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JPS5012281

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DESCRIPTION JPS5012281
■ Multi-purpose sound field creation method ■ Japanese Patent Application No. 45-54491 @
application A 45 (1870) June 24 @ inventor Ito Akesuke Tokyo Metropolitan Government of
Japan 14 14 1 Sansui Electric Co., Ltd. 0 applicant Sansui Electric Co., Ltd. 1 [Shares] Agent
patent attorney Takehiko Suzue 3 out of 14 [Izumi 2 Izumi 2 Suginami-ku, Tokyo]
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are block diagrams showing different
embodiments of the multiple sound field creating method of the present invention, and FIG. 3
shows the arrangement of the loudspeakers in FIGS. 1 and 2. FIG.
DETAILED DESCRIPTION OF THE INVENTION The present invention phase shifts at least one of,
for example, a binary stereo signal and a difference signal of this binary stereo signal, and
radiates each signal to a common sound field by a plurality of speakers. , A multiple sound field
creation method for creating a new sound. In the so-called two-way stereo reproduction method,
right and left signals of a two-way stereo signal are respectively emitted to a common sound field
from speakers respectively disposed on the diagonal front right and left of the listener. According
to this method, it is true that the sense of direction of sound can be obtained, but this sense of
direction is for the listener's front, that is, the speaker side, and the sense of direction for the
listener's back or both sides is obtained As it can not be done, it is not satisfactory for the sound
effect of realism. Thus, the sense of reality is, for example, as shown in the example of the
performance hall, the relationship between the sound directly reaching the listener (direct sound)
and the countless reflections produced by the wall of the hall etc. It is caused by the phase
difference and direction difference between the sound and the reflected sound, and not simply by
the reverberation [111111] generated by the reflected sound. The present invention shifts the
phase of at least one of a plurality of original signals and a difference signal of these original
signals, and radiates each signal to a common sound field by a plurality of speakers, thereby
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opposing the direct sound in a performance hall or the like. It is an object of the present
invention to provide a multiple sound field creation method for creating a new sound with a
sense of reality that is superior to the conventional two-dimensional stereo reproduction method
by creating a condition similar to the interaction with a person. Hereinafter, the present invention
will be described with reference to the drawings. FIG. 1 is a block diagram showing an
embodiment according to the method of the present invention in which a binary stereo signal is
used as an original signal. In the figure, TiBeTIL is an input terminal to which the right signal of
the binary stereo signal is applied. ARI and ALl are, for example, matrix circuits for extracting the
difference signal between the outputs of the amplifiers AR and 1 if they are M and M
respectively. The phase shifters PSR2 and PSL2 have PSRI and psL.quadrature. As inputs of the
output of the amplifier ARIsALI, respectively. The phase shift characteristics of these phase
shifters can be arbitrarily changed in accordance with the installation location of a speaker
described later. AR2, AR3 and AL2 * AL3 are power amplifiers each having the output of the
phase shifter PSRI-PSR2-PSLlaPSL2 as an input, each output being a speaker SPRFs SPBR. It is
given to 5pLF and 5pLR.
Then, among these speakers, as shown in FIG. 3, for example, 5pRF and 5PLF are respectively
disposed on the diagonal front right and diagonal front right of the listener P in the room, and
5pRR and 5pLR are diagonally rear of the listener P Arranged to the right and diagonally back
left respectively. Thus, if configured as described above, when the phase shift characteristics of
the phase shifters psR1 and psL are equal, the original signals that are similarly phase shifted
from the speakers 5pRF and 5PLF, ie, binary stereo signals Right and left signals are respectively
emitted. This state is the same as that of the conventional binary stereo reproduction except that
it is similarly shifted [111111] EndPage: 1 by phase shifters psR, psLl. However, from the
speakers 5pRR and 5pLR arranged obliquely behind the listener P, the phase difference circuits
PSR2 and PSL2 respectively shift the difference signal between the original fabric signal
extracted by the matrix circuit M and the original left signal. The resulting signal is emitted. By
the way, in general, a binary stereo signal includes both the direct sound and the reflected sound
in the original sound field, the direct sound component is included in the original left and right
signal in substantially the same phase, and the reflected sound component is in the same phase.
However, most of them are considered to be contained in different phases. Therefore, the
difference signal between the original signal and the original left signal is composed of only the
reflected sound that is included in the original left and right signals with different phases, since
most of the direct sound in the original sound field is canceled or attenuated. Can be thought of
as Therefore, the phase shift characteristics of the phase shifters PSR2 and PSL2 are made
different from each other, and the phase shifters psR1 and psL1 are also made different so as to
expand the localization range of the sound image by a part of the difference signal section
reflected sound. As a matter of fact, a phase difference and a direction difference similar to the
original sound field are artificially generated between the sounds radiated from each speaker
5PRFpSPLFeSPRR, 5PLR, which causes the presence of sound to the listener P as described
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above. Will act as That is, in this embodiment, the main speakers 5pRF and 5pLF create a sound
field similar to that of the conventional binary stereo, and the auxiliary speaker 5PRR-5PLR
produces an effect of presence, and four speakers 5PRF # 5PLF. The four-dimensional sound
from SPRneSPLn can give an acoustic effect as if the listener were in a sound field like a
performance hall. Next, FIG. 2 is a block diagram showing another embodiment according to the
present invention, and the same reference numerals as in FIG. 1 denote the same parts in FIG.
That is, in this embodiment, the speaker 5pRF disposed diagonally in front of the listener P. It is
configured to be simply supplied through the amplifiers AH2 and AL2 without phase-shifting the
original signal to 5pLF. With such a configuration, the right and left signals of the binary stereo
signal are respectively radiated from the speakers 5PRF and 5PLF diagonally forward of the
listener P as in the conventional binary stereo reproduction, and the listener From the speakers
5pRR and 5pLR diagonally behind P, signals obtained by phase-shifting the difference signal
between the right signal and the left signal of the binary stereo signal are respectively radiated.
Therefore, the phase difference and the direction difference similar to the original sound field are
generated between these sounds as described above, and this acts as a sound presence for the
listener as described above. In the above description, the binary stereo signal is used as the
original signal, but the same effect can be obtained by using three or more signals as the original
signal and obtaining a difference signal from each arbitrary signal. It is obtained. Further, as is
apparent from the above description, the signals supplied to each speaker are optionally shifted
in phase by using more speakers, and the phase shift characteristics thereof are arbitrarily varied
depending on the location of the speakers, the type of reproduced sound, etc. If you do, you can
get a better sense of reality. In addition, a plurality of phase shifters with different phase shift
characteristics may be inserted in series in one signal system, and the phase may be changed at
various frequencies. As the phase shifter, in addition to one in which a resistor and a capacitor
are bridge-connected, a phase shift is used between the grid side and the plate side of the
vacuum tube, or the phase is reversed at the base side and the collector side of the transistor. It is
possible to use something that utilizes the nature. The pond water invention is not limited to the
embodiment described above and shown in the drawings, and can be implemented with various
modifications without departing from the scope of the present invention. As described above in
detail, according to the present invention, for example, a plurality of original signals such as
binary stereo signals are supplied to the main speaker, and the difference signal of any one of
these original signals is supplied to the auxiliary speaker. Since at least one signal of the signal
supplied to the speaker is phase-shifted and emitted to a common sound field, conditions similar
to the correlation between direct sound and reflected sound in a performance hall etc. can be
created, Therefore, it is possible to provide a multiple sound field creation method for creating a
new sound with a sense of reality that is superior to the conventional two-dimensional stereo
reproduction method.
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