JPS506762

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DESCRIPTION JPS506762
■ Multi-purpose sound field creation method ■ Japanese Patent Application No. 45-83699
[Phase] Application No. 45 (1970) September 25 @ inventor Ito Akesuke Tokyo 14 Tokyo
Metropolitan area Izumi 2 Suginami-ku Izumi Akira Ishida 0 14 1 [phase] Agent patent attorney
Takehiko Suzue 3 persons outside Sansui Electric Co., Ltd., Tokyo, Tokyo, Suginami Ward Izumi 2
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of
the present invention, FIG. 2 is a main part connection diagram of the embodiment, and FIG. 3 is
a diagram showing an arrangement configuration of speakers in the embodiment. .
Detailed Description of the Invention The present invention combines two original signals, such
as binary stereo signals, to extract a quaternary signal consisting of a sum signal and a difference
signal, and radiates these signals into a universal space by means of a speaker. The present
invention relates to a multiple sound field creation method that creates a new sound field by In
the so-called binary stereo reproduction method, the left signal and the right signal of the binary
stereo signal are respectively radiated to the common space from the speakers arranged on the
listener Q diagonally front left and right. 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. Here, the sense of reality is, as can be seen
from the example of the performance venue, the relationship between the sound directly
reaching the audience (direct sound) and the many reflections (indirect sound) produced by the
wall of the venue etc. That is, it can be provided by the phase difference between the direct
sound and the multiple reflected sounds, the direction difference, the volume difference, etc.
[111111], and it is not an acoustic phenomenon based on just reverberation. The present
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invention combines and extracts quaternary signals consisting of different sum and difference
signals based on two original signals, and at least one of the two difference signals is phaseshifted and phase-modulated. By emitting these signals and the above-mentioned sum signal to a
common space by a plurality of speakers arranged with a predetermined relationship, by creating
a condition similar to the correlation between direct sound and reflected sound in a performance
hall etc. An object of the present invention is to provide a multiple sound field creation method
for creating a new sound field with so-called sense of presence. An embodiment of the present
invention will be described below with reference to the drawings. In FIG. 1, 1 and 2 are
manpower ends which are applied to the right signal hole and left signal of the binary stereo
signal respectively. 6, two different sum signals (R (1-.DELTA.). DELTA.L), (L (1-.DELTA.).
DELTA.R), and two different difference signals (R (1-.DELTA.)) From the signals R and LL. Fig. 2
shows an example of the specific connection of the extraction circuit for extracting-/ L) and (L (1Δ ')-ΔQi). That is, reference numerals 21 and 22 in FIG. 2 are amplifiers which receive the right
signal R and the left signal, and can change the amplification degree of the husband (1 for G = 2)
interlockingly. The outputs of these amplifiers 21 and 22 are respectively supplied to the bases
of NPN transistors 23.24 via capacitors. Here, each voltage amplification degree of the
amplification circuit by these transistors 23. 24 is equal to 1 at both the emitter and the
collector, that is, when the signal applied to the base is N, Set the signal to be N, -N.
Thus, the collector of the transistor 23 is connected to the emitter of the transistor 24 via the
capacitor 25, the resistors 26 and 27 and the capacitor 28 respectively, and the connection point
of the resistors 26 and 27 is connected to the input terminal of the amplifier 29. Similarly, the
emitter of the transistor 23 is connected to the collector of the transistor 24 via the capacitor 30,
resistors 31 and 32, and Ende [111 111] EndPage: 1 sensor 33 respectively, and the connection
point between the resistors 31 and 32 is an amplifier 34. Connect to the input terminal of. The
amplification degree of each of the amplifier 34 and the amplifier 29 is set to G = 2. Further, the
connection point between the capacitor 30 and the resistor 31 is connected to the connection
point between the resistor 27 and the capacitor 28 via the resistors 35, 36, 37. The connection
between the resistors 35 and 36 is the output terminal 38, the connection between the resistors
36 and 37 is the output terminal 39, the output terminal of the amplifier 29 is the output
terminal 40, and the output terminal of the amplifier 34 is the output terminal 41. Connect to
each. If the extraction circuit 3 is configured as described above, the ratio of the resistors 26 and
27, the ratio of the resistors 31 and 32, and the ratio of the resistors 35, 36 and 37 can be
appropriately set to input terminals 1 and 2. For each input signal R2L to be applied, the signals
generated at the output terminals 38.39 are 1 (R (1-.DELTA.). Times..DELTA.L), K1 (L (1-.DELTA.).
