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JPS50105101

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DESCRIPTION JPS50105101
3 January 28, 1984 2 Inventor 3 Patent applicant zip code 4sO # -4 agent zip code 110 phone
(834) 3621 (for) ~ 6 [phase] Japan Patent Office ■ JPA 50- 1.051. 010 published Nissho 50.
(1975) 8.19. q-11620 In-hospital number: 734623, specification 1 title, invention of stereo
reproduction method When playing original sound in a field smaller than the original sound field,
direct sound and whistling direct sound in the field are constant The first reflection 1 sound
giving the size of the auditory space formed by delaying time, and the second reflection sound
delaying the first reflection further for a fixed time to give an expanse of the former type A
stereophonic reproduction system characterized in that sound field reproducibility is obtained by
controlling the delayed sounds of the first and second reflected sounds and the blue dragon level
with respect to the direct sound.
2 Claims
The present invention relates to a stereo reproduction system, and more specifically to a 2ch,
Aeh system stereo reproduction, an acoustic effect similar to a large room even in a small room,
and a hearing-like system Ambienee K relates to a stereo reproduction system adapted to obtain
similar effects. In order to obtain the sound field reproducibility, it is desirable that the sound of
the original sound field is reproduced at a place up to the actual t, and further that it is
reproduced with the same size as the original sound. However, in stereo reproduction, in general,
the acoustic requirements largely differ depending on the size of the reproduction site as shown
by the echo time pattern in FIG. FIG. 1 (sQ represents an echo time pattern in a relatively large
room which does not reach the original sound field, but in this case, the initial reflection sound 2
appears 621 seconds after the emission of the direct sound 1). Figure (6) shows the echo time
pattern in a relatively small room, in this case the early reflections 2 appear 518 seconds after
the emission of the direct sound 1. According to the experiments of the inventors, the sound
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quality of the direct sound is degraded when the next time (echo time) Δt becomes 15 m5 ec or
less as described above. In addition, the early reflections should be more sensitive to the sense of
hearing from the side, and should be the reflection from the side of the Lord, which gives the
sound an audible sense. Furthermore, in large rooms, the room has a low reflected sound density,
and in small rooms, EndPage: 1 is high. % K, the distance Δt between the direct sound and the
subsequent reflected sound has a large influence on the size of the auditory space. Therefore, in a
music hall or the like, a pattern is recommended in which the interval Δt is sufficiently large in a
range (5 rnsec or less) where echo does not occur, and in which no reflected sound is present
due to direct sound and early reflection. This invention is intended to produce the same effect as
a sound field (for example, a hall) even in a small room in consideration of the above-mentioned
problems of poor reproduction of the original sound in a small room, and the feature is that the
small room To the direct sound produced in a small (15 m 5 ec or less) time interval, the
following reflected sound is removed by putting a sound absorbing material on the wall ring
which takes part in the reflection etc. It provides a stereo reproduction system that is artificially
produced and that can produce the same sound effects as those in a large room even in a small
room. Hereinafter, the present invention will be described in detail by way of examples. FIG. 2 is
a block diagram of a standard speaker system implementing the stereo reproduction system of
the present invention.
In addition, this configuration loses the Rga output of the stereo signal from the stereo
demodulation circuit etc. of the stereo receiver (not shown). R111 input ladder RIN and L pieces
of L side output incorporating L side output, amplifier AMP1 . Speakers SPR and spL for direct
sound emission are disposed on the front side (front side) of the service area SA of the listening
room RR via the AMP, and a delay circuit island with a maximum delay time of τR from the R @
input terminal RIN , Speaker SP □ emitting the reflected sound of Igl to the side (right side) of
the listening room RRo service area 5AQR via the resistor R □ for coupling, the variable resistor
VR1 for volume control and the amplifier AMP, the Lll input Terminal LIN # #) Resistor R3 for
delay circuit DLp coupling with maximum delay time .tau. L. Variable resistor VR for volume
control and amplifier AMP. The speakers SP, which emit the second reflected sound, are
respectively disposed on the L side (left 11) of the service area SA of the listening room RR.
