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DESCRIPTION JPH04207499

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DESCRIPTION JPH04207499
[0001]
[Summary] The present invention is an on-vehicle sound field control apparatus in which a sound
effect signal for generating a sense of expansion of a music hall is superimposed on a low range
signal of a rear speaker of a rear seat. It is possible to save dedicated auxiliary speakers for
securing a feeling. BACKGROUND OF THE INVENTION 1. Field of the Invention The present
invention relates to a sound field control apparatus for obtaining a sense of expansion of a music
venue. In particular, the present invention refers to the improvement of an on-vehicle sound field
control device which can provide a sense of expansion at any seat in a car and can reduce the
installation of new speakers. PRIOR ART FIG. 7 is a view showing a first conventional sound field
control apparatus. The same components are denoted by the same reference numerals or
symbols throughout the drawings. In the configuration of this figure, front speakers 1-2 and 1-3
of the front seat, middle speakers 2-1 and 2-2 of the front seat and rear seat, and rear speakers
3-1 of the rear seat with respect to the car seat. And 3-2, the bass range filter 4 connected to the
rear speakers 3-1 and 3-2 of the rear seat, and the front speakers 1-2 and 1- of the front seat
with respect to the stereo signals (L, R). 3 and fader-8 which balances the volume between the
middle speakers 2-1 and 2-2 of the front seat and the rear seat and connected to the input side of
the bass range filter 4 and adds stereo signals (L, R) The mixing part 9 to mix and mix is
included. The fader 8 will be described in the order of the embodiments. Next, the operation will
be described. スピーカ1−2、1−3。 A sound field with a similar sense of forward
localization is created at the front seat and the rear seat of the vehicle interior by the two-speaker
systems of 2-1.2-2.3-1 and 3-2. In this system, speakers 1-2 (sometimes an instrumental panel in
the case of the front) are mounted to obtain frontal and rear seats in front of each other, 1-3. 1-2.
2 The normal 2-channel stereo signal is reproduced by -2. Only the following bass is reproduced
by the bass filter 4 from the speaker 3-1. 3 in the rear tray to 100 to 150 with little sense of
direction, and the speaker 3-1. 3-2 is further driven using the trunk room By improving the sex, a
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rich bass can be produced, and using the fader-8, forward localization can be obtained at any
seat. By the way, there is known a vehicle interior sound field control apparatus in which a
technology for causing a sense of expansion of a music venue is further added to the abovedescribed conventional technology. FIG. 8 is a diagram showing a second conventional sound
field control apparatus. The component different from that of FIG. 7 in this figure is that the
speakers 2-1 and 2-2 are used as the dedicated speakers for generating a sense of expansion, and
the auxiliary speaker 1-1 is newly provided.
A sound effect creation unit 5 for generating a sound effect having a sense of expansion is
connected to the output side of the mixing unit 9 with respect to the speaker 1-1.2-1.2. Since the
speakers 2-1 and 2-2 are dedicated speakers for generating a sense of expansion, there is no
need to balance the volume between the front seat and the rear seat, and the 7 ader 8 is not
necessary. The creation of sound effects 85 will be described in the section of the embodiment.
[Problem to be solved by the invention] However, in the second conventional sound field control
device, as aimed for the front seat, it is held by the speaker 1-1. Although a sense of expansion
can be obtained, there is a problem that for the rear seat, the sound effects are reproduced only
from the front and a sense of expansion to the rear can not be obtained. If the speakers 3-1 and
2-2 are replaced with the dedicated speakers that cause the speakers 3-1 right and 2-2 to have a
sense of expansion, the bass range is weakened. For this reason, one or more auxiliary speakers
are placed next to the speakers 3-1 and 3-2 of the rear tray woofer to reproduce the sound
effects, and a sense of expansion in the rear seat is secured. A large number of auxiliary speakers
and an amplifier system for driving the same are required, resulting in an increase in cost.
