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JPS61182397

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DESCRIPTION JPS61182397
[0001]
Industrial Application Field of the Invention The present invention makes it possible to eliminate
the left-right imbalance of stereo reproduction sound caused by the difference in the seating
position of the occupant, and to obtain clear sound images in which each occupant is localized
forward and center front. The present invention relates to a vehicle acoustic device. The
conventional six-speaker system shown in FIG. 5 is put to practical use as a conventional vehicle
acoustic device. Front-seat speakers 3 & 3b are disposed facing the rear on both sides of the
instrument panel 2 forming the front wall of the passenger compartment space l, and relative to
the rear doors 5a and 5b. A rear seat speaker 4 &, 4b is disposed facing the same. Each of the
seat speakers aa, ab, sa, 5brt and the middle / high tone range can be reproduced, and the rear
parcel shelf 6 is provided with low sound speakers 7a, 7b. The audio signals of the left and right
channels are inputted through the respective seat speakers 3a, 3b, 5a−, sb + = h, a cathet deck
(not shown), a tuner, and an amplifier, and the low sound speakers 7a and 7b The low range
component of the channel is input. And the above-mentioned amplifier: Two balancers are
operated to control the output sound pressure of each seat speaker 3a, 3b, 5a, 5b. Balance
adjustment independent on the front seat ga, 8b and each seat 9gIII Can do. The directional
speakers 3a and 3b are disposed in front of the front seats ga and 8b and the rear seats 9 in the
middle and high tone ranges, respectively. 5a, 5b Since they are radiated, the sound image can be
localized in front of the occupants of each seat. Problems to be solved by the invention However,
in such a conventional vehicle river noise: # device, for example, when the occupant M4 ° M, M
、 1 is seated on the front and rear seats aa, sb and c +, the front seat occupant M1 Since there
are speakers 5m and 5b near the M27D ear, the sound image moves to the side of the speakers
5a and 5b, and even if the balancer is controlled, both occupants M1. It would be impossible for
M2 to simultaneously obtain a balanced stereo reproduction sound. The rear seat occupant M3
also has left and right speakers 3a. Since the distances from 5a, 3b and 5b are different, it is not
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possible to obtain stereo feeling when reproducing equal volume from each speaker, and
increase the volume of speaker 5b to obtain stereo feeling. , Front seat occupant M1. The sound
image of M2 will shift to the back. When a plurality of occupants are seated, the balancers are set
in the neutral position and the speakers 3a, 3b, 5a are located.
The playback was performed at the same volume from 5b, and it was the case that it was not
possible to obtain a stereo right-to-left balance and forward-localized stereo playback sound that
is optimal for any passenger. Means for Solving the Problems In order to solve the abovementioned problems, according to the present invention, in the passenger compartment space in
which a front seat and a rear seat on which a plurality of occupants can sit can be arranged side
by side, A pair of front seat side speakers and a rear seat are provided on both sides of the front
single room equal to the front seat occupant in the room space and on both sides of the front
cabin side distant from the rear seat occupant. The front speaker center speaker and the rear
seat center speaker are disposed in the center of a single room between the side speakers and
equidistant from each seat occupant, and the acoustic signal output device Attenuation
processing means is provided to attenuate the listening volume for the front seat occupants of
the rear seat side and center speakers, and the listening volume of the front seat center and side
speakers by a predetermined amount. Channel signal of The other channel signal is input to each
center speaker. In the above-described configuration, each channel signal output from the audio
signal output device is reproduced on the side speaker and the center speaker equally spaced
forward from each seat occupant and reproduced, and each occupant is different in the seating
position. It is possible to obtain a center-localized stereo reproduction sound with well-balanced
on both side and center speakers corresponding to each independently. In addition, since both
side and center speakers are provided in front of each passenger, the sound yJ formed on both
speakers is localized in front. At this time, the listening volume for the front seat occupant of the
rear seat side and center speaker is processed by the attenuation processing means and
attenuated to a lower listening volume for the front seat side and center speaker. Therefore, it is
possible to obtain a clear frontal localization of the sound image in the front seat side and both
the center and front sides without being affected by the front seat occupant C, the rear seat side
and the center speaker. On the other hand, the rear seat side and center both speakers are
formed by the reproduction sound of the front seat side and the center both sides of the rear seat
side and the center both side speakers L for the passenger of the lower seat. Function to merely
supplement the listening pressure of the rear passenger without affecting the sound image.
Therefore, there is no difference in volume between the front seat and the rear seat, and even if
the rear seat passenger has a volume substantially equal to that of the front seat passenger, it is
clearly formed by the rear seat side and center speakers The forward localization of the sound
image can be obtained.
