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JPH04256300

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH04256300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field control apparatus for outputting direct sound, early reflection sound and
reverberation sound from a plurality of speakers to obtain an auditory feeling such as in a
concert hall, etc. A listening range in which a particularly good hearing can be obtained
(hereinafter referred to as a listening range). The present invention relates to a sound field
control device in which the listening range is provided in the room, for example, in two places.
[0002]
2. Description of the Related Art A sound field control device, in which many speakers are
installed and different signals are outputted from each other, so that even in a normal room or a
car, a user can feel as if they were in a concert hall. There is an audio system. This is a direct
sound transmitted directly as shown in FIG. 5 when measuring the sound from the playing point
at a listening place such as a concert hall, an initial reflection wave group mainly due to the first
reflection mainly on the left and right side wall surfaces, and a plurality It is possible to obtain a
high-order reflected wave group that is transmitted over a longer period of time while repeatedly
attenuating the reflection, and measuring each of them to create a signal that produces a similar
acoustic effect from the acoustic signal, It is output from the speaker. Usually, the initial reflected
wave group is called an initial reflected sound, and the high-order reflected wave group is called
a reverberation sound.
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[0003]
In high-end audio systems, the number of speakers may be very large, but in general, as shown in
FIG. 6, the direct sound, the early reflection sound and the reverberation sound each have two
left and right speakers, ie, two overall speakers. The system consists of six speakers. In such a
sound field control device, as shown in FIG. 6, a listening range 8c is determined, and a desired
sound field is created in that range.
[0004]
Signals for generating early reflections and reverberations are referred to as digital signal
processors (hereinafter referred to as DSPs). Is generally generated from an acoustic signal
corresponding to direct sound by a digital filter circuit using. An example of a digital filter circuit
for generating an initial reflection sound signal and a reverberation sound signal is shown in FIG.
FIG. 7 (a) is a digital filter circuit for generating an initial reflected sound signal from a direct
sound signal referred to as a fit impulse response filter. FIG. 7B is referred to as an infinite
impulse response filter, and is a circuit for generating a reverberation sound signal from a direct
sound signal.
[0005]
In the sound field control device, many configurations are conceivable by taking a form of mixing
a plurality of sounds such as direct sound and initial reflection sound from the number of
speakers used and one speaker. However, direct sound must always be output from the front,
and in general, early reflections are also output from the front, and reverberant sound is output
from the rear. Even in systems with many speakers, one or two direct sound speakers are used,
and the listening range is limited.
[0006]
In recent years, such a sound field control apparatus has been used in automobiles to realize a
good music environment. In the case of a car, it is common to place speakers for direct sound
and early reflections at the front of the car and a speaker for reverberation at the rear, because
the parts where the speakers can be placed are limited. It is.
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[0007]
As shown in FIG. 6, the sound field controlled by the sound field controller is a listening range 8c.
Therefore, at positions other than the listening range, sufficient sound quality may not always be
obtained. In particular, at a position close to the reverberation sound speaker 4c, the ratio of the
reverberation sound relatively increases, resulting in a muffled and unclear sound. This means
that the listening range in the room is limited, which becomes a big problem as the number of
listeners increases.
[0008]
Furthermore, space is limited particularly in the interior of a car, and since the front and the rear
are separated by the upper seat etc., in all positions including the driver's seat, the passenger seat
and further the rear seat. It is very difficult to obtain sound quality above a certain level.
Therefore, the front seat including the driver's seat is usually set to be in the listening range.
However, there is a problem that the person in the back seat will hear the sound of insufficient
sound quality.
[0009]
The present invention has been made in view of the above problems, and it is an object of the
present invention to expand the listening range in a sound field control device, and in particular,
in a sound field control device of a car But it aims to be able to hear good sound.
[0010]
SUMMARY OF THE INVENTION In the sound field control apparatus of the present invention, in
order to solve the above-mentioned problems, a speaker for outputting reverberant sound toward
the front and a rear for the center top of the room. The listening range is expanded by providing
a speaker that outputs the direct sound and the early reflection sound.
FIG. 1 is a diagram showing a basic arrangement of speakers in a sound field control apparatus
according to the present invention. In the drawings, portions having similar functions are
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denoted by the same reference numerals, and letters other than those in FIG.
[0011]
That is, the sound field control device of the present invention is provided at the front of the
room 1 and is provided at the front of the room 1 with the front direct sound speaker 2 for
outputting direct sound toward the rear of the room 1. Speaker 3 for outputting an initial
reflected sound toward the rear of the room 1, and a speaker 4 for a rear reverberation sound
provided at the rear of the room 1 and outputting a reverberation toward the front of the room 1
And a central reverberation speaker 5 provided at the upper center of the room 1 and outputting
reverberation toward the lower front of the room 1, and a rear of the room 1 provided at the
upper center of the room 1. It is a sound field control device characterized by including a central
direct sound initial reflected sound speaker 6 outputting a direct sound and an initial reflected
sound toward the lower part, and extending a good listening range.
[0012]
The good sound quality can be obtained only when the direct sound, the early reflection sound
and the reverberation sound are balanced.
Therefore, at positions other than the listening range, these balances are broken and the sound
quality is degraded. That is, in front of the listening range, the ratio of the direct sound and the
early reflection sound increases, and the reverberation sound runs short. And in the back of the
listening range, the ratio of reverberation increases, and the direct sound and the early reflection
sound run short. Therefore, in order to extend the listening range back and forth, it is sufficient
to compensate for the missing type of sound in each part.
[0013]
However, as described above, the direct sound needs to come from the front, and the system is
configured such that the early reflection sound and the reverberation sound also come from the
front and the rear, respectively. Therefore, it is not possible to extend the listening range to the
rear, for example, by outputting a direct sound in front of the speaker behind the room.
