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JPS5028241

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DESCRIPTION JPS5028241
? Three-dimensional reproduction method ? Japanese Patent Application No. 46-211920
Application No. 46 (1971) Published April 6 47-37603 @ Akira 47 (1972) December 1 [phase]
Inventor Takahashi Ryo Tokyo Suginami Ward Izumi 2 14 applicants Sansui Electric Co., Ltd. 0
applicants Sansui Electric Co., Ltd. Tokyo 14 Tokyo Tenami Izumi 2 14 10 agents Patent attorney
Takehiko Suzue 3 persons outside the invention Detailed Description of the Invention The
present invention is transmitted in the 4 channel transmission system The present invention
relates to a three-dimensional reproduction method for receiving three-dimensional signals and
reproducing three-dimensional sound. Although a stereophonic sound signal collected by a
plurality of microphones in a certain sound field should be transmitted individually by a plurality
of transmission systems, the number of transmission systems increases when the number of
microphones increases. C. It is not practical to transmit the sound signal from the microphone
individually because it is not practical, and since the sounds collected from the individual micro
hoes are quite independent and have a correlation with each other, they are the same as the
number of microphones It is rather uneconomical to use a transmission system of Therefore, the
following method is considered as a method of converting a three-dimensional sound signal in an
original sound field collected by a plurality of microphones into four signals and transmitting it
by a four-channel transmission system. That is, as shown in FIG. 1, a plurality of microphones DI,
D2... Dn are sequentially arranged around the center 0 in a certain sound field S, and the
inclinations in the vertical direction are made different appropriately. The configuration is to
collect sound effectively. Incidentally, the microphones D1 to Dn may be disposed so as to be
appropriately inclined in the radial direction at the central portion as shown in FIG. Then, as
shown in FIG. 3, the output ends of the microphones D1 to Dn are connected to the input side of
the encoder 1, and the acoustic signals collected by the microphones D1 to Dn are converted into
four channel signals A, B, O, D. Convert. In this case, as shown in FIG. 4, in the sound field S, the
angle of the left turn with respect to the front direction Y on the horizontal plane with the front
direction Y and horizontal direction X as axes is 01. ?2. The vertical angle in the threedimensional space is defined as ?2. ? 2 ? ... ? ? ... ? n, and the output voltage Es of the
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microphones D1 to Dn Es, E2, ... 'Ea' ... En, A "" Et + Bz + ... + B? ten ... + En B = Et cos 9) t Sj ? ?
O 1 + B 2 ccsq) 2 sin ? 2 +... + BCO 8 ? sin ? +... + B n c O 8 ? H 8 j n ? n O = Et CO 89) 1 C
08 O t 10 E 2008% CO 5 ? 2+.
+ и и и Ea ? ? ? ? ? ? 10 и и и и Encos ? ? fight D = BISin 9) l + E2S "9) 2 +" 10 E ? sjn 9) a +
"7 + En Sin ?. The signals are converted into four channel signals A, B, O, D. Therefore, the signal
A is the total sum of the acoustic signal voltages collected by the microphones D1 to Dn, the
signal B is the lateral direction (X direction) component 5 of these acoustic signal voltages, and
the signal C is the longitudinal direction of the acoustic signal voltage (Y Signal) and the signal is
the vertical direction (Z direction) component of the acoustic signal voltage. ?????????
??????????????????? Is added. Fa = A + BCos?aSin?? + OcOs (PaF?ct ?
DSin?f'a ?? (Es + B2 +... 10E? +. ? CO 3 ?, + E 2 cascp 2 cos ? 2 CO 39) (ECO 3 ? ? 10 иии
+ E ? CO 32 ? ? cos 2 ? ? 10 и и и 10 En cos ? n c O s ?, CO 89) ? CO 5 ? a) + (E 1 ? ? 9
? t ? 1 n 9) a 10 s E 2 S! n ? 2 sin ?, +,-и + E & 81 n 2 ?, 10-+ En S In 9) n 5 in 9) ?) = El (1 +
cascp 1 coscp cos (? 1-? ?) 1-1 sin ? IS in ? ?) + ... + 2 E ? + ... + En! t1 + CO39) nCO3
(pacos (?). ?? ?) -4-sin ? n 5 in 9) ?) That is, while the output signal in the target direction
is doubled, 1 + coscp for the signal collected in the horizontal direction ?1 and the vertical
direction ?1. , Cos ? a cos (? 1-?a) ? sin ?, sin ? 0. Because of this, the directional
characteristic is one! It becomes-(1 + cos ?, cos ? acos (? 1 -?, 1) + sin ? 1 sin ? ?).
Considering a horizontal plane where ? = 0 on both the sound collection side and the
reproduction side, the directional characteristic becomes Y (l + cos (? и -??)) as shown in FIG. It
becomes a cardioid directional characteristic. If the horizontal direction is matched with ?1 = ?
and attention is focused only on the vertical direction, the directivity characteristic becomes a
cardioid characteristic. As described above, the transmission directivity characteristics including
the encoder and the decoder become cardioid characteristics in the horizontal plane and the
vertical plane, and the acoustic signals are almost the same as when the acoustic signals collected
by the microphone are individually transmitted and added to the speaker It can be transmitted to
reproduce stereophonic sound.
As described above, the decoder 122 is configured to transmit signals A, B, O, D of four channels
from the transmission system as Fs = ABBcos (P1 sin ?1 ? Ccos?ICO5?t ? D ? ? ? ?
?1F2 = A + BcOs9?2???2 + C cos?2 cos?2 + D? ? 9) 2F = A О B? Debate sin ?. Ten C
? I% ringing ?. +]) Sin ?. The signals F1 to n are converted as shown in FIG. 7, for example.
