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JPS501201

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DESCRIPTION JPS501201
■ Multiple sound field creation method ■ Japanese Patent Application No. 45-61981 [Phase]
Application No. 45 (1970) July 16 @ inventor Kurata Hirotaka Tokyo 14 14 1 Sansui Electric Co.,
Ltd. Suginami-ku, Tokyo ■ Applicant Sansui Electric Co., Ltd. Tokyo 1 Suginami Ward Izumi 2 14
1 [phase] Attorney Attorney Takeshi Suzue 3 persons outside
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 5 are each a view for explaining the present
invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to create a new
sound field by radiating a binary stereo signal and a signal obtained by inverting the phase of the
stereo signal into a common space by means of a speaker. The present invention will be
described below with reference to a multiple sound field creation method. In FIG. 1, a speaker 11
emits a signal αL obtained by multiplying the left signal of the binary stereo signal by 4 and a
speaker 12 emits a signal βR obtained by multiplying the right signal R by 1. 13 is a signal that
can be represented by -γL so that the signal γL obtained by multiplying the left signal of the
stereo signal by 7 times is different in phase by 180 ° from the sound (αL) emitted from the
speaker 11 The speaker 14 emits a signal δR obtained by multiplying the right signal R by 6 so
that it is 180 ° out of phase with the sound (βR) emitted from the speaker 12, that is, it can be
represented by -δR. It is a speaker that emits a signal. Here, the speakers 11 and 12 are
disposed obliquely to the left and right of the listener 15, and the speakers 13 and 14 are
disposed obliquely to the left and right of the listener 15, respectively. Also, α, β, γ. δ is a
variable constant [111111] number that determines the volume (sound level) emitted from each
of the speakers lL12 and 13.14. If the position where the speaker 13.14 is disposed with respect
to the speaker 11.12 is the area shown by the oblique lines in FIG. 2, the object of the present
invention can be sufficiently achieved. Thus, the directions of the sound radiated from the
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speakers 11 ° 12.13.14 arranged as shown in FIG. 1 are set as shown in FIG. Consider the
localization of a so-called sound image. First, the constants .gamma. And .delta. Are smaller than
1 (.gamma..times.1, .delta..times.1), so the sounds -.gamma.L and one .delta.R emitted from the
loudspeakers 13 and 14 arranged behind the listener 15, respectively, forward The sound image
when the sound levels of the sounds αL and βR emitted from the speakers 11 and 12 are equal
(dL = βR) is sufficiently smaller than the sounds ctL and βR emitted from the arranged speakers
11 and 12, respectively. , Localize in the direction a in FIG. In the case of α) β, that is, when the
sound βR emitted from the speaker 12 is extremely smaller than the sound αL emitted from the
speaker 11 (αL) βR), the sound image of α (β The sound image of the time α, ie, when the
sound α L emitted from the speaker 11 is extremely smaller than the sound β R emitted from
the speaker 12 (a sound image of α L (β R) is localized in the direction of FIG. Next, considering
the sound image in the case where no sound is emitted from the speakers 13 and 14 and only
the sound is emitted from the speakers 11.12 at γ = δ = 0, bp: When the sounds αL and βR
radiated from the speakers 11 and 12 are equal (the sound image of αI, −1 ft> is localized in
the direction a in the figure a, α), ie, the sound βR emitted from the speaker 12 The sound
image of (αL) βR) is extremely small in the d direction when the sound ctL emitted from the
speaker 11 is α (β: in other words, the sound αL emitted from the speaker 11 is the sound βR
emitted from the speaker 12 When it is extremely small (the sound image of ctL (βR) is localized
in the e direction, respectively.
From these phenomena, the sound image moves when the speakers 13 and 14 arranged behind
the listener 15 and having [111111] EndPage: 1 make -γL and -δR respectively, and the sound
image thus spreads. It is recognized. Next, the constants .gamma. And .delta. Are greater than 1
(.gamma.-one 1.delta.-one 1), so the sounds -.gamma.L and -.delta.R radiated from the speakers
13 and 14 respectively disposed behind the listener 15 are forwardly The sound image when the
sound levels of the sounds -γL and -δR radiated from the speakers 13 and 14 are equal (γL =
δR) in the case where the sounds αL and βR radiated from the speakers 11 and 12 disposed at
the position are respectively larger The sound image is localized at the rear of the listener 15 in
FIG. 3, and the sound image at the time of .gamma.>. Delta., That is, .gamma.L) .delta.R is in the
direction of FIG. Are respectively localized in the direction of FIG. From these two phenomena,
the sound image moves in all directions around the listening position by changing the sound
level of the sound radiated from the speakers 11, 12 and 13.14, respectively, and hence the
spread of the sound field Is significantly improved. That is, the spread effect of the main field
utilizes the in-phase and anti-phase components diagonal to each other. For example, in 2channel stereo, it means that there is a correlation between L and R, that is, all of the sound
images generated from L to R1, ie, the front speakers 11 and 12 are generated. Specifically, when
L is considered as a reference, there is a component 4L having a correlation with R and L. Since
this component and one component of γ L emitted from the rear speaker 13, that is, the sound
waves emitted from the front right speaker 12 and the rear left speaker 13 reach the left ear and
the right ear, respectively, the spread is made by the binaural effect. It will happen. In the case of
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L + H, the information radiated to the sound field is completely separated from the left and right
and does not spread to the outside of the left and right speakers, but this is exactly the same as a
normal stereo. Further, as shown in FIG. 4, if the speakers 13 and 14 are disposed outside the
direction of the sound radiated from the speakers 11 and 12 and the sounds -.gamma.L and .delta.R are respectively emitted from these, this time The sound image is moved away from the
listener 15, and conversely, as shown in FIG. 5, the speakers 13 and 14 are disposed inward of
the direction of the sound radiated from the speakers 11 and 12 and one γL, The sound image
in the case of emitting a sound of .delta.R is concentrated at the position of the listener 15, and
the intelligibility of the sound image can be changed by changing the radiation directions of the
sounds -.gamma.L and -.delta.R from the speakers 13 and 14. .
As described above, according to the present invention, the left signal and the right signal of the
binary stereo signal are respectively radiated at any sound level from the pair of speakers
disposed in front of the listening position, and the pair of speakers respectively radiates Around
the listening position by respectively radiating left and right signals of the binary stereo signal
from a pair of speakers arranged behind the listening position so as to be in opposite phase to
the sound being played. It is possible to provide a new sound field creating method for creating a
new sound field having a sound spread with an acoustic effect of so-called presence, by moving
the sound image in any direction of.
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