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JPS61237600

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DESCRIPTION JPS61237600
[0001]
Industrial Field of Application The present invention makes it difficult to set the distance between
the sound source and the listening position sufficiently, for example, in the cabin of a car, so that
the distance is simulated as if the distance is sufficiently set. The present invention relates to an
acoustic device that makes it possible to obtain reproduced sound with a sense of distance. As
known in the prior art, the playback sound is the wall of the listening room. The reverberation
sound reaching the listener's ear while repeating reflections such as the ceiling and the floor has
an effect of causing a sense of distance to a sound source and a sense of expansion of a sound
field. With regard to this reverberation, in general, the reproduction object such as a record or a
tape also includes that component at the time of recording, and thus the direct sound that
directly reaches the ear from the sound source also includes the reverberation component.
However, since the reverberation component is extremely small, it can not cause the abovementioned action. Therefore, as in a small space where it is difficult to take the full distance
between the sound source and the listener, in the sound field where the sound emitted from the
sound source inevitably directly reaches the listener's ear, the above-mentioned reverberation
The action by sound can not be expected. For this reason, ambience devices that try to obtain
reverberation in a pseudo manner by reproducing a signal delayed with respect to the original
sound signal have been put to practical use (September 55, Nissan Motor Co., Ltd. issue r Nl 5
SAN Service Bulletin "No. 428, p. 269). FIG. 5 shows the structure of the ambience device, and is
displayed. A preamplifier 2 is connected to an acoustic source 1 configured by a tuner or the like.
The direct sound signal circuit 3 and the reverberation sound signal circuit 4 are branched and
provided in the preamplifier 2, and the reverberation signal generation device 5 is interposed in
the reverberation signal circuit 4. Furthermore, a mixer 6 is connected to both signal circuits 3.4,
and on the output side of the mixer 6, a main amplifier 7 and a speaker 8 are provided. In such a
configuration, an acoustic signal input from the acoustic source 1 to the reverberation generation
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device 5 via the preamplifier 2 is given a delay time to become a reverberation signal, and the
direct sound 18 of the direct sound signal circuit 3 side and the mixer 6 Mixed at Then, the
signal obtained by the mixing is amplified by the main amplifier 7 and reproduced by the speaker
B so that a reproduced sound to which reverberation is added can be obtained. Problems to be
solved by the invention However, in this ambience device, although a reproduced sound with a
reverberation is surely added by a time delay, a speaker with the same reproduced sound and a
direct sound with a reverberation. It emits from 8 and comes from the same direction.
For this reason, as described above, the actual reverberation sound with the directivity in which
the reproduced sound is reflected on the wall, ceiling, floor, etc. of the listening room to reach the
listener's ear can be approximated in terms of directivity However, it is not possible to realize an
effect that the distance to the sound source obtained only by the reverberation is felt to be
artificially far. Means for Solving the Problems The present invention has been made in view of
such conventional problems, and it comprises a direct sound speaker for reproducing an acoustic
signal output from an acoustic source, and a branch input from the acoustic source. A
reverberation circuit for applying phase change or time delay to the acoustic signal, and a
reverberation sound speaker for reproducing only the acoustic signal output from the
reverberation circuit, and for a line segment connecting the direct sound speaker and the
listening position, The angle of the line connecting the reverberation sound speaker and the
listening position is set to be not less than 00 and not more than 30 °. In the above
configuration, the acoustic signal output from the acoustic source is branched and input to the
direct sound speaker and the reverberation circuit, and the reverberation circuit is given a phase
change or time delay and is input to the reverberation speaker. Therefore, the resonant sound
reproduced by the reverberation speaker is temporally delayed, with respect to the sound
reproduced from the direct sound speaker, that is, the direct sound, like the actual reverberation
sound. At this time, since the angle of the line connecting the reverberation sound speaker and
the listening position is set to 00 or more and 30 degrees or less with respect to the line
connecting the direct sound speaker and the listening position, the reverberation sound is
Directivity with the above-mentioned angle is given to direct sound. For this reason, the
reverberation sound reaches the ear of the listener in the same way as the reflection sound
arriving on the wall, ceiling or floor of the listening room, with the angle being the reflection
angle. Then, the listener feels that the auditory sound source (hereinafter referred to as a virtual
sound source) of the reflection sound (reversible sound) from the reflection angle is located on a
virtual line forming an incident angle at the same angle as the reflection angle. Be done.
Therefore, even in a small space where it is difficult to sufficiently set the distance between the
actual direct sound speaker and the listening point, the virtual sound source can be recognized as
if the direct sound speaker is located, and the distance to the sound source can be simulated It
can make you feel so far. Embodiment An embodiment of the present invention will be described
with reference to the drawings. That is, in FIG. 1, 10 is an acoustic source composed of a tuner, a
disk player, a CD player, etc., and 11 is an amplifier. A direct sound speaker 12 is connected to
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the amplifier 11, and the direct sound speaker 12 is disposed in front of the listener M located on
the listening point P.
