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DESCRIPTION JPH09175281

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DESCRIPTION JPH09175281
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
automatic volume device, and more particularly to an automatic volume device that detects
ambient noise and automatically adjusts the volume in response to the noise.
[0002]
2. Description of the Related Art When listening to sounds such as CDs and radios in a car room,
the ease of listening to the sounds may often be modulated depending on the environment inside
and outside the car. For example, when a truck or the like is stopped next when the vehicle is
stopped, the engine sound of the truck becomes a noise and the voice is masked, so it becomes
difficult to hear the voice with the volume which has been listening so far, and the volume is
raised A need arises. Also, conversely, after the track has left, it is too high and it is annoying if
the volume is raised as it is, so it is necessary to lower it to the original volume again. Also, for
example, when the speed of the vehicle is increased while the vehicle is traveling, not only the
engine noise of the vehicle but also the road noise and wind noise become larger than before,
and the noise amount due to these increases. The need arises to raise the volume. In the opposite
case, i.e., when the speed of the vehicle is reduced, the volume needs to be reduced.
[0003]
As described above, the environment surrounding the vehicle changes from moment to moment,
and the amount of noise reaching the passenger compartment also changes accordingly, so the
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sound of a CD, radio, etc. (hereinafter referred to as a source) Note that the ease of listening is
very variable, and in order to maintain a certain ease of listening, the volume must be raised and
lowered frequently.
[0004]
Therefore, recently, an automatic volume device has been developed which automatically adjusts
the volume according to the noise amount.
[0005]
The auto volume device automatically raises the volume when the noise amount increases, and
automatically decreases the volume when the noise amount decreases. In order to detect the
noise amount, the source is configured to detect the noise amount. The integrated sound in
which sound and noise are mixed is detected by the noise detection microphone, and the
difference between the signal of the detected sound (hereinafter referred to as detected sound)
and the signal from the source is determined to detect the noise amount Is configured to
[0006]
The microphone in the conventional auto volume device is often disposed near the passenger's
listening position, such as the shoulder portion of a front seat, a pira, or the like.
This is because an attempt was made to detect the integrated sound closer to the sense of the
occupant.
[0007]
However, in the above-described auto volume device, the microphone is disposed at the
shoulders or pillars of the front seat, and these locations are likely to be affected by the reflected
sound from the source sound. Since the microphone detects the reflected sound in addition to the
source sound, the reflected sound is erroneously detected as noise even when there is no noise
(no noise).
That is, there is a problem that the output difference does not become zero even in the no noise
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state.
In this case, for example, the output difference between the source signal and the detection
sound signal always has a positive value, and the auto volume device always functions to raise
the volume more than necessary.
[0008]
The auto volume device according to the present invention has been made in view of the above
problems, and can provide the auto volume device capable of making the output difference at the
time of no noise substantially zero and improving the noise detection accuracy. The purpose is to
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, an auto volume device
according to the present invention detects an ambient noise and automatically adjusts the
volume according to the noise. The volume device is characterized in that a microphone for noise
detection is disposed in the vicinity of a center room lamp in a vehicle compartment (1).
[0010]
According to the auto volume device (1), since the vicinity of the center room lamp is at a
position where it is difficult to receive the influence of the reflected sound of the source sound,
the reflected sound is hardly added to the detected sound detected by the microphone.
Therefore, since the output difference between the signal of the detection sound and the signal of
the source can be substantially zero when there is no noise, the noise detection accuracy can be
improved.
[0011]
Further, the auto volume device according to the present invention is characterized in that a
microphone for noise detection is disposed in the vicinity of a front room lamp in a vehicle
compartment (2).
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[0012]
In the auto volume device (2), the location of the microphone is in the vicinity of the front room
lamp in the passenger compartment, so for example, a two seat type vehicle or a center such as a
vehicle such as a vehicle or truck emphasizing the front seat portion. The microphone can be
arranged even in a vehicle in which the room lamp is not or can not be arranged.
In addition, since the vicinity of the front room lamp, which is the position where it is disposed, is
a position that is less susceptible to the influence of the reflected sound, the same effect as the
auto volume device described in (1) can be obtained in the vehicle.
[0013]
Further, the auto volume device according to the present invention is characterized in that the
microphone for noise detection is disposed in the vicinity of the center portion of the front panel
in the vehicle compartment (3).