Embodiment An embodiment of the present invention will be described with reference to the
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drawings. That is, as shown in FIG. 2 and FIG. 2, the compartment space ll 'of the automobile 10:
front seats 8a and 8b and a rear seat 9 are juxtaposed. A front seat passenger M1 who sits in
front seats 8a and 8b. In front of M2, on both sides of the instrument panel 2, side speakers tia
for the front seats. 11 b is arranged. The front seat side speakers 11a and 11b and the occupant
M1. The M2 (7) intervals are set to equal distances as shown in FIG. 1 knee, and the tonal axes of
the side speakers lla and llb correspond to the occupants M1. It is oriented to M2. A front seat
center speaker 11e is disposed substantially at the center between the front seat side speakers
IIIL and llb. The front seat center speaker 11C and the occupant M1. A distance t1 is set at an
interval of M2, similarly to the front seat side speakers lla and llb. On the other hand, a rear seat
passenger M3 seated on both sides of the rear seat 9; In the front of M4, the rear speakers 4a
and 4b forming the side walls of the single-room space 1 are side speakers 12a for the rear seat.
12b is arranged. The rear seat side speakers 12a and 12b and the rear seat passenger M3. The
intervals of M4 are set to equal distances t2, and the main sound axis is set for each rear
passenger M3. It is oriented to M4. A rear seat center speaker 12c is disposed at the rear end of
the center console 13 substantially at the center between the rear seat side speakers 12a and
12b. The rear seat center speaker 12C and the rear seat passenger M3. At the interval of M4, the
rear seat side speaker 12 jL. As in 12 b, the distance is set to +1 + It2. On the other hand, in the
car 10, an acoustic signal output device i! Shown in FIG. 114 are provided. The audio signal
output device 14 ij, the tuner 15 and the deck 16 are provided, and the control amplifier 17 is
connected to the output side of the tuner 15 and the deck 16. The control amplifier 17 is
connected to a right channel (Rch) output circuit and a left channel (Lch) output circuit. The first
attenuator 18 is interposed in the Rch output circuit 121 C, and the first attenuator 18 is
connected to the first attenuator 18. The third power amplifier 19J is connected via a circuit
connected in parallel to the second power amplifiers 19JL and 19b and a second attenuator 20
as attenuation processing means. A circuit connected in parallel to the fourth power amplifiers
19c and 19d is connected.
In the Lch output circuit, a fifth power amplifier 19e and a circuit connected to the @ 6 power
amplifier 19fl: H via the third attenuator 21 as attenuation processing means are connected in
parallel. The first to fourth power amplifiers 19a and 19b. 19c, 19dH1 front and rear seat side
speakers Ua. 11b, 12a, 12b, the fifth power amplifier t9eh, the front seat center speaker 11e, and
the sixth power amplifier 19f, the rear seat center speaker 12c. Therefore, as shown in FIG. 1, the
Rch signal is applied to the front and rear seat side speakers lla, 11b, 12m and 12b, and the Lch
signal is applied to the front and rear seat center speakers 11c and 12c. It is configured to be
input. Next, the operation of the present embodiment according to the above configuration will
be considered with respect to the front seat occupant M1 seated on the right front seat 8a. That
is, the front seat occupant M1 is located at the front seat side speaker 11a, the front seat center
speaker 11cH, and the equal distance t1, and the other front seat side speaker 11b is separated
by a distance t1 remote distance t3. Therefore, each front seat side speaker IIIL, llb that
reproduces the same channel signal (Rc h) has the following time difference Δt until the
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playback sound reaches the front seat passenger M1. Several m8 se (1-2 m5 ec) occur. For this
reason, in response to the front seat occupant Ml and Rch playback sound, the harness effect
(preceding sound effect) is processed, and the process is radiated from the right front seat side
speaker lla tilt that arrives earlier by the time difference Δt Be done. At this time, with regard to
the Roh sound pressure of the front seat occupant Ml, the reproduction sound of the left front
seat side speaker 11b is superimposed on the reproduction sound of the right front seat side
speaker 111 and increases. Next, when considering the playback volume of the front seat center
speaker 11c, the front seat center peak peal lie for playing back the Lch signal since it does not
pass through any of the attenuators 18, 20 and 21 of the speakers 110i. Is relatively loud.
Therefore, from the front seat center speaker 11c, the loudest reproduced sound is emitted in the
speaker system according to the present embodiment. Therefore, the volume of the front seat
center speaker 11c that reproduces the Lch signal at a large volume, and the volume of the
superimposed reproduction sound of both front seat side speakers la and llb that reproduce the
Rch at a medium volume It is possible to obtain a stereo reproduction sound that is balanced
centered on the occupant M1 and left and right balanced and centered at the occupant on the
front seat M1.
