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■ Multi-system 3D sound system Referee 47-5476 ■ Japanese Patent Application No. 4345404 [Phase] Application No. 43 (1968) July 1 @ inventor Shiraishi Yuma Yokohama City 12
JVC shares in Moriyacho 3 In the same company Masami Yamazaki Dosho Doujin Doujin 煕
Applicant Japan Victor Co., Ltd. 12 12 [Facial] citation literature Special Publication 41-67
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are block schematic diagrams of each
embodiment of the present invention system, FIG. 3 is a circuit diagram of one embodiment of a
phase shift circuit used in the present invention system, FIG. 5 and 6 are respectively a phase
difference characteristic diagram and a voltage vector diagram of the phase shift circuit shown in
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-system
stereophonic sound system, in which the listener is, for example, as if it were a group by
reproducing musical tones different from the musical tones reproduced from the front from the
side or back of the listener. An object of the present invention is to provide a multi-system
stereophonic sound system in which sound can be sensed in three dimensions in a manner such
as being inside. As a conventional multi-system three-dimensional sound system, there have been
four systems in which a large number of speakers are separately arranged only in front of a
listener and these speakers are driven by different signals to clarify the front localization of the
sound source. However, this conventional method only performs the localization of the front
surface densely, and has a drawback that a sufficient three-dimensional acoustic window can not
be obtained. Also, as another conventional method, a speaker is disposed not only in front of the
person who listens but also in the back of the person 1111111, reverberation of sound
reproduced from this front speaker from the front speaker, musical instrument sound, voice and
the like from the rear speaker. There has been a method of emitting sound or delayed sound.
However, this conventional method only has the effect of giving the impression of being in a
large playing venue even in a narrow listening room by reproducing the reverberation by the
wall reflections of a large hole, and a defect that a perfect three-dimensional acoustic window can
not be obtained there were. In rare cases, for example, the sound of a moving object such as an
airplane is emitted from the rear in relation to the front, for example, it is used for depiction of a
scene giving a feeling of moving the moving object from front to back. There was nothing that
could give a perfect three-dimensional effect on reproduction. The system of the present
invention eliminates the above drawbacks and will be described below. According to the
experiments of the inventor of the present invention, in general, human beings are very well
aware of the localization of the sound radiated from the front speaker, but the sense is unclear
for the sound radiated from the rear speaker. Also, human beings are alert to the sound from the
back, especially to the stimulating impulsive sound that gives a relatively clear stereotactic sense
such as drums and cymbals from the back, annoyance, anxiety and fatigue. It turned out that it
was something to possess. It was also revealed that human being surrounded by various musical
tones from the surroundings itself has unique effects such as realism. Therefore, according to the
present invention method, first of all, musical instruments such as violins, violas, choirs,
contrapasses, etc., musical instruments such as flutes, clarinets, horns, horns and tubas,
humming, vocals such as chorus, etc. Different from a musical instrument which reproduces the
musical sound of the listener) to the listener from the front speaker and at the same time has a
content related to the musical content of the musical sound from the side or back and from the
front to the rear It is configured to reproduce the stimulating non-impulsive tone of the musical
In this case, the fact that the tone from the rear is different from the tone from the front is
determined by whether the listener feels the front or the back in the general listening [111111]
EndPage: 1 state, and the physical quantity The reason is that the sound power of musical tones
by a certain instrument is stronger in the rear than in the front. By doing this, the listener feels
the sound three-dimensionally as if in the orchestra, and a completely different good effect can
be obtained as compared to the case of listening to the musical tone from the front only. Next, in
relation to the above experiment, the sound from the rear has a large sound field generation area
as much as possible, and the sound source localization is unclear. . For this reason, it is necessary
to make the sound from the rear especially multi-channel, and to process to make the sound
source localization indeterminate. FIG. 1 shows a block diagram of an embodiment in which a
phase shift circuit is provided to perform this processing. Reference numeral 1 denotes a listener,
in front of which a speaker 5, 6.7, which emits an appropriate tone signal supplied with a
different channel from the input terminals 2, 3, 4 respectively, is arranged, and a speaker 8,
Arrange 9 An input terminal 10 is supplied with musical tone signals of musical instruments
different from the musical tone signals from the terminals 2 and 3. The signal from the terminal
10 is directly supplied to the speaker 8 through the amplifier 11. The other is phase-shifted by
the phase shift circuit 12 so as to be in-phase in the low-pitched band and opposite in the middle-
and high-pitched band as described later, and then supplied to the speaker 9 through the
amplifier 13. An embodiment of the phase shift circuit 12 has a circuit configuration as shown in
FIG. 3, and is a circuit known by, for example, Japanese Patent Publication No. 41-67. In the
figure, R is a resistor, r is a resistor of the same value. A capacitor C constitutes a bridge by these
four circuit elements, and points a and b are input terminals, and points c and d are output
terminals. If the vector of terminal voltage VB + Vr, Vr 'and vo of each element of resistor Rsryr'
and capacitor C is displayed, it becomes as shown in Fig.5, and the output voltage Vout remains
constant with the supply value. The phase shift characteristic of the output signal is in phase with
the input signal in the low range of the input signal frequency and in the range with the high
input signal frequency as shown in FIG. 4 according to the frequency of Reverse! Therefore, the
tones emitted from the rear speakers 8 and 9 are essentially different from the tones emitted
from the front speakers 5 and 1, and the sound from the speaker 9 is especially to the sound
from the speaker 8 especially in the low frequency range. The listener is accompanied by a sense
of apprehension, fatigue, etc., because the low level of the sound source can be indeterminate
without causing a volume drop in the low frequency range since the in-phase and middle-to-high
range have opposite phases [111111]. It is something that can be fascinated by a woman's threedimensional presence.
FIG. 2 shows a block diagram of another embodiment, in which 14.15 are front speakers 16, 170
musical tone signal input terminals, 18, 19, 20, 21 are rear speakers, 22 and 23 are terminals
16.6. An input terminal for supplying a tone signal different from the tone signal from 17, an
amplifier 24 for one channel of the signal from terminal 22, 25 and 26 phase shift circuits and
amplifiers for the other channel, and 27 and 28 respectively The phase shift circuit and amplifier
of one channel of the signal from the terminal 23, 29 is an amplifier of the other channel, and
provided with a pair of two channels of a channel into which the phase shift circuit is inserted
and a channel into which the phase shift circuit is not inserted. As compared with the abovedescribed embodiment, the sound field further rearward is wider, and the sound source
localization becomes indeterminate. As described above, the multi-system stereophonic sound
system according to the present invention reproduces appropriate tones including a stimulus and
a shocking front to the listener, and further includes no stimulus and a shocking front from the
listener's back or side. The tone having the content related to the music content of the front tone
is reproduced by a system different from the front tone, and the phase shift circuit is applied to
one of the channels of the reproduction system for reproducing the back or side tone. Since it is
inserted, musical tones that give a relatively clear sense of localization from the rear or side are
not reproduced, and the sound source localization of the rear or side becomes indeterminate,
which makes the listener feel uneasy. Can give the listener a sense of realism as if they were in a
band without giving a feeling of fatigue or discomfort, the listener can hear naturally rather than
stimulating, and the system of the present invention According to the backward playback level
Because it does not lose its naturalness even if it is raised by 10 dB or more, it has many features
such as being able to use many types of signal programs as the rear signal and greatly improving
the dynamic range of the rear playback sound. is there.
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