Therefore, in view of the above problems, the present invention provides an on-vehicle sound
field control device capable of obtaining the same sense of expansion in the front and rear seats
of the vehicle without adding a new auxiliary speaker to the rear side. The purpose is [Means for
Solving the Problems] FIG. 1 is a view showing the principle of the present invention. In order to
solve the above-mentioned problems, the present invention superimposes a sound effect signal
from the sound effect generation unit 5 on at least a bass range signal of the rear speaker 3 in
the rear seat in the in-vehicle sound field control device. [Operation] In FIG. 1, according to the
vehicle-mounted sound field control device of the present invention, the front speaker 1 and the
middle speaker 2 form a sense of front localization to the front seat and the rear seat, Sound
effect is created by the speakers looking into the front and back seats, but the sound effect signal
is superimposed on the bass range signal of the rear speaker 3 that has the bass and receives the
bass This eliminates the need for a conventional auxiliary speaker dedicated to creating sound
effects, thereby reducing costs. Further, if the sound effect signal is superimposed on the front
speaker 1, a dedicated auxiliary speaker becomes unnecessary. Embodiments of the present
invention will be described in detail with reference to the drawings. FIG. 2 is a view showing a
vehicle-mounted sound field control apparatus according to a first embodiment of the present
invention.
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The configuration of this figure will be described. The vehicle-mounted sound field control device
shown in the figure is composed of an auxiliary speaker 1-1 attached to the front instrumental
panel, and 2 and 1-3 attached to the speakers attached to the right and left of the front door,
respectively. A front speaker 1 for the front seat with respect to the seat, an intermediate speaker
2 for the front and rear seats consisting of speakers 2-1 and 2-2 attached respectively to the
right and left of the rear door portion, and a rear tray portion attached to the rear tray portion as
a pack cavity , A rear seat speaker 3 for bass range reproduction, and a bass range filter 4
connected to the rear speaker 3 and passing only a bass range signal among input signals And D
/ A (Digital-Analog Converter) converter, power amplifier not shown D / A conversion (not
shown) between the sound effect creating unit 5 connected to the auxiliary speaker 1-1 and
reproducing the sound field in the music hall, the speakers 3-1 and 3-2, and the low-pass filter 4
Adders 7-1 and 7-2 provided via a power amplifier, for adding so that the sound effect signal
from the sound effect creating unit 5 is superimposed on the low frequency band signal of the
low frequency band filter 4; With regard to stereo human power signals (VL, VR), D / A
converters and powers (not shown) for balancing the volume between the speakers 1-2 and 1-3
and the speakers 2-1 and 2-2. The mixer 8 includes a fader 8 provided via an amplifier, and a
mixer 9 for adding and mixing stereo input signals and outputting the result to the low-pass filter
4 and the sound effect generator 5. Here, the low pass filter 4 is provided to reproduce only low
tones of 100 to 1507 by the rear speaker 3. By the way, as a characteristic newly required for
the rear speakers 3-1 and 3-2, it is sufficient if the frequency band of the sound effect for
obtaining a feeling of expansion of the sound field is up to 8 or so, a band of this degree
Although it is necessary to have a response up to, it is sufficiently feasible. Further, the sound
effect creating unit 5 is composed of D S P (Digital Slgnal Processor), and reproduces a sound
effect that generates an expansive feeling of the sound field created by initial reflection sound,
reverberation sound, etc. to reproduce the sound field of the music venue. Do. FIG. 3 is a diagram
showing the configuration of the sound effect creation unit of FIG. This figure shows an initial
delay memory 51 that delays the direct sound signal by 78 hours and 12 hours, and a delay
memo that receives the direct sound signal delayed by T1 time!
752-1, a plurality of multipliers 52-2 for multiplying a certain coefficient for each signal delayed
by this delay memo 1J 52-1, and, for example, every other output of the plurality of multipliers
52-2 Initial reflected sound generator 52 comprising a plurality of adders 52-3 forming right (R)
and left (L) signals for stereo, and a delay for delaying the direct sound signal delayed by 12
hours by 61 hours Device 53-1, a multiplier 53-2 for multiplying the signal of the delay device
53-1 by a certain coefficient, and an output signal of the multiplier 53-2 and an input signal of
the delay device 53-1 It comprises an adder 53-3 and a delay unit 53-4 which branches the
output signal of the delay unit 53-1 and delays it for a predetermined time to form right (R) and
left (L) signals for stereo. Reverberation sound generation unit 53, the initial reflection sound
generation unit 52, and the remaining It includes an adder 54-1 and 54-2 for adding the right for
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stereo sound generation unit 53 (R) and left side (L) signal, respectively. Although either one of
the adders 54-1 and 54-2 may be output to the auxiliary speaker 1-1, the output of the initial
reflected sound generation unit 52 by the adder 55 as shown in FIG. The signals may be added,
and the added signal may be added to the output signal of the adder 54-1 by the adder 56 and
output. FIG. 4 is a diagram for explaining a sound field generated by the sound effect creating
unit of FIG. 3; The early reflections and reverberations shown in the figure reproduce different
senses of spread, such as concert halls, live houses, churches, and stadiums. The initial reflection
sound generation unit 52 and the reverberation generation unit 53 generate signals having two
types of differences in delay, and reproduce the difference in reflection from the right side wall
and the left side wall of the music venue with the right and left signals. It is also formed to create
a sense of stereo. FIG. 5 is a diagram showing the configuration of the fader of FIG. This figure is
linked to the left signal (L> equally divided into resistors 81 and 82 for the left side of the stereo,
and the resistors 83 and 84 similarly divided equally for the right signal (R), and to each divided
signal Weights to form left (L) front and rear seat signals (PL, RL) and right (R) front and rear
seat signals (PR, RR) forming resistors 85 and 86 And. This fader 8 is adjusted so that the sound
image localization feeling of the front seat and the rear seat is always forward. This is because
the sense of sound localization at the music venue is in front of the audience. In addition, since
the rear speaker 3 has a sound intensity of 100 to 1507 or less, the feeling of localization of the
sound image is small.