[0014]
In the auto volume device (3), the microphone can be retrofitted since the location of the
microphone is in the vicinity of the center portion of the front instrument panel which is
disposed in common to substantially all vehicle types.
That is, since the microphones can be arranged in almost all types of vehicles without being
influenced by the shape of genuine parts separately designed for each vehicle type, such as
center room lamps and front room lamps, versatility is improved, Design costs and
manufacturing costs can be reduced and vehicles to be sold can be increased.
[0015]
Further, the auto volume device according to the present invention is characterized in that the
microphone for noise detection is disposed in the vicinity of the center of the rearview mirror or
the windshield in the vehicle interior (4).
[0016]
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In the auto volume device (4), for example, the location of the microphone is near the center of
the rearview mirror or the windshield, so, for example, a center room lamp or front such as a
vehicle whose ceiling is movable or a vehicle whose ceiling is open The microphone can also be
attached to a vehicle in which a room lamp is not provided or can not be provided.
In addition, since the room mirror or the vicinity of the center of the windshield, which is the
arrangement location, is at a position hardly affected by the reflected sound, the same effect as
the auto volume device described in (1) can be obtained in the vehicle.
[0017]
The auto-volume device according to the present invention is characterized in that a plurality of
microphones for noise detection are arranged in the front-rear direction near the center line in
the front-rear direction of the ceiling surface of the vehicle interior (5).
[0018]
In the above-mentioned auto volume device (5), since the microphones are plural and the
arrangement place thereof is near the center line in the front-rear direction of the indoor ceiling
surface, for example, the vehicle length is long and sound is collected like a bus. Even in the case
of a vehicle in which the volume of the detection sound is extremely different depending on the
place, the plurality of microphones can detect the detection sound for each place and detect the
respective signals, and moreover, the location Since the vicinity of the center line in the front-rear
direction of the indoor ceiling surface is at a position that is less susceptible to the influence of
the reflected sound, the same effect as the auto volume device described in (1) above can be
obtained in the vehicle.
[0019]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the automatic
volume apparatus according to the present invention will be described below with reference to
the drawings.
FIG. 1 is a block diagram schematically showing a circuit for noise detection of the auto volume
apparatus according to the embodiment, and the solid line in the figure shows the flow of a
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signal A of a source such as a CD or a radio. The broken line indicates the flow of the sound and
noise in the vehicle interior acquired by the microphone 21, that is, the signal B of the detection
sound.
[0020]
In the figure, 10 shows a vehicle interior, and in the vehicle interior 10, a speaker 14 for emitting
source sound and a microphone 21 for noise detection are installed.
The source 14 is connected to the speaker 14 through the power amplifier 13 and the
preamplifier 12, and the signal A emitted from the source 11 is voltage amplified in the
preamplifier 12, and the frequency characteristic and the volume are adjusted to a desired state.
It is sent to the amplifier 13.
In the power amplifier 13, the signal A arranged by the preamplifier 12 is amplified to a power
sufficient to drive the speaker 14, and the amplified signal A passes through the speaker 14 and
is emitted as a source sound to the vehicle interior 10. It has become.
[0021]
A monaural unit 15 is connected between the preamplifier 12 and the power amplifier 13 for
converting the signal A after passing through the preamplifier 12 into monaural. The signal A
converted into monaural by the monaural unit 15 is predetermined by the band pass filter 16.
After being taken out of only the frequency components of R.sub.1. Thereafter, the integrated
value is taken by the integrator 18 and then taken into the output difference measuring circuit
19.
[0022]
On the other hand, the microphone 21 is also connected to the band pass filter 16 via the
microphone amplifier 22 and the equivalent transfer circuit 23, and the signal B of the detection
sound taken in by the microphone 21 is amplified by the microphone amplifier 22 and amplified.
B is taken into the band pass filter 16 via the equivalent transfer circuit 23. The flow of the signal
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B from the band pass filter 16 to the output difference measuring circuit 19 is the same as that
of the signal A, and the output difference measuring circuit 19 obtains the output difference
between the signal A and the signal B. The output difference measurement circuit 19 is
connected to the detector 24, and the calculated output difference is detected as the amount of
noise by the deflection of the hand of the detector 24.
[0023]
FIG. 2 (a) is a schematic side sectional view of a vehicle showing the location of the microphone
21 of the auto volume device according to the embodiment, and FIG. 2 (b) is a schematic partial
enlarged perspective view of the vehicle interior.
