output of the power amplifier 527.
A control unit 511 controls the adders 524 and 525 in accordance with the electric field strength
of the radio wave received by the traffic information tuner 101.
[0067]
First, the case where the electric field strength of the radio wave received by the traffic
information tuner 101 is weak and the traffic information can not be heard will be described.
At this time, the control means 511 performs control to turn off the switches of the adders 524
and 525, and the driver's seat, the passenger's seat, and the rear seat listen to the reproduced
sound from the sound source device 128.
[0068]
Next, the case where the electric field intensity of the radio wave received by the traffic
information tuner 101 is equal to or higher than a predetermined value and traffic information
can be heard will be described.
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[0069]
The microphone 514 detects an in-vehicle acoustic signal at the driver's right ear listening
position.
The output of the microphone 514 is amplified by the microphone amplifier 516, converted to a
digital signal by the A / D converter 518, and then input to the adaptive filter 520.
[0070]
In addition, the output of the right channel from the sound source device 128 is converted into a
digital signal by the A / D converter 512, and is input to the adaptive filter 520. The adaptive
filter 520 processes the output of the A / D converter 512 so that the square value of the invehicle acoustic signal input from the A / D converter 518 becomes minimum, and cancels the
right channel of the sound source 128 Generate
[0071]
The cancellation sound of the right channel of the sound source device 128 is converted to an
analog signal by the D / A converter 522, is added to the output from the traffic information
tuner 101 by the adder 524, and is input to the power amplifier 526. It is output, and cancels
with the reproduction sound of the sound source device 128 reproduced from the driver's seat
speaker 104 and the rear seat right speaker 117 at the driver's right ear listening position.
[0072]
The microphone 515 detects an in-vehicle acoustic signal at the left ear listening position of the
driver.
The output of the microphone 515 is amplified by the microphone amplifier 517, converted to a
digital signal by the A / D converter 519, and then input to the adaptive filter 521.
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[0073]
In addition, the output of the left channel from the sound source device 128 is converted into a
digital signal by the A / D converter 513, and is input to the adaptive filter 521. The adaptive
filter 521 processes the output of the A / D converter 513 so that the square value of the vehicle
interior acoustic signal input from the A / D converter 519 is minimized, and cancels the left
channel of the sound source device 128. Generate
[0074]
The cancellation sound of the left channel of the sound source device 128 is converted to an
analog signal by the D / A converter 523, is added to the output from the traffic information
tuner 101 by the adder 525, is input to the power amplifier 527, and is acoustically output from
the speaker 529 It is output, and cancels with the reproduction sound of the sound source device
128 reproduced from the front passenger seat speaker 105 and the rear seat left speaker 118 at
the left ear listening position of the driver.
[0075]
As described above, according to the present embodiment, the cancellation sound of the
reproduction sound of the sound source device at the driver's seat is generated and reproduced
together with the reproduction sound of the traffic information by the driver's dedicated speaker.
Therefore, it is possible to clearly transmit only the reproduction sound of traffic information to
the driver.
Furthermore, passengers other than the driver can listen to the reproduced sound of the sound
source device 128 clearly.
[0076]
As described above, according to the present invention, (1) at least one front seat speaker, at
least one rear seat speaker, a first sound source device, a second sound source device, and a low
pass filter unit A transmission characteristic correction unit, and when listening to the
reproduction sound of the first sound source device in the front seat, the reproduction sound of
the first sound source device transmitted from the front seat speaker in the rear seat can be
reduced; It is possible to realize an on-vehicle sound reproduction device with a simple
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configuration that does not cause troubles in conversations and the like.
[0077]
(2) at least one front seat speaker, at least one rear seat speaker, a first sound source device, a
second sound source device, a microphone, a low pass filter portion, and an adaptive filter
portion; The reproduced sound of the first sound source device transmitted from the front seat
speaker at the rear seat listening position is controlled to the above (1) by controlling the
transfer characteristic of the adaptive filter unit based on the detected signal to generate
cancellation sound. It is possible to realize an on-vehicle sound reproducing device that can be
canceled with high accuracy with a simple configuration.
[0078]
(3) At least one front seat speaker, at least one rear seat speaker, a first sound source device, a
second sound source device, a first microphone, a first low pass filter unit, and a first A
reproduced sound from the second sound source device transmitted from the rear seat speaker
at the front seat listening position, including an adaptive filter unit, a second microphone, a
second low pass filter unit, and a second adaptive filter unit At the same time, by canceling the
reproduction sound from the first sound source device transmitted from the front seat speaker at
the rear seat listening position, it is possible to improve the SN ratio of the reproduction sound of
each of the front and rear seats. An excellent on-vehicle sound reproducing apparatus can be
realized.
[0079]
(4) first speaker, second speaker, first sound source device, second sound source device, first
microphone, first adaptive filter, first adder, first By providing the two microphones, the second
adaptive filter, the second adder, and at least one speaker for reproducing the output of the
second sound source device, the reproduced sound from the second sound source device at the
driver's seat can be obtained. A cancellation sound is generated, and the cancellation sound is
reproduced together with the reproduction sound of the first sound source device by the first
speaker and the second speaker dedicated to the driver.
As a result, the reproduced sound from the second sound source device can be canceled at the
driver's seat, and the driver can be reproduced without degrading the SN ratio of the reproduced
sound from the first sound source device. It is possible to provide a high-performance in-vehicle
sound reproducing apparatus with a simple configuration that allows the passenger to clearly
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hear the reproduced sound from the second sound source device.
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