Furthermore, the second reflected sound emission mainly composed of the R adjustment signal
and the L adjustment signal from the output end of the delay circuit DR via the delay circuit
including the τ wing 'and the resistor R8 for coupling The L adjustment signal and the R
adjustment signal are input to the input side of the variable resistor VR of the system, and the
delay circuit DL / with the maximum delay time from the output end of the delay circuit DL via
the delay circuit DL / and the resistor R4 for coupling. A circuit is provided which is coupled to
the input side of the variable resistor VR1 of the first reflection sound emission system mainly
composed of In addition, the delay circuit, and each output terminal of DL, a resistor R, R for
coupling, a variable resistor VR for volume control. And an amplifier AMP, a speaker SP island for
emitting a third reflected sound from above the front surface of the service area SA of the
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listening room RR. FIG. 2 is a block diagram of an ideal speaker system according to the present
invention. That is, as in the case of FIG. 1, this configuration takes in R-side output from the
stereo demodulation circuit etc. of the stereo receiver (not shown) and L-in input terminal RIN to
take in L-side output and L-side output. 1. Each amplifier AMP1. The speakers spR and spL for
direct sound emission are disposed on the front side (front side) of the service area SA of the
listening room via AMP, and the maximum delay time from the R input terminals RIN is a delay
circuit of the τ wing The speaker SP1 that emits the first reflected sound on the R side (right
side) K first side of the service area SA of the listening room 可 変 through the variable resistor
VR1 for adjusting the volume of DRy and the amplifier AMP. Loudspeaker SP snow that emits the
second reflected sound is disposed on the service area 5AOL side (left @) of the listening room
m1 through the maximum delay time τL-delay circuit DL and the amplifier AMP.
Furthermore, from the output end of the tuning circuit island, the variable delay VR for adjusting
the volume of the delay circuit DR'r and the amplifier AMP with the maximum delay time of
.tau.R ' To 4.1). '3' '' emitting a reflected sound-power 8 P · · · L 'delay single circuit DL', variable
resistor VR for volume control, and L 'at the maximum delay time of the output of the delay 1
circuit DL End page of the listening room 鳳 through the two-width amplifier AMP, and the
speaker SP that emits the fifth reflected sound R 儒 (right side) K of the two area SA is disposed.
The front of the service area SA of the listening room through the mater, the delay circuit DR,
each output end of the DL, the resistor R for connection and the resistor R for foreground
adjustment, and the amplifier AMP. A speaker SP that emits a third radiation sound from above is
set. FIG. S is a block diagram of a speaker system of a simple configuration according to the
present invention. That is, as in the case of FIG. 1, this configuration takes in the R 儒 output such
as the stereo demodulation circuit of the stereo receiver (not shown) and the L input terminal
RIN taking in the L side output. Each amplifier AMP1. Speakers SPx and SPL for direct sound
emission are disposed on the front side (front side) of the service area SA of the listening route
mlα via the AMP, and a delay circuit with a maximum delay time of τR with the R side input
terminal RIN. A speaker SP □ that emits a first reflected sound to the service area 5AQR side
(right side) of the listening room RR via a horse, a resistor R1 for coupling and an amplifier
AMPs, and the above-mentioned input terminal Delay circuit DL with maximum delay time fL
than LIN. Listening room dual service area SA Ll through resistor R3 and amplifier AMP, for
coupling! (Left side) A speaker SP 冨 that emits the K second reflected sound is disposed. K, a
circuit coupled to the input side of the amplifier A of the second reflected sound emission system
A via the phase shift circuit SS1 of the delay circuit and the resistor @R for coupling via the phase
shift circuit SS1, and A circuit is provided which is coupled to the input of the amplifier AMP of
the first reflected sound emission system via the output of the delay circuit DL and the resistor R
for coupling and the phase shift circuit SS. In addition, the fifth radiation from above the front of
the service area SA of the listening room via the coupling resistors R, R and the amplifier AMP
from the output side of the two phase shift circuits ss, ss described above Install a speaker SP
that emits a sound.