According to the sound field control device of the present invention, the reverberation is output
forward and downward from the speaker 5 provided at the upper center of the room 1, so that
the sound field control apparatus according to the present invention The balance of each sound
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is improved to extend the listening range. Moreover, the output from the speaker 5 hardly affects
the rear side of the room 1 including the central portion which is the conventional listening
range. Similarly, since the direct sound and the early reflection sound are output from the
speaker 6, the listening range is extended to the rear.
[0014]
The important thing here is to consider the output from all the speakers collectively, and the
sound field is already formed by the speakers other than the speakers 5 and 6 in the part of the
listening range extended back and forth. Speakers 5 and 6 assist in extending the listening range.
[0015]
As described above, by increasing the number of speakers or outputting a plurality of types of
sounds from one speaker, it is possible to consider an infinite speaker arrangement as a sound
field control device.
However, increasing the number of speakers not only increases the cost but also causes
problems in installation space. FIG. 2 shows a speaker according to an embodiment in which
direct sound is output as well as the speaker provided at the center upper part in order to
simplify the signal processing after the speaker for initial reflection sound in the front part of the
room is one. It is a figure which shows arrangement | positioning.
[0016]
In FIG. 2, 2a is a direct sound speaker provided at the front of the room 1a, and a stereo system
is formed by two left and right speakers. 4a is a reverberation speaker provided at the rear of the
room 1a, and there are two left and right. Reference numeral 5a is also a reverberation speaker,
and is provided at the upper center of the room 1a. A speaker 6a is provided at the upper center
of the room 1a, and outputs a direct sound and an early reflection sound together. The speaker
6a may output the left side direct sound, the right side direct sound, and the initial reflected
sound by one pair of speakers, but the speaker 6a is configured by two left and right pairs of
speakers, respectively. It is preferable to output the direct sound and the early reflection sound.
Reference numeral 7a denotes a speaker provided at the front of the room 1a, which outputs the
same acoustic signal as the speaker 6a although the output intensity is different.
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[0017]
The configuration of a circuit using a DSP for generating an acoustic signal to each speaker
shown in FIG. 2 is shown in FIG. In FIG. 3, reference numeral 11a denotes an acoustic signal
source, which outputs an analog signal here. An A / D converter 12a converts an analog signal
into a digital signal. Reference numeral 13a denotes a DSP, which constitutes a digital filter as
shown in FIG. 7, and generates digital signals corresponding to the initial reflection sound and
the reverberation sound. Reference numeral 14a denotes a D / A converter, which converts the
signal generated by the DSP 13a into an analog signal to generate an initial reflection sound
signal and a reverberation sound signal. Reference numeral 15a denotes a mixer circuit, which
mixes the direct sound signal from the analog signal converted initial reflection sound and the
original sound signal source.
[0018]
The circuit configuration shown in FIG. 3 is an example, and the mixing of the direct sound and
the early reflection sound signal is performed by the analog mixer circuit 15a, but may be
performed by the DSP 13a. Although it has been described above that it is difficult to obtain a
good sound field in both the front seat and the rear seat in the sound field control device used in
a car, the present invention is applied to a sound field control device for a car Then, the above
problems can be solved. The speaker arrangement in the case where the present invention is
applied to a sound field control apparatus for a car is shown in FIG.
[0019]
In FIG. 4, reference numeral 20b denotes a car, and 1b denotes a passenger compartment. The
arrangement of the speakers is similar to that of FIG. 2, 2b is a speaker for direct sound, 4b and
5b are speakers for reverberation, and 6b and 7b are speakers for outputting a direct sound and
an initial reflected sound together. The arrangement of the speakers 2b, 4b and 7b is similar to
that conventionally used, and in the present embodiment, the speakers 5b and 6b are provided at
the center of the ceiling of the passenger compartment 1b. The speaker 5b outputs a reverberant
sound toward the lower front, and the speaker 6b outputs a direct sound and an initial reflected
sound toward the lower rear, whereby a good sound can be obtained in the front seat and the
rear seat. In the case of a car, there is no problem even if a good sound can not be obtained in the
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portion between the front seat and the rear seat, so the output adjustment of each speaker is
easier.
[0020]
According to the present invention, it is possible to extend the listening point in the sound field
control device, and in the sound field control device especially for automobiles, a good sound can
be obtained mainly at the front seat so far. However, good sound can be obtained in both the
front and rear seats.
[0021]
Brief description of the drawings
[0022]
1 is a diagram showing a basic configuration of the sound field control device of the present
invention.
[0023]
Fig. 2 shows a speaker arrangement according to an embodiment in which the initial reflection
sound output from the front of the room is output from one speaker and the direct sound is also
output from this speaker, and the output together with the speaker at the center upper part FIG.
[0024]
3 is a circuit configuration for realizing signals to the respective speakers in the speaker
configuration of FIG. 2 using a DSP.
[0025]
4 is a diagram showing a speaker arrangement when the present invention is applied to a sound
field control apparatus for a car.
[0026]
5 is an example showing the time change of the sound in the sound field, measuring the time
change of the sound from the performance point at the listening point in the concert hall or the
like.
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[0027]
6 is a diagram showing an example of the speaker arrangement in the conventional sound field
control device.
[0028]
7 is a diagram showing an example of a digital filter circuit that generates an initial reflection
sound signal and a reverberation sound signal from the direct sound signal.
[0029]
Explanation of sign
[0030]
DESCRIPTION OF SYMBOLS 1 ... room 2 ... front part direct sound speaker 3 ... front part initial
reflection speaker 4 ... rear reverberation sound speaker 5 ... center reverberation sound speaker
6 ... center direct sound initial reflection sound speaker
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