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JPS4932322

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DESCRIPTION JPS4932322
■ Multi-purpose sound field creation method ■ Japanese Patent Application No. 45-54493
[phase] Application No. 45 <1970) June 24 0 inventor Ito Akesuke 14 14 1 Sansui Electric Co.,
Ltd. of Suginami-ku, Tokyo Tokyo ■ Applicant Sansui Denki Co., Ltd. Tokyo Ten Suginami Ward
Izumi 2 14 10 Attorneys Takeshi Suzue 3 persons outside
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are block diagrams respectively 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 In the present invention, for example, at least one
signal of a binary stereo signal and a sum signal of the binary stereo signal is phase-modulated
without shifting one signal, and each signal is shared by a plurality of speakers. The present
invention relates to a method of creating a multiple sound field in which a new sound is created
by emitting to a sound field. In the so-called binary stereo reproduction method, the left signal of
the left signal of the binary stereo signal is respectively radiated to the same sound field from the
speakers respectively disposed on the diagonal front left and right 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 It is not satisfactory for the so-called realism sound
effect. Thus, the sense of realism 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
reflected sound generated by the wall of the hall etc. It is caused by the phase difference between
the direct sound and the anti- [111111] sound, but not only by the reverberation. The present
invention shifts the phase of at least one of the plurality of original signals and the sum signal of
any of the original signals, and at least one of the phase-shifted signals or the phase-shifted
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signal. And at least one of the other signals are phase-modulated to emit respective signals to a
common sound field by a plurality of speakers, and the direct sound and this direct sound and a
certain phase difference and direction difference and direction difference with the direct sound It
is an object of the present invention to provide a multiple sound field creation method for
creating a new sound accompanied by a so-called presence by interacting the direct sound and
the reflected sound by creating a reflected sound (indirect sound). Hereinafter, the present
invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an
embodiment of the method of the present invention in which a binary stereo signal is used as an
original signal, in which TiR and TiL are input terminals to which the right and left signals of the
binary stereo signal are respectively applied. It is. AR1 and AL1 are amplifiers, respectively, and
Am is a combining circuit for extracting the sum signal of the outputs of these amplifiers AR1
and AL1. PSRl。 PSL1 is a phase shifter using the output of the amplifier ARigAL as a human
power, and PSR2 and PSL2 are phase shifters using the output of the combining circuit Am as a
human power. The phase shift characteristics of these phase shifters can be arbitrarily changed
in accordance with the installation location of a speaker described later. 08OR1 and 08CR2 are
oscillators, PMR1 is a phase modulator that phase modulates the output of the phase shifter
PSR1 with the output of the oscillator 03CR1, 2MR2 phase modulates the output of the phase
shifter PS% with the output of the oscillator 08CR2 It is a phase modulator.
03CL1 ° 08CL2 is an oscillator, PML1 is a phase modulator for phase modulating the output of
the phase shifter PSR1 with the output of the oscillator 03CL1, PML is an output of the phase
shifter PSI, 2 is an output of the oscillator 03Ct, It is a phase modulator that performs phase
modulation. Incidentally, the degree of modulation of these phase modulators can be arbitrarily
changed in accordance with the installation place of the speaker described later. AR2,A1.
Is a power amplifier in which the outputs of the [111111] EndPage: 1 phase modulators PMR
and PML are used as human power, and the respective outputs are speakers SPrF. Given to 3pLF.
Further, AR3 and AL3 are power amplifiers using the outputs of the phase modulators PMR2 and
PML as human power respectively, and the respective outputs are given to the speakers 5pRR, S
and pLR. Then, among these speakers, as shown in FIG. 3, for example, 5pRF and 3pLF are
disposed on the diagonal front right and diagonal front left of the listener P in the room, and
5pRR and 5pLR are diagonally located on the listener P Arranged to the rear right and diagonally
back left respectively. Thus, if configured as −L below, the right signal of the binary stereo
signal is phase-shifted and phase-shifted respectively by the phase shifter PSR1 and the phase
modulator PMR1 from the speaker 3pRF diagonally to the right of the listener P It is modulated
and emitted, and from the front left speaker 3pRF, the left signal of the binary stereo signal is
phase-shifted and phase-modulated and radiated by the phase shifter PSL and the phase
modulator PML, respectively. Moreover, from the speakers 3pRR and 5pLR disposed diagonally
to the rear right and left of the listener P, respectively, the f +-+ (No. 8 of the right signal of the
binary stereo signal is the phase shifters PSR2 and PSL2 and the phase modulator PMR2 Each
phase is shifted by PM− and phase modulated and emitted. Therefore, a phase difference and a
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direction difference respectively occur between the sound radiated from these four speakers, and
they interfere with each other to reach the listener P, which causes the listener P to hear as
described above. It acts as a realism of sound. Next, FIG. 2 is a block diagram showing another
embodiment of the method of the present invention. The same reference numerals as in FIG. 1
denote the same parts in FIG. That is, this embodiment simply supplies the signals to the
speakers 5pRFSPLF arranged diagonally forward of the listener P through the amplifiers AR2 and
AL2 without phase shift and without phase modulation of the original signal. It is what was
constructed. With such a configuration, right and left signals of the binary stereo signal are
respectively radiated from the speakers 3pRF and 5pLF in front of the diagonal of the listener P
as in the conventional binary sterol reproduction. Since the speakers 5pRR and 5pLR diagonally
behind the listener P emit the sum signal of the right and left signals of the phase-shifted and
phase-modulated binary stereo signal, these sounds and the speakers There is a phase difference
and a direction difference between the sound radiated from 5pRF and 5pLF, which will act as a
sound presence for the listener as described above [111111].
Of course, in the embodiment shown in FIG. 2, a phase modulator is provided in each system of
the speakers 5pRF and 3pLF, or a phase shifter or a phase modulator is removed from each
system of the speakers 5RRR and 5pLR. Also, the same effect as described above can be obtained.
In the above description, an example is shown in which a binary stereo signal is used as an
original signal, but a sum signal is obtained from each arbitrary signal with three or more signals
as original Shinmonetsu eyes. Even if these signals are phase-shifted and phase-modulated
arbitrarily, a ten-like effect can be obtained. Further, as is apparent from the above description,
more speakers are used to arbitrarily phase shift or phase modulate the signal supplied to each
speaker, and place each of the phase shift or modulation degree at the location of the speaker or
reproduce it. If it is made to be arbitrarily variable according to the kind of sound etc., better
presence can be obtained. 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 between the grid side and the plate side of the vacuum tube is
utilized, or the phase is reversed at the base side and the collector side of the transistor. You can
use the one that uses The present invention is not limited to the embodiment described in [-and
shown in the drawings, and can be variously modified and practiced within the scope of the
present invention. As described in detail above, according to the present invention, at least one of
the plurality of original signals and the sum signal of any of these original signals is phaseshifted, and at least one of the phase-shifted signals is Even if one signal or at least one signal of
the phase-shifted signal and the other signal is phase-modulated, each signal is emitted to a
common sound field by a plurality of speakers, and the direct sound and this direct sound are
present. By creating the reflected sound having the phase difference and the direction difference,
it is possible to provide a multi-field creation method for creating a new sound with a so-called
realism from the interaction between the direct sound and the reflected sound.
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