At this time, as shown in FIG. 1, the rear seat side speaker 12m is disposed close to the rear seat
ta at a distance ta (<Lt) of the front seat passenger M1. The sound emitted from the JL is required
to avoid the influence on the sound image formed in the front seat side and the center both
speakers 111. 11e. However, the playback sound from the rear seat side speaker 12a is limited
to a small volume because the signal passing through the two attenuators 18 and 20, which is
apparent from the above-described configuration, is input and recollected. There is. I worked on
the front seat side. Both the left and right speakers 11 1 and 11 C are not influenced by the
sound formed by processing on the left and right rear speakers 12 a and the left and right
speakers il 1. Position clearly between lie. For this reason front seat crew M! l-j, left and right
balanced stereo reproduction sound, front side speaker and center both speakers Ua. It is
possible to obtain an ideal sound image localization that is localized forward in the middle of 11
c, that is, in front of oneself. Of course front left passenger M! Even in the case of the above, it is
possible to obtain the left and right balanced stereo reproduction sound and the front-localized
sound image localization, which are processed in the same way. Next, the passenger M3 seated
on the right side of the rear seat 9 will be considered. The rear seat side speaker 12a and the
rear seat center speaker 12e are equally positioned with respect to the rear seat passenger M3,
and the equal distance t1 forward sheet is located, and further, the rear seat side speaker 12a
and the center both speakers 12a are disposed. The front seat side and the center both speakers
11 & lie are located in front of 12c. However, the passenger M3 is listened to the process C = the
side at the rear seat in close proximity to the above-described I · S effect, both center speakers
12m, 12c and the process reproduction sound being emitted C =. Therefore, the sound image
corresponding to the occupant M3, the rear seat side, and the center between the two speakers
12a and 12c are clearly localized in the center of the occupant M3, that is, in front of the
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occupant M3. With regard to the volume, the reproduction sound of the front seat side speaker
11a is additionally added to the rear seat side speaker 12 for reproducing the same channel
signal, and the light for the rear seat center speaker 12c is lighted. The reproduction sound of the
front seat center speaker 11e is added supplementarily. Therefore, although the reproduced
sound radiated from the rear seat side and both center speakers' L2a, 12e itself is medium
volume or small volume as described above, the front seat 8m is also used as the listening sound
pressure in the Hffl seat 9911, An amount of f substantially the same as 81111 can be obtained.
There is no difference in volume between the front seat 8m and the 8b side and the rear seat
91β ■, and it is possible to obtain an excellent stereo soundness and excellent forward
localization of the sound image with equal volume. It is possible. FIG. 3 shows the @ 2
embodiment of the present invention, in which a telelay unit is used as the attenuation
processing means. That is, the attenuator 1B and the third one. A first delay unit 22 as an
attenuation processing means is interposed between the fourth power amplifiers 19c and 19d,
and a second delay unit 23 is interposed between the control amplifier 17 and the sixth power
amplifier 19f. ing. ! 1.1G2 remote unit 22.2: 1 j, custom-designed to give equal delay time to each
channel signal. In the present embodiment according to the above configuration, the rear seat
side and the center speakers 12m, 12b and 12c are connected to the front seat side and the
center speakers 11a via the first and second delay units n and 23. Each channel signal delayed
for a predetermined time is input. Therefore, the front seat occupants M, M2 are reproduced with
no delay time due to the above-described Hearth effect, and the front seat side and center dual
speakers lla, llb. The sound of u e arrives first. Therefore, from the constraints of the mounting
location, the front passenger M1. Even if the side seats 12a and 12b for rattan seats are disposed
in the vicinity of the rear of the M2, the emission sound from the side speakers 12m and 12b for
the rear seat (without being affected by noise IIL, llb, 111! During the front seat occupant M1.
The sound image can be localized in front of M2. On the other hand, on the rear seat 9 side, each
channel signal is reproduced by the rear seat side and the center speakers 12 a, 12 b and 12 c.
At this time, the reproduction sound emitted to the rear seat side and each of the center speakers
12 & 12 b and 12 e is processed with the same delay time applied to the IEI and the second tail
unit 22 and 23. Because of this, the reproduction sound hi and the passenger M3 ° K4 are
simultaneously reached. Therefore, on the rear seat side as well, between the rear seat side and
the center speakers 12 &, 12b and 12c, each of the occupants M3. The sound localized to the
center with a sense of stereo is obtained in M4. In addition, rear seat passenger M3. A sound
image can be localized without bearing in front of K4. Moreover, the rear seat side and the center
speakers 12a and 12b.
