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JPS61237599

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DESCRIPTION JPS61237599
[0001]
Industrial Applicability The present invention makes it possible to obtain a sound field with a
sense of expansion by separately reproducing direct sound and reverberation, and at the same
time allows variable localization of the sound image according to the listener's desire. The
present invention relates to a sound field control device that enables control. Conventionally, in
order to obtain a sound field having a sense of expansion, an ambience device has been put to
practical use that reproduces an original signal by adding a reverberant signal composed of
reverse phase components and time delay components of left and right channel signals. However,
this apparatus has the disadvantage that the opposite phase sounds cancel each other when the
two signals are added, and the reproduced sound is different from the original sound. The
acoustic device which eliminated the said fault by reproducing | regenerating the signal
separately was proposed (Japanese Patent Application No. 60-50944). As shown in FIGS. 3 and 4,
this acoustic device comprises an acoustic source 1 composed of a deck, a tuner, a CD player and
the like. A preamplifier 2 is provided, and power amplifiers 3 and 4.5 are connected to the left
and right (L, R) channels of the preamplifier 2. The power amplifiers 3 and 4 are provided with
side speakers 7 fR1 and 3 (R1 is connected to the both sides of the instrument panel 6, and both
side speech cuffs m) and 8 (R Center speaker 9 (L) is disposed at the center of. -Another circuit
having a mixer 10 is connected to the amplifier amplifier 2. The reverberation circuit 11 adds a
predetermined delay time to the sum signal L + R of R channel signals mixed or mixed with the
mixer 10, 12 are connected. Power amplifiers 13 and 14 are connected to the reverberation
circuits ti and 12, respectively, and the power amplifiers 13 and 14 have the center. Side
speakers 7 (R1, 8 (! 'I), 9 (The reverberation speakers 15, 16 arranged between Ij are connected.
In such a device, the center and side speakers 7 (R1.degree. 8 (R1, 9 (from Ij, direct sound
reproduced faithfully from the acoustic signal output from the acoustic source 1), reverberation
sound speakers 15, 16 from Reverberation sounds having a time delay with respect to the direct
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sound are simultaneously emitted separately. For this reason, the direct sound and the
reverberation sound should not cancel each other (in the case of the passenger M, the side
speaker 7 (R1 and the center speaker 9 in the center of the mountain and the passenger M1 and
the center speaker 9 (LJ and Side speaker 8 (A clear sound image localization can be obtained at
the center of R1, and a predetermined sound field with a sense of expansion can be obtained by
reverberation sound with a phase difference or time difference separately emitted from direct
sound It is.
Problems to be Solved by the Invention However, in the above-mentioned acoustic device, a
sound field having a sense of expansion is obtained from the reverberation acoustics reproduced
from the reverberation sound speakers 15 and 16 separately provided in this manner, and
reproduction is performed. For example, when listening to an announcement program, it may be
an unclear sound due to the reverberation added to each direct language, while it may be an
optimal sound field depending on the target music or the listener's preference. The disadvantage
is Moreover, when the listener listens to vocal music, the position where the singer stands and
the positional relationship with the playing instrument of the back wants to obtain clear sound
image localization that can be easily imagined, or conversely light music ( Even if you want to get
a sound field that has a sense of enveloped reverberation to listen to the background music (B, G,
M) as the background music (B, G, M), you can get the constant sound field mentioned above It is
not possible to select the sound field according to the listener's preference or the music to be
reproduced. SUMMARY OF THE INVENTION The present invention has been made in view of
such conventional circumstances, and it is intended that each channel individually reproduces
the audio signal of each channel output from the audio source, directly for each channel. A
sound-writing device, a reverberation circuit in which phase change or time delay is added to the
acoustic signal of each channel branched and input from the acoustic source, and reverberation
signal of each channel output from the reverberation circuit are reproduced. An indirect sound
reproducing device disposed in proximity to the direct sound reproducing device; and a
reverberation signal of each channel output from the reverberation circuit alternatively input
according to selection to the reverberation sound reproducing device Means are provided. In the
above configuration, the acoustic signal of each channel output from the acoustic source is
branched and input to the direct sound reproduction device and the reverberation circuit. Then,
after a predetermined phase change or time delay is given by the reverberation circuit to become
a reverberation signal, the reverberation signal is input to a reverberation reproduction device
closely arranged corresponding to each direct sound reproduction device. At this time, the
channel of the remaining 41 signal input to the reverberation sound reproduction apparatus is
switched by the selection means according to the listener's intention. Therefore, when the
selection device is operated so that the direct sound reproduction device of each channel and
each reverberation reproduction device brought close together correspond to the same channel,
the direct sound and reverberation sound of the same channel having the same waveform
although having a time difference Since sound is reproduced from the same direction,
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reverberation is added without affecting the sound image formed by the direct sound, and a
sound field having clear sound image localization can be obtained.