On the other hand, the circuit provided branched to the output side of the acoustic source 10 is
provided with a reverberation circuit 13 for giving a phase change or time delay to the inputted
acoustic signal. / 14. The reverberation sound speakers 15 are sequentially connected. A line
segment a connecting the reverberation sound speaker 15 and the listening point P is set to 30 ',
as opposed to a line connecting the direct sound speaker 12 and the listening point P. In the
present embodiment according to the above configuration, the acoustic signal output from the
acoustic source 10 is amplified by the amplifier 11 and reproduced by the direct sound speaker
12. On the other hand, the acoustic signal manually input to the reverberation circuit 13 is given
a phase change or delay time, amplified by the amplifier 14, and reproduced by the reverberation
sound speaker 15. Then, as shown by the solid line in FIG. 2, the direct sound which is the
reproduced sound of the direct sound speaker 12 is a segment, and the reverberation sound of
the reproduced sound of the reverberation sound speaker 15 is a line as shown by a dotted line.
a is emitted toward the listener M respectively. At this time, since the reverberation sound is a
sound delayed by the reverberation circuit 13 and the line segment a intersects with the line
segment at an angle of 30 ° at the listening point P, the reverberation is generated. The sound
reaches the listener M's ear with the delay time and angle. For this reason, in the ear of the
listener M, it is thought that the reverberation sound hits the virtual wall W and then arrives at
the angle, and the reflection angle α with the reverberation wall W from this illusion is And the
virtual line C having the incident angle β equal to the reflection angle σ, it is felt as if the sound
source of the original sound that generated this reverberation, that is, the virtual sound source
12X. For this reason, although the direct sound speaker 12 is actually positioned 11 ahead of the
listener M, it is felt by the above-mentioned illusion to be positioned on the imaginary sound
source 12X, and the distance to the sound source 12, ie the direct sound speaker 12 11 can be
artificially set to 42. In this embodiment, although an angle t-30 'of the line segment a with
respect to the angle of t-30' is shown, if it is an angle close to 00 as shown in FIG. , X2 is far from
the listening point, the distance to the pseudo sound source pm gold length (can be. However, on
the contrary, at an angle exceeding 3001-, it becomes difficult to illusion that the reverberation
sound coming from too much anisotropy to the direct sound is the reflection sound of the direct
sound, and as a result, the virtual wall W And the virtual sound source can be audiblely
perceived, and in order to reliably obtain the virtual wall W and the virtual sound source, it is
essential that the angle be 0 ° or more and 30 ° or less. It becomes clear by the experiment of.
FIG. 4 shows another embodiment of the present invention, which is applied to a stereo
reproduction apparatus. That is, the sound source 10 is a direct sound speaker 12L via the
amplifier 11 in the R (left, right) channel. 12R is connected, while a mixer 16 is interposed
between the acoustic source 10 and the reverberation circuit 13. A reverberation sound speaker
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15 is connected to the reverberation circuit 13 via an amplifier 14, and the reverberation sound
speaker 15 is provided at the center of the direct sound speakers 12L, 12) L. A line segment a
connecting the reverberation sound speaker 15 and the listening point P is a line connecting
both the direct sound speakers 12L and 12R and the listening point P, and is set at an angle of
00 to 30 'with respect to b. In the present embodiment according to the above configuration, the
reverberation sound speaker 15 reproduces the acoustic signals of the L and R channels. For this
reason, the L channel side direct sound speaker 12L uses the L channel component reproduction
sound of the reverberation speaker 15, and the R channel side direct sound speaker 12R uses the
R channel component reproduction sound of the reverberation speaker 15. A virtual sound
source can be obtained in the same manner as in each of the above embodiments, so that not
only the monaural reproduction apparatus as in the first embodiment but also the stereo
reproduction apparatus can virtually feel the distance to the sound source far . In the present
embodiment, a single reverberation sound speaker 15 is used, but each direct sound speaker
12L. It is a matter of course that the imaginary sound source can be made clearer by arranging a
reverberation sound speaker corresponding to 12R. As described in detail in the invention, the
present invention provides a direct sound speaker that emits direct sound and a reverberation
sound speaker that emits reverberation, and for a line segment connecting the direct sound
speaker and the listening position, It is set as the structure set to angle 受 00 or more and 30 'or
less of the line segment which connects a reverberation sound speaker and a listening position.
Therefore, the reverberation sound reaches the listener on the listening point as if reflecting the
angle at the same angle as the reflection sound that actually arrived at the wall, ceiling, and floor
of the listening room, and the imaginary sound source It is felt to be located on a virtual line that
forms an incident angle that is the same as the reflection angle. Therefore, even in a small space
such as a single room where it is difficult to sufficiently set the distance between each actual
speaker and the listening point, the virtual sound source is illusive as if it is the arrangement
position of the direct sound speaker, and the distance to the sound source A sound field with a
sense of distance can be obtained that senses the distance in a pseudo manner.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 and 3 are
diagrams showing the operation of the embodiment, and FIG. 4 is a block diagram showing
another embodiment of the present invention. FIG. 5 is a block diagram showing an ambience
device.
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10: sound source, 12, 12L, 12R: direct sound speaker, 13: reverberation circuit, 15: reverberation
speaker, P: listening point, M: listener. Outside 2 persons Figure 2 Figure 5
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