12 c> The playback sound of these is the front seat side, center speakers lla, llb, 11 (! However,
since there is no time difference and no volume difference, the same condition (two reproduced
sounds can be heard on any seat in the single room space 1). FIG. K4 shows the @ 3 embodiment
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of the present invention, in which a sound insulation board is used as the attenuation processing
means. That is, the rear seat side, center speakers 12jL, 12b, 120 vk 51 :, H1 front seat occupant
M1. A sound insulation plate 24 m + 24 b + 246 is provided to shield the radiation of the
reproduced sound to the K 2 side. In the present embodiment according to the above
configuration, the rear seat side, the center speakers 12jL, 12b, 12 (! The sound reproduced from
the above is shielded from the sound insulation plates 24 &, 24b and 24el and is prevented from
being radiated to the front seat jiLMl and K2 side. Therefore, the rear seat side and the center
speakers 12a, 12b, 12c (7) and the front seat occupant M1. The listening pressure for K2 can be
reduced, and the front seat occupant M1. M2 is not affected by the reproduced sound from the
rear seat side, both center speakers 12JL, 12b, 12cη, etc. A sound image localized in front of M2
can be obtained, and a clear sound image with a stereo feeling localized at the center between
the front seat side and center speakers 11 m and 11 b + 110 can be obtained. In the present
embodiment, K1. The rear seat side and the center speakers 12a in the process of the @ 2
embodiment. Control over the volume itself of 12b and 12c becomes unnecessary. For this
reason, the first one. In the process of the second embodiment, the attenuators 20 and 21 and
the tail units 22 and 23 become unnecessary, and a simple circuit configuration becomes
possible, and the volume of the rear seat 9 side is the same as the volume of the front seats 8m
and 8bOIIl. Or, it is possible to set more, front seat 3m. Independent volume control becomes
possible between the 8b side and the rear seat 9 side. In each of the above embodiments, the
second embodiment The third attenuators 20 and 21, or the first and second delay units 22 and
23, the rear seat side and the center speakers 12a, 12b and 12c (7) The front passenger C. M1.
Although M, l: against T6 was designed to avoid, if the attenuator and the telelay unit are used in
combination, the above-mentioned influence can be avoided more surely. As described above in
detail, according to the present invention, in the single-room space in which the front and rear
seats are juxtaposed, the side speakers reproduce the left and right channel signals equidistantly
from the occupants of each seat. The center speaker and the center speaker are arranged, and
the listening sound for the front seat occupant of the rear seat side and center speaker is
attenuated from the front seat side and the center speaker listening sound and reproduced.
L: Each seat occupant can obtain stereo reproduction sound localized at the center, balanced left
and right, on the corresponding side and center speakers individually without being affected by
the difference in the seating position. The sound image is localized forward because it is located
forward with respect to each occupant on both the side and center speakers, and at this time the
reproduction volume of the rear seat side and center speakers is attenuated, so the front seat The
occupant can obtain a clear front localization of the sound image without being affected by the
reproduced sound from the rear seat side and center speakers. Since the front seat side and
center speakers function to supplement the listening sound pressure of the rear seat occupants,
the front seat side and center speakers function to compensate for the listening sound pressure.
As in the case of the seat occupants, it is possible to obtain a clear sound image localization
localized forward individually, and it is possible to realize a sound field free from pressure
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sensation and fatigue in a single room space. In addition, in the embodiment shown in FIG. 3,
since the time difference processing is performed on the time difference without changing the
volume difference between the front seat speakers and the rear seat kettle speaker. The front
seat side and the rear seat side can be made 1 Krl-hearing sound pressure, and all the occupants
can hear the reproduced sound under the same condition. Further, in the embodiment shown in
FIG. 4, since the sound insulation plate is used, it can be put to practical use at low cost, and
independent sound control can be performed on the front seat side and the rear seat side. It is a
thing.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is an
explanatory plan view showing a speaker layout tIt structure of the embodiment, and FIG. 3 is an
explanation showing a second embodiment of the present invention FIG. 4 is a plan view showing
a third embodiment of the present invention, and FIG. 5 is a plan view showing a speaker
arrangement structure of a conventional vehicle acoustic system.
1 · · · cabin space 8a, 8b · · · front seat, 9 · · · rear seat, 11 &, 11 b · = site speaker for the front
seat, 11 c =-center speaker for the front seat, 12a, 12b ... Rear seat side speaker, 12c ... Rear seat
center speaker, 14 ... Sound signal output device, 20 ... Second attenuator (attenuation processing
means), 21 ... Third attenuator (attenuation Processing means), 22 ... il wait unit (attenuation
processing means), 23 ... second delay unit (attenuation processing means), 24a. 24b、
24(! ... Sound insulation board (attenuation processing means), M1. M2 ... front seat crew,
M3. M4 ... rear seat crew. Fig. 1 tl l l T Fig. 2 50 W 11 W Fig. 3 4 4 4 5
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