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JPS4940281

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DESCRIPTION JPS4940281
■ Sound reproduction apparatus □, ■ Japanese Patent Application No. 45-92158:, ぐ, [phase]
application show 4. '5 + (1970) October 20: 1:-0 shot, brave man Kaneko Kenkichi: Brave image
... 15- 膳 "" "" "" "" 6 applicant of 1923 of Nishijima-cho, Hamamatsu city Kawai Musical
Instruments Manufacturing Co., Ltd., vinegar
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a basic block diagram according to the present
invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3
is a diagram of a random signal generator and a signal control circuit FIG. 4 is a block diagram
showing a specific example of the relationship, FIG. 4 is a transistor circuit diagram located
between the signal control circuit, FIG. 5 is a frequency characteristic diagram of the signal
control circuit, and FIG. FIG. 6 is a circuit diagram of an embodiment of a band pass filter in the
control circuit.
DETAILED DESCRIPTION OF THE INVENTION The main object of the present invention is to
obtain a multi-channel stereo sound field in a pseudo manner from a two-channel stereo signal,
and random one or more arbitrary frequencies obtained from white noise etc. The purpose is to
generate a multi-dimensional sound field generated by a direct sound wave and a complex
indirect (reflected) sound wave in a large space such as a concert hall as a two-channel stereo
signal using amplitude change. The sound field in a live concert hall is formed by a direct sound
wave that directly reaches the listener's ear from the instrument, and an indirect sound wave that
is reflected and reached by a wall, a ceiling or the like. Indirect sound waves have various
directions, and at the same time, have a complex delay with respect to the direct sound waves,
and the phase shift is not constant, and all of them change from moment to moment. Analysis of
these complex phenomena at an arbitrary frequency reveals that the indirect sound wave is
changed in the composition of harmonic components by F144444l along with the relative delay
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and relative phase change with respect to the direct sound wave. . That is, the sound wave
emitted by the instrument is very random TimberVibrat while reaching the listener's ear. You can
think that the effect is given. The present invention applies the random TimberVibrato effect to
the conventional two-channel stereo signal based on the above analysis results, and emits this
signal from the rear speaker of the stereo listener, for example, and the conventional two-channel
stereo signal from the front speaker The concert halls etc. (It is possible to obtain a complex
sound field equivalent to a live performance in a small space in a small space. FIG. 1 is a block
diagram showing the basics of the present invention. Reference numeral 1 denotes a left channel
signal source 5.2, and a right channel signal source. These output signals are emitted from the
respective speakers 5 and 6 through the amplifiers 3 and 4, respectively. Reference numeral 7 is
a left / right signal combining circuit for converting stereo signals of left and right channel signal
sources 1 ° 2 into monaural signals, and an output signal of the circuit 7 is a signal composed of
a low pass filter, a bypass filter and a plurality of band pass filters. It leads to the control circuit 8
and the respective output signal of the control circuit 8 is emitted from the speaker 10 through
the amplifier 9. Then, one or more output signals of the random signal generator 11 using white
noise or the like are applied to the signal control circuit 8 to control the output signal of the
combining circuit 7. Since the amplitude of the output signal of the random signal oscillator 11
using white noise or the like changes randomly with time, this output signal causes the cutoff
frequency of each filter of the signal control circuit 8 to change randomly with time.
That is, if the signal control circuit 8 applies the TimberVibrato effect randomly for each of a
plurality of frequency components, and emits this signal from, for example, the speaker 10
positioned behind the listener, such as a concert hall or the like in a small room (small space).
You can enjoy live music in such a large space rl11111NEndPage: 1. The block diagram of FIG. 2
is a signal control circuit 8at 8b, amplifiers 9a and sb, and a speaker 10a. The IUb and the IUb
are provided in two series, and the case where the speaker 10a is located at the left rear of the
listener and the speaker 10b is located at the right rear is shown. Therefore, two random signal
generators 11a and 11b using white noise and the like are also provided. However, only one
signal control circuit 8a, sb 'is provided. :,! Je! 6. J:ヶよいうよア、ヶい。 -Toni: '□' ''
Random signal generator 4 point and signal control circuit 8 · · · · · · ■ ■ Kakaga unNJk? "L," "I,
Iyo 2 o ゎ, □, □ ° '□ I, as shown in Fig. 3 and Fig. 4, first from Whiten, 11111' ■ Cabinet Is
Generator W It leads to a plurality of filters F (F1 to F4) as output signals. These output signals
are subjected to CE division or the like by a plurality of transistor circuits T (T1 to T4) 1 as
shown in the specific example in FIG. 4, and the low pass filter L1 of the next stage: “7”,
“A2” zlH8 , And 7 <7 pA, 7. It is led to the signal control circuit 8 in combination with life
vectors B1 to B7. The band pass filters B1 to B7 are a combination of the bypass filters H1 to H7
and the low pass filters 2 to L8, and their frequency characteristics are shown in FIG. FIG. 4
guides the output signal of the filter F1 to the transistor circuit T1, the signal of the collector to
the low pass filter L1 and the bypass filter H2, the signal of the emitter to the bypass filters H4
and H6 of the band pass filter B4, and Control signals. However, the output signal of the filter F
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can be freely led to the signal control circuit 8 via a circuit other than the transistor circuit T
shown in FIG. 4, and the output signal of the filter or F can be directly transmitted to the signal
control port: path 8 It is also free to lead to. 1 FIG. 6 shows an example of a circuit diagram of the
band pass filter B1 of the control circuit 8 □: a bias voltage E is given to the diodes DI and B2 in
advance, and a random circuit from the transistor circuit T2 is used. By supplying a random
output signal from the transistor circuit T3 to the bypass filter H1, the resistance of the diodes DI
and B2 changes at random as the resistance of the diodes DI and B2 changes. The cutoff
frequency of each changes at random.
Therefore, the Q of the band pass filter B1 also changes randomly, the center frequency also
changes randomly, and the nobels also change randomly. Likewise, the other band pass filters B2
to BT, the low pass filter L1 and the bypass filter H8 of the signal control circuit 8 change from
moment to moment to control the signal from the combining circuit 7 at random. As described
above, according to the present invention, it is possible to obtain the same effect as a live
performance in a large space such as a concert hall by a conventional two-channel stereo signal
even in a small room (small space). As means for obtaining a random signal to be controlled,
there are various methods such as a method of obtaining a random signal by combination of a
plurality of oscillators in addition to a method of utilizing white noise by a zener diode or a
transistor.
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