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In each of the above configurations, the delay circuits DL and DR use circuits capable of delaying
analog and digital signals, and in the circuits, the size of the aural space is perceived. Control the
spread (size, width). In addition, in the configurations of FIGS. 1 and 2, a phase shift circuit as
shown in FIG. 3 may be appropriately inserted on the input side of the variable resistor VR. Next,
the operation of the present invention will be described by taking the standard configuration
shown in FIG. 2 as an example. As described above, stereo signals (R and L 儒 signals) such as
stereo demodulation signals of a stereo receiver (not shown) are amplified to appropriate levels
through amplifiers AMP and AMP, and reproduced by speakers spR and spL. Part of the signal on
the side of C, 9R is a delay circuit, and the signal is lagged by 20 to 40 m 5 ec so that the size of
the aural space is given, and the variable resistor VR □, amplifier AMP, It is regulated to an
appropriate level and reproduced by the speaker SP1. Furthermore, a part of the L 儒 signal
delays the signal by 20 to 20 ms so that the delay circuit Dt, j: the size of the sensational space is
given, and the variable resistor VB, the amplifier Aap, is suitable. The level is regulated and
reproduced by the speaker SP. In addition, a part of the R-side output delayed by 20 to 40 m 5 ec
is further delayed by 20 to 40 m 5 ec so that the spread (size, width) of the former is given by
the delay circuit, and the resistor R 1 for coupling is delayed. It is applied to the input side of the
variable resistor VR, of the second reflection emission system via the variable resistor VR, the
amplifier AMP, and reproduced by the speaker SP. As described above, a part of the L side output
which is 120 to 40 m 5 ec is further delayed by 20 to 40 m 5 ec so that the spread (size, width)
of the former is given by the delay circuit DLt, and a resistor for coupling It is added to the input
side of the variable resistor VR, of the first reflection emission system via R4, and is reproduced
by the speaker SP via the variable resistor VR, the amplifier AMP. Furthermore, a part of the
output of the 9R side and L side signals delayed by 20 to 40 m5 ec is mixed via the combining
resistors R, R-, and the variable resistor VR, and the amplifier = AMP are suitable. Leveled and
played on Speaker SP Island,:. Therefore, in the service of the listening room End EndPage: in the
3 area SA, following the direct sound from the speakers spR, spL, 20 to 4 omsee @ 4 cx beaca
sp1. The first and second reflected sounds by sp and R side and L @ output respectively, and the
third reflected sound mixed with the speaker SP and the R side and L side signals after the same
time are further After 40 m 5 ee, the KIR signal is emitted from the speaker SP and the L @
scratch signal speaker SP 1 respectively.
After adjusting the volume level for direct sound of each of these reflections, adjusting the
interval gold of direct sound and each reflection, artificially creating reflections, the original
sound field (hall ) Can be played in the same place as the original sound in the actual place. The
operation of the speaker system of FIGS. 2 and 5 is substantially the same as that of FIG. 1, so the
description of each system will be omitted. In the present invention, since the reflected sound is
electrically generated, it is better to prevent the generation of the mechanically reflected sound
caused by-of the room or the like. Walls, in particular, to prevent direct sound reflections from
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the front speakers sp ,, SP. It is possible to put a sound absorbing material on the floor, ceiling,
etc. to prevent K from reflecting sound. As described above, the present invention delays the
direct sound to be emitted into the room and the direct sound by 20 to 40 m5 ec, delays the size
of the auditory space by 20 to 40 m 5 ec, and gives the volume spread respectively. Since the
reflection sound can be created and the reflection sound created artificially can be controlled
freely for the direct sound, the sound field reproducibility close to the original sound field is
always obtained according to the size of the listening room. It has an effect that it is possible to
obtain an echo time pattern preferred by adjustment.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a), (b) is an explanatory view of an echo pattern
at the time of stereo reproduction, FIGS. 2 to 4 each show an embodiment of the present
invention, and FIG. FIG. 5 is a block diagram of a standard speaker system in which a
reproduction method is implemented, FIG. 5 is a block diagram of the same <mm speaker system,
and FIG. 4 is a block diagram of a simple speaker system. DESCRIPTION OF SYMBOLS LIN ... L
side input terminal, RIN ... R111 input terminal. AMP1 to AMP, -fi width amount, VR, -VR,------------------------------------------------------------------------------------------------------------------------------- ... Delay circuit
8B. SS8 ... phase shift circuit, RR ... listening room. SA・・・サービスエリア。 Patent assignee
Japan Musical Instruments Manufacturing Co., Ltd. '', The same day JL, Hiro 'EndPage: 46, the
agent other than the above,), Shiyan EndPage: 5
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