[0024]
The vehicle is a general vehicle with four to five passengers, in which the front seat 32 and the
rear seat 33 are disposed in the passenger compartment 10.
A room mirror 35 is disposed near the center of the windshield 34 of the vehicle interior 10, and
a front room lamp 36 is disposed in front of the ceiling surface 10a of the vehicle interior 10 and
near the room mirror 35. , And mainly illuminate the vicinity of the front seat 32. Further, a
center room lamp 37 is disposed substantially at the center of the ceiling surface 10a so that the
vicinity of the front seat 32 and the rear seat 33 can be illuminated. A front instrument panel 38
is disposed below the windshield 34 and in front of the front seat 32, and a storage box unit, a
CD unit, a deck unit such as a radio, and an operation unit are disposed below the front
instrument panel 38. There is. In addition, a pillar 39 is formed at the center of the side surface
of the vehicle 30.
[0025]
In the automatic volume device 1 according to the first embodiment, the microphone 21 is
disposed in the vicinity of the center room lamp 37. Since the vicinity of the center room lamp
37 is at a position where it is difficult to receive the influence of the reflected sound from the
source, the reflected sound is hardly added to the detected sound detected by the microphone 21
and the signal by the detected sound and the signal by the source sound when there is no noise
Therefore, the noise detection accuracy can be improved because the difference between the
output and the output can be made substantially zero.
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[0026]
In the automatic volume device 2 according to the second embodiment, the microphone 21 is
disposed in the vicinity of the front room lamp 36. For example, vehicles such as two-seat type
vehicles and vehicles and trucks that emphasize the front seat 32 portion are often not provided
with the center room lamp 37 or can not be provided. If the location 21 is near the front room
lamp 36, it is possible to place the microphone 21 and the vicinity of the front room lamp 36 is a
position which is less susceptible to the influence of the reflected sound. Therefore, according to
the auto volume device 2, the same effect as that of the auto volume device 1 can be obtained in
the above-described vehicle.
[0027]
In the auto volume device 3 according to the third embodiment, the microphone 21 is disposed
at the center of the front instrument panel 38. The central portion of the front instrument panel
38 is a portion that is shared by substantially all types of vehicles, so that it is possible to retrofit
the existing microphone 21. In other words, since the existing microphones 21 can be arranged
in almost all types of vehicles regardless of the shapes of genuine parts separately designed for
each vehicle type, such as the center room lamp 37 and the front room lamp 36, versatility is
improved. Design cost and manufacturing cost can be reduced and the number of vehicles to be
sold can be increased.
[0028]
Further, in the auto volume device 4 according to the fourth embodiment, the microphone 21 is
disposed at the center of the rearview mirror 35 or the windshield 34. For example, vehicles
having movable ceilings and vehicles having open ceilings are often not provided with the center
room lamp 37 and the front room lamp 36 or can not be provided. Although it is difficult to place
the microphone 21, it is possible to place the microphone 21 if it is at the center of the rearview
mirror 35 or the windshield 34. In addition, the vicinity of the center of the rearview mirror 35
or the windshield 34 is a position which is not easily affected by the reflected sound. Therefore,
according to the auto volume device 4, the same effect as that of the auto volume device 1 can be
obtained even in the above-described vehicle.
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[0029]
Further, in the auto volume device 5 according to the fifth embodiment, a plurality of
microphones 21 are arranged in the front-rear direction near the center line in the front-rear
direction of the ceiling surface 10 a of the vehicle interior 10. For example, in a vehicle such as a
bus having a long vehicle length, the volume of the detection sound collected is often extremely
different depending on the place, but according to the auto volume device 5, the detection for
each place by the plurality of microphones 21 It becomes possible to detect the sound and detect
the signal from each, and the position near the center line in the front-rear direction of the
indoor ceiling surface 10a, which is the location thereof, is hardly affected by the reflected
sound. Also in the vehicle, the same effect as in the case of the automatic volume device 1 can be
obtained. Further, the adjustment of the volume may be uniformly performed on all the speakers
14 based on the average value of the noise amount detected for each detection location, or each
speaker 14 disposed at a predetermined location in the longitudinal direction of the vehicle The
volume may be adjusted automatically.