Also, when the front AC selection device is operated so that each reverberation sound
reproduction device closely arranged corresponding to the direct sound reproduction device of
each channel becomes a different channel, the direct sound and the reverberation sound of
different channels having different waveforms are generated. Since the sound is reproduced from
four directions, the sound image formed by the direct sound is affected by the different channel
reverberations of different waveforms emitted from its vicinity, and the sound image is unclear
(hereinafter referred to as soft focus). And the direct sound and the indirect sound of the same
channel come to the listener's ear from different directions, resulting in a more spacious sound
field. Therefore, by operating the selection means, a sound field in which the sound image is
clearly localized and a sound field in which the sound image is soft-focused are obtained, and the
sound according to the listener's preference, listening conditions, reproduction object, etc. A
place is obtained. Embodiment An embodiment of the present invention will be described with
reference to the drawings. That is, in FIGS. 1 and 2, 1 is an acoustic north composed of a decker,
a tuner, a C'D player, etc., 2 is a preamplifier, and the R channel of the preamplifier 2 is a power
channel 7'3,4. Further, the power amplifier 5 is connected to the-channel. The power amplifiers 3
and 4 are connected to the side speakers 7 (R1 and 8 (R1 are connected as direct sound
producing devices for L channel, and the side speakers 7 (3) and 8 (R1 is a compartment of the
automobile 17) It is arrange | positioned by the both sides of the instrument panel 6 which forms
a front wall. Further, a center speaker 9 (a speaker is connected to the power amplifier 5, and the
center speaker 9 (an IJ is disposed on the instrument panel 6 between the side speakers 7 (R 1
and 8 (approximately R 1 There is. Further, channel selection switches 18 serving as selection
means are provided for each channel of the preamplifier 2 and the R channels. The channel
changeover switch 18 is provided with movable contacts 18a, 18b, 18a having fixed contacts in
the L and R channels, respectively. The movable contacts 18a, 18b, 18c are voluminous 19, 20.
21. Reverberation circuits 22, 23, 24 for applying phase change or time delay to the acoustic
signal of each channel, and power amplifiers 25, 26, 27 for amplifying reverberation signals
outputted from the reverberation circuits 22, 23, 24. It is connected sequentially. The power
amplifiers 25, 26, 2? Play the reverberation sound! ! The reverberation speakers 28, 29, 30 are
connected and the II! The 441I speakers 28, 29, 30 are disposed at the center, side speakers 7
(R1, 8 (R1, 9 (in proximity to L1, the upper surface 6a4C of the instrument panel 6 is disposed).