Times..DELTA.R), and output The resulting signals can be 1 to 2 (R (1-.DELTA. ') To .DELTA.'L)
and K1 to 2 (L (1-.DELTA.1.DELTA.'R). Thus, as shown in FIG. 1, the signal of the output terminal
40 is connected to the input terminal of the first phase shifter 4 and the output terminal 41 is
connected to the input terminal of the second phase shifter 50. The first phase shifter 4 has a
characteristic of advancing the phase of a signal having a predetermined frequency or more by
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90 degrees, and the second phase shifter 5 has a characteristic of delaying the phase of a signal
having a predetermined frequency or more by 90 degrees. The outputs of the phase shifters 4, 5
are phase-modulated by the phase modulators 6, 7, respectively, amplified by the power
amplifiers 8, 9, and supplied to the speakers 10, 11. The output signals generated at the output
terminals 3B and 39 are respectively amplified by the power amplifier 12.13 and supplied to the
speaker 14.15. Then, as shown in FIG. 8, the speakers 14 and 15 are disposed, for example,
diagonally to the right and left of the listener 42 in the room, and the speakers 10 and 11 to the
diagonal right and left of the listener 42, respectively. Deploy. In FIG. 1, reference numerals 16
and 17 denote modulation signal generators of the phase modulators 6 and 7, respectively. If
configured as described above, the speakers 14 and 15 disposed in front of the listener 42
generate 1 (L (L) for the sum signal of the right signal R and the left signal. 1−Δ) and ΔR) are
respectively radiated in phase.
On the other hand, from the speakers 10 and 11 disposed behind the listener 42, the difference
signal between the right signal R and the left signal is 1 to 2 (R (1-Δ ') = Δ' L to 1 to 2)
[1111111 (L (1-Δ ′) − Δ / rt,) is phase-shifted by phase shifters 4 and 5 with a phase shift
characteristic of + 90 ° and 90 °, respectively, and then phase-modulated by phase modulators
6 and 7 Modulated and emitted. That is, although the signals radiated from the speakers 14 and
15 disposed in front of the listener 42 are in phase, the signals radiated from the speaker 10
disposed behind the listener 42 are 90 degrees with respect to these signals And the signal
radiated from the speaker 11 has a delay phase of 90 degrees, so the signals radiated from the
speakers 10 and 11 are phase shifted relatively by 180 degrees, and R = L. At the same time,
these sounds are phase-modulated by the phase modulators 6 and 7, respectively. Thus, these
sounds reach the listener 42 with a phase difference from one another. Also, since the sound
radiated from each speaker is the sum signal and the difference signal of the right signal R and
the left signal as described above, the average sound level by the spatial synthesis of these
sounds is the right signal According to the magnitudes of R and the left signal and the mixing
ratio and separation ratio of the right signal R and the left signal, the following is obtained. That
is, since the sound obtained by the speakers 14 and 15 is space synthesis of the sum of both
signals, the sound level of the synthesized sound increases as the right signal R and the left signal
become large (the sound becomes large. On the other hand, with regard to the sound obtained by
the speakers 10 and 11, the sound level of the synthesized sound emitted from the speaker 10 is
lowered to, for example, keeping the right signal R constant, since it is the difference between the
two signals. The sound level of the difference sound emitted from the speaker 11 also drops to a
negative value beyond zero when the right signal R is increased while keeping the left signal
constant. And since the spatial synthetic sound obtained by the speakers 10 and 11 is the
difference between the rain sounds, the sound level is substantially zero at the approximately
intermediate position between both the speakers 10 and 11 and becomes the speaker 10 side or
the speaker 11 side Sound level increases. Further, it is apparent that the position of the audible
sound image by the sound radiated from each of the speakers 10, 11, 14, 15 is moved by the
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level difference between the right signal R and the left signal. Thus, the sound radiated from the
four speakers 10, 11, 14 and 15 respectively and synthesized in that space reaches the listener
42 with the phase difference, the direction difference and the volume difference. , [111111]
EndPage: to create a condition substantially equal to the interaction between direct sound and
indirect sound such as 2 and, therefore, to raise the sound effect as if the listener 42 is also in the
performance hall Can.
In FIG. 2 shown as one embodiment of the extraction circuit, variable resistors are used instead
of the resistors 26 and 27 and the resistors 31 and 32, respectively, and the value of one variable
resistor is increased. Interlocking so as to decrease the value of (R (1-.DELTA..DELTA.'L) 'and (L
(1-.DELTA.')-. DELTA./u) of the signals respectively transmitted to the output terminal 40.41.
Among them, since Δ / B′Δ′L can be arbitrarily and interlockedly changed, it is possible to
more easily perform the adjustment for improving the above-described acoustic effect. Further,
as the modulation signal generator 16.17, besides the low frequency oscillator, an input signal,
internal noise of a transistor or the like may be used. Furthermore, as the phase shifters 4 and 5,
as in the embodiment, the phase shift characteristics may be any characteristics that do not
necessarily have to be advanced or retarded by 90 degrees above a predetermined frequency.
However, in that case, the sound radiated from the pair of speakers disposed behind the listener
must be made to be substantially in antiphase when R = L, so depending on the phase shift
characteristics of the phase shifter, An inverting circuit or the like is required. It is a matter of
course that the invention can be implemented with various modifications without departing from
the scope of the invention [111111]. As described above in detail, according to the present
invention, a quaternary signal composed of different sum signals and difference signals is
synthesized and extracted based on two original signals such as binary stereo signals, and the
two difference signals Method of creating a new sound field by phase-shifting and phasemodulating, and emitting these signals and the sum signal to a common space by a plurality of
speakers arranged in a predetermined relationship, thereby creating a new sound field. Can be
provided.
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