[0030]
Examples and Comparative Examples As an example, when the microphone 21 is disposed in the
vicinity of the center room lamp 37 (Example 1) and disposed in the vicinity of the front room
lamp 36 (Example 2), disposed in the central portion of the front instrument panel 38 A
comparison was made between the signal A of the source sent from the integrator 18 to the
output difference measurement circuit 19 and the signal B of the detection sound for each of the
cases (Example 3).
[0031]
Further, in the case where the microphones 21 are arranged in the pile 39 (comparative example
1) and in the case where they are arranged in the center seat right shoulder portion 40
(comparative example 2) as a comparative example, the respective signals A and B are similarly
compared. The
[0032]
FIGS. 3 to 5 are graphs showing the results of the comparison in Examples 1 to 3 and FIGS. 6 and
7 in Comparative Examples 1 and 2. FIG.
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The horizontal axis of the graph indicates time (seconds), and the vertical axis indicates voltage
values (mV) of the signals A and B sent to the output difference measurement circuit 19.
[0033]
In any of the graphs of FIGS. 3 to 7, in the no noise state, a change in voltage for 0.2 seconds is
taken before and after the sound is emitted from the source 11.
Assuming that the time when the voice from the source 11 starts to be emitted is T1 to T5
respectively corresponding to Examples 1 to 3 and Comparative Examples 1 and 2, T1 to T5
correspond to the signal A in any of the examples and the comparative examples. , B are identical
at the level p, the graphs overlap and the output difference is zero. After T1 to T5, the voltage
indicated by the signal B rises with the voltage indicated by the signal A, and the signals A and B
settle at substantially constant voltages at t1 to t5.
[0034]
Here, according to the auto volume devices 1 to 3 according to the first to third embodiments,
the signal A reads the signal B between T1 and t1, between T2 and t2, and between T3 and t3.
Thereafter, the voltages indicated by the signal A and the signal B have one value near the level
q, and the graphs substantially overlap. On the other hand, according to the auto volume
apparatus according to Comparative Examples 1 and 2, the signal A reads the signal B between
T4 and t4 and between T5 and t5 as in the first to third embodiments. After t4 and t5, although
the noise-free state continues, the voltage value indicated by the signal B becomes higher than
the voltage value indicated by the signal A with a substantially constant width.
[0035]
As is clear from the above results, in the auto volume device according to Comparative Examples
1 and 2, the microphone 21 is disposed on the pill 39 and the center seat right shoulder portion
40, so the reflected sound in addition to the source sound Is included in the detection sound, and
even when the output difference obtained by subtracting the source sound without noise is
calculated, it does not become zero but always becomes a positive value. On the other hand, in
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the auto volume devices 1 to 3 according to the first to third embodiments, the microphone 21 is
disposed in the vicinity of the center room lamp 37 or in the vicinity of the front room lamp 36
or in the center of the front instrument panel 38. It is difficult to pick up the reflected sound, and
only substantially the source sound is detected as a no-noise detection sound, and the output
difference can be made zero. Therefore, the noise detection accuracy could be improved.
[0036]
Brief description of the drawings
[0037]
1 is a block diagram schematically showing a circuit for noise detection in the automatic volume
device according to the embodiment of the present invention.
[0038]
FIG. 2 (a) is a schematic side sectional view showing the arrangement location of the microphone
for noise detection of the auto volume device according to the embodiment, and FIG. 2 (b) is a
schematic partial enlarged perspective view thereof.
[0039]
3 is a graph showing a result of comparison between a signal of a source and a signal of a
detection sound in the auto volume device according to the embodiment of FIG.
[0040]
FIG. 5 is a graph showing the result of comparison between the signal of the source and the
signal of the detection sound in the auto volume device according to the embodiment of FIG. 4.
[0041]
FIG. 5 is a graph showing a result of comparison between a signal of a source and a signal of a
detection sound in an auto volume device according to still another embodiment.
[0042]
6 is a graph showing the result of comparison of the signal of the source and the signal of the
detection sound in the auto volume device according to the comparative example.
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[0043]
FIG. 8 is a graph showing the result of comparison between the signal of the source and the
signal of the detection sound in the auto volume device according to the comparative example of
FIG. 7.
[0044]
Explanation of sign
[0045]
1, 2, 3 Auto volume device 16 Microphone (for noise detection) 10 Car interior 10a Ceiling
surface 34 Front glass 35 Room mirror 36 Front room lamp 37 Center room lamp 38 Front
instrument panel
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