Next, a series of operations of this embodiment will be described. When a stereo signal is input, it
is reproduced by the speaker 1-2.1-3.2-1.2-2 so that a sound image localization feeling can be
obtained in front of the front and rear seats by the fader-8, and the mixing unit 9 The bass is
reproduced by the rear speaker 3 through the bass filter 4. The sound effect signal reproduced
by the sound effect generating unit 5 is superimposed on the auxiliary speaker 1 and further on
the low range signal of the low range filter and output to the rear speaker 3. Therefore, the front
seat and the rear seat are squeezed by the auxiliary speaker 1-1 and the rear speaker 3 to
reproduce the sound effects, so that a feeling of expansion of the music venue can be obtained.
Since the rear speaker 3 reproduces and reproduces both the bass and the sound effects, it is not
necessary to newly provide an auxiliary speaker for sound effects. Therefore, according to the
present embodiment, when the auxiliary speaker for the effect sound is provided, an amplifier
system for driving the speaker is required accordingly, and the expected problem of an increase
in cost can be solved. FIG. 6 is a view showing a vehicle-mounted sound field control apparatus
according to a second embodiment of the present invention. What differs from the components
of FIG. 2 in this figure is that, in this figure, a sound effect signal is superimposed on a
conventional signal instead of the auxiliary speaker 1-1 of FIG. 2 to reproduce a human power
signal. Speakers 1-2 and 1-3 in front of the seat. Therefore, an adder is added so that the left (L)
and right (R) output signals of the sound effect creating unit 5 are added to the left (L) and right
(R) output terminals of the front seat of the fader-8. 10-1 and 10-2 are provided. According to
this embodiment, the auxiliary speaker 1-1 can be saved compared to the first embodiment.
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[Effects of the Invention] As described above, according to the present invention, since the sound
effect signal that causes the expansion of the music hall is superimposed on the low range signal
of the rear speaker of the rear seat, the rear side of the rear seat can It is possible to save
dedicated auxiliary speakers for securing a sense of expansion.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows the principle of the present invention, FIG. 2 shows an on-vehicle sound field
control apparatus according to the first embodiment of the present invention, and FIG. 3 shows
the sound generation unit of FIG. 4 shows the configuration of the sound field generated by the
sound effect creation unit of FIG. 3, FIG. 5 shows the configuration of the frame of FIG. 2, FIG.
FIG. 7 shows an on-vehicle sound field control apparatus according to a second embodiment of
the present invention, FIG. 7 shows a first conventional sound field control apparatus, and FIG. 8
shows a second conventional sound field It is a figure showing a control device.
In the figure, 1 · · · front speakers, 2 · · · intermediate speakers, 3 · · · rear speakers, 4 · · · · · · · · · · ·
· · sound effect creation unit. Diagram showing the principle configuration of the present
invention 101: front speaker 2 of front seat 2 middle speaker 3 of front seat and rear seat 3 rear
speaker of rear seat 6.7 adder 1 direct sound Initial reflected sound Fig. 4 illustrates the
configuration of the faders of Fig. 2 and Fig. 2 illustrates the first sound field control device of
the prior art 1 Fig. 7 illustrates the second sound field control device of the prior art f;
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