That is, the input terminals of the plurality of [111111] amplifiers 131 to 13 n are connected to
the transmission system a, the input terminals of the in-phase amplifier 141 and the reverse
phase amplifier 142 are connected to the transmission system, and the in-phase amplifier 143
and the transmission system C are connected. The input terminal of the anti-phase amplifier 144
is connected, and the transmission system d is connected to the input terminals of the in-phase
amplifier 145 and the anti-phase amplifier 146. Between the output terminal of the in-phase
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amplifier 141 and the output terminal of the anti-phase amplifier 142, a plurality of cosine wave
generating variable resistors 151 to 15n having the same configuration as the cosine wave
generating variable resistors 51 to 5n described above are connected in parallel. And their
respective sliders are connected to the input terminals of the in-phase amplifiers 161 to 16 n and
the anti-phase amplifiers 171 to 17 n, respectively. Between the output terminals of the in-phase
amplifiers 161 to 16 n and the anti-phase amplifiers 171 to 17 n, both ends of the sine wave
generating variable resistors 181 to 18 n having the same configuration as the sine wave
generating variable resistors 101 to 10 n described above are connected The slider is connected
to the input side of the amplifiers 131 to 13 n. Between the output terminals of the in-phase
amplifier 143 and the reverse-phase amplifier 144, cosine wave generating variable resistors
191 to 19n having the same configuration as the cosine generating variable resistors 151 to 15n
are connected in parallel, and their sliders are respectively in phase It is connected to the input
terminals of the amplifiers 201 to 20 n and the antiphase amplifiers 211 to 21 n. Between the
output terminals of the in-phase amplifiers 201 to 20 n and the anti-phase amplifiers 211 to 21
n, variable resistors 221 to 22 n for cosine wave generation having the same configuration as the
variable resistors 111 to 11 n for cosine wave generation are connected, respectively, Are
connected to the input sides of the amplifiers 131 to 13 n. Further, between the output terminals
of the in-phase amplifier 145 and the anti-phase amplifier 146, variable resistors 231 to 23n for
sine wave generation are connected, and their sliders are connected to the input sides of the
amplifiers 131 to 13n. Same, variable resistances 151 to 15 n, 191 to 19 n. The slider positions
231 to 23 n have an angle ? 1 in the Z-axis direction from the horizontal surface of the speakers
241 to 24 n disposed in the recycled hot water 24. The slider positions of the variable resistors
181 to 18 n and 221 to 22 n are set corresponding to the angle ?1 of the speakers 241 to 24 n
in the horizontal plane. Set according to ?2... ?n.
??? Then, the signal A from the transmission line a is the amplifier 131. In addition to 13n,
the signal B is applied to the in-phase amplifier 141 and the reverse-phase amplifier 142 for
amplification, and is applied to the variable resistors 151 to 15n to obtain signals of BCO3?, ~
BCO8?n from the slider. This signal Bcoscp1-Bcoscpn is amplified by the in-phase amplifier 161
to [111111] EndPage: 3 Warning: Page discontinuity 2 pages missing 16n and the reverse phase
amplifier 171 to 17n, added to the variable resistors 181 to 18n, and from the slider thereof A
signal Bcoscp, sin?1, BCO59) 2Sln?2- и 13cos?n5in?n is obtained and applied to the
amplifiers 131 to 13n. Also, the signal C from the transmission line C is amplified by the in-phase
amplifier 143 and the reverse-phase amplifier 144 and added to the variable resistors 191 to
19n to obtain a signal of CcOs?1 to Qcos?n from the slider. The signals 0CO5?1 to Qcos?n
are amplified by the in-phase amplifiers 201 to 20n and the reverse phase amplifiers 211 to 21n,
respectively, applied to the variable resistors 221 to 22n, and from the sliders, signals of 0CO89)
1CO8?1, Ccos?2cas022 ... Ccos?ncos?n are obtained Add to ~ 13n. Also, the signal from the
transmission line d is amplified by the in-phase amplifier 145 and the reverse-phase amplifier
146 and applied to the variable resistors 231 to 23n to obtain a signal of DSin?1!] Sin?n from
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the slider, and is applied to the amplifiers 131 to 13n. Be The amplifiers 131 to 13 n combine
and amplify these input signals to obtain signals F1 to Fn. The signals F,..., Fn are respectively
applied to the speakers 241 to 24n disposed in the reproduction bath 24, and the threedimensional sound is reproduced from the above-mentioned. In the above description, the
direction of the microphone at the time of recording and the direction of the speaker at the time
of reproduction are the same. Actually, the direction of the speaker can be arbitrarily selected,
and the number of microphones and the number of speakers can be selected. It may be different.
Also, the output level of the decoder can take any level as needed, not limited to the level
indicated by the above equation. Also, the direction of the speaker may be based on a direction
deviated from the sound field and the reproduction hot water without using the front and back
direction, the left and right direction, and the up and down direction as reference. As described in
detail above, according to the present invention, the four channels of signals A, B, 0,. By receiving
D, it is possible to provide an extremely effective stereoscopic reproduction method that can
obtain almost the same sound field effect as when using as many transmission systems as
microphones.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are plan views showing an example of
microphone arrangement at the time of sound collection according to the present invention, and
FIG. 3 is a system diagram including a transmission side for explaining an embodiment of the
present invention. 4 is a diagram for explaining the transmission method used in the
embodiment, FIG. 5 is a circuit diagram showing the transmission method used to obtain a signal
to be received in the embodiment, and FIG. The figure for demonstrating the transmission
characteristic by an Example, FIG. 7 is a circuit diagram which shows the Example. ad:
transmission system 122: decoder 241 to 24 n: speaker. ???????????????? ?
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