Note that (Ll, (R) beam added to each speaker code in the figure. R indicates a channel, and (L, R)
indicates a channel to be selected. In the present embodiment according to the above
configuration, the center. Each of the side speakers 7 (R1, 8 (River, 9 (from L1 a direct sound is
emitted which faithfully reproduces the acoustic signal of each channel outputted from the
acoustic north 1). Therefore, in the case of the passenger M who is the listener, the side speaker
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7 (R channel sound of R 1 and the center speaker 9 (the L channel sound of the season, and in
the passenger M, the center speaker 9 (L) Left and right balanced stereo soundling sound is
obtained respectively by L channel sound and side speaker 8 (R channel sound of R1, and the
center and side speakers 7 fR1, 8 (R1, 9 (direct sound from L1 The sound image is localized in
front of the occupants M, M, M, respectively. And when crew members M, M, listen to the
announcement program, or when a sound image is desired where the positional relationship
between the singer's position and the back playing music peach can be easily imaged, the vocal
image can be imagined As shown in FIG. 1, the movable contacts 13 a and 18 b + 18 C are
displaced. Then the reverb speaker 28, 29. From each of the adjacent speakers 30 and 30, the
adjacent speakers 7 (R1, 8 (R1, 9 (the reverberation sound of the same channel as L1 is
reproduced) Therefore, since the direct sound and the reverberation sound arrive at the ear of
the occupant Mle Nh from the same direction, it is possible to obtain a natural sound with little
reverberation. Also, since the direct sound and the reverberation sound of the same channel
radiated in this way have the same waveform with some time difference, the reverberation sound
is added without affecting the sound image formed by the direct sound, and hence It is possible
to obtain a sound field with a clear localization with which the above-mentioned singer's position
etc. can be easily imaged. Next, when it is desired that the passenger M1 Mt listens to listen to
light music (Chie Easy listening) as background music (B, G, M), the movable contacts 18a, +81).
Invert 18 c. Then the reverb speaker 28, 29. From 30 each adjacent speaker, 7 ml, 8 (R1, 9 (r, l)
reverberation sound of a different channel is reproduced. Therefore, since the direct sound and
the reverberation sound of different channels which are different waveforms are reproduced
from the same direction, the sound image formed by the direct sound is influenced by the
different channel reverberation sounds of different waveforms radiated in close proximity. The
sound image is soft-focused.
Also, the direct sound of the channel and the reverberation sound of the channel are multiplied
from different directions jLM,. Since the sound comes to the ear of M, this reverberation sound is
reflected as if the direct sound of each channel is reflected on the wall that forms a wide space,
and it is illusion that there is a sense of more expanse, the aforementioned squared * Ut-cho The
desired sound field is obtained. Thus, by operating the channel switching switch 18 in this
manner, a sound field in which the sound image is clearly localized and a sound field in which the
sound image is soft-focused are obtained, and the passenger M11 M who is the listener! The
sound field can be obtained according to the preference of the user, the listening conditions, the
reproduction target, and the like. In the above embodiment, it is mounted on the automatic 'Ip17, and the center and side valley speakers 7 (R1, 8 (River, 9 (applicable to a device capable of
obtaining a sense of stereo for each occupant M,, M by Ll) However, the same action and effect
can be obtained even when applied to ordinary stereo reproduction aIIL, and in particular,
listening in a narrow room using a bookshelf-type speaker is scheduled. When applied to a
playback apparatus, it is possible to freely obtain 壱 with clearly localized sound images and a
sound field with a sense of spread where soft images are localized with soft focus regardless of
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the volume of the room. is there. As described in detail in the invention, the present invention
closely arranges a direct sound reproducing device for emitting direct sound of each channel and
a reverberation sound reproducing device for emitting reverberation sound of each channel, and
the reverberation sound reproducing device The channel of the reverberation sound emitted by
can be switched by the selection means. Therefore, when the direct sound reproduction device
and the reverberation sound reproduction device disposed in proximity to the direct sound
reproduction device are made to be the same channel by the selection means, the direct sound
and the reverberation sound of the same channel are reproduced from the same direction. The
reverberation is added without affecting the sound image formed by the direct sound, and clear
sound image localization is obtained. Also, if the two reproduction devices are different channels,
the direct sound and the reverberation sound of different channels are radiated from the same
direction, thereby making the sound image soft-focused and the reverberation sound of each
channel coming from different directions. It is possible to obtain a more spacious sound field.
Therefore, according to the preference of the listener, the listening conditions such as the size of
the listening room, the program being symmetrical to be reproduced, the sound field in which
one sound is clearly localized and the spread in which the sound image is soft focus It is a thing
that can be freely obtained with the sound field with a sense.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a side view
showing a speaker arrangement of the embodiment, and FIG. 3 is a block diagram of an acoustic
device according to the prior application. FIG. 4 is an explanatory view showing a speaker
arrangement of the same clothes.
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