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JPS5113561

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DESCRIPTION JPS5113561
[Phase] 4 channel playback device ■ Japanese Patent Application No. 46-31803 [Phase]
Application No. 46 (1971) published May 11 47-50801 @ Akira 47 (1972) December 26 @
inventor Sugiura Toshihiko Gunma Prefecture Juraku Oizumi-cho Oji Sakada 180 Tokyo Sanyo
Electric Co., Ltd. 出 願 Applicant Sanyo Electric Co., Ltd. Moriguchi City Keihan Hondori 2 of 18
The same as the Tokyo Sanyo Electric Co., Ltd. Detailed description of the invention The present
invention is a two-channel stereo device on the left and right rear The present invention relates
to a so-called speaker matrix-type 4-channel reproduction device to which a speaker is added,
and more particularly to a reproduction device for reproducing the level of reproduction sound
of the left and right rear speakers. As a simple method of creating a pseudo 4-channel sound field
from the conventional 2-channel sound source, there is a 4-matrix reproduction method of
speaker matrix [111111] EndPage: 1-pass system. This is to obtain left and right front signals
from a human power signal, obtain difference signals from the left and right front signals, and
apply this to the left and right rear speakers in reverse phase to construct a pseudo 4-channel
sound field by the reverberation effect. It is. However, in such a conventional four-channel device,
the levels of the signals (rear signals) emitted from the additional channels, that is, the rear left
and right speakers are fixed at a fixed ratio to the level of the human power signal, In addition,
since the level of the rear signal is extremely smaller than the level of the front signal, a sufficient
4-channel effect can not be obtained. The present invention provides a 4-channel regeneration
device which eliminates the above-mentioned drawbacks, which will be described below with
reference to the drawings. FIG. 1 is a block diagram of a commonly used two-channel
regenerator, FIG. 2 is a block diagram showing the principle of the four-channel regenerator of
the present invention, and FIG. 3 is an embodiment of the same device of the present invention.
FIG. 4 shows another embodiment of the same device of the present invention. , □ Generally, the
left and right channel systems are provided with negative feedback devices 3 and 4 respectively
for each amplifier 1.2 as shown in FIG. 1, and manual Li, Ri high output Lo, Ro, the amplification
degree of the amplifiers 1 and 2 is A, the feedback rate of the negative feedback devices 3 and 4
is β (β ≦ 1, and [111111] holds. The present invention further adds a negative feedback loop
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to FIG. 1, and is configured as shown in FIG. In FIG. 2, assuming that the feedback rates of 1N N 4
+ feedback devices 5 and 6 and second negative feedback devices 7 and 8 are β and β ′,
respectively, [111111] Ro = A (Ri−βRo−β′Lo) holds. When each equation is solved for Lo
and Ro, A ((1 + A.beta.) Li-A.beta.'Ri) Lo = .quadrature. (1 + A.beta.) 2. A2β2A ((1 + Aβ) Ri-Aβ'Li)
Ro = □ (1 + Aβ) 2-A2β'2 addition channel Lo-R as a rear signal.
When A is used, A (Li-Ri) Lo-Ro = .quadrature.1 + A.beta.-A.beta. 'Is obtained. Therefore, if the
feedback υ ′ of the second negative feedback device is changed from O to β in the above
equation, the left and right signals in front are ') LF and RF respectively. 1) 4 foils 1 component 1
° −1 ° "A (Li-Ri) @-A (Li-Ri) 1 + A.beta." Can be varied. Therefore, with regard to the front left
and right signals, as β 'changes from O to β, the signal amount of the other channel mixed in
the opposite phase to one channel increases, and the degree of separation between both channels
increases. Become. (This means that when writing a vector diagram, the angle between the
vectors representing both channel signals increases. On the other hand, regarding the rear left
and right signals, the level of the rear left and right signals can be changed as described above,
even if the manual signal of the amplifier 1 ° is constant. The amount of negative feedback is
reduced for the width devices 1 and 2. 9 and β 'become dogs, distortion increases. Also, as the
residual sound effect, one who made the β 'a dog. Therefore, the listener can adjust various
conditions by adjusting the second feedback device 7, 8 amount of marriage β '[111111]
EndPage: 2 FIG. 3 shows a circuit diagram showing an embodiment of the present invention
Reference numerals 9, 10 are input terminals, to which manual power signals Li and Ri are
respectively applied, and the manual powers Li and Ri are amplified by amplification transistors
11 and 12 which respectively constitute preamplifiers. The amplifying transistors 11 and 12
both have emitter resistors 13 and 14 for negative feedback. This corresponds to the first
feedback device in the above description. A series circuit consisting of a resistor 15, a variable
resistor 16 and a DC blocking capacitor 17 is provided between the emitters of the abovementioned transistors, which acts as a second feedback device in the above description and is
common to both L and R systems. It is an arrangement. The output signal of the transistor 11.12
is amplified by the main amplifier 18 ° 19 from the speakers 20, 21 and 22 ° 23 and LF (Lo),
RF (Ro), LR (Lo-Ro) and RR (Lo-Ro) respectively. ) Is played. By changing the variable resistor 16
in the above configuration, the level ratio of the (Lo-Ro) component to the human power signal
can be made variable, and at the same time, Aβ'Ri which is a heterogeneity signal in Lo and Ro.
Aβ'Li can be varied. In FIG. 3, switches SWI and SW2 indicate 4-channel and 2-channel
changeover switches. FIG. 4 shows another embodiment of the present invention, in which the
main amplifier changes the level ratio of the (Lo-Ro) component to the human power signal.
In FIG. 4, 24.25 are driver transistors, 26, 27, 28 and 29, 30, 31 are output transistors, 32 and
33 are output terminals, and four speakers are connected as loads as in FIG. Construct a matrix.
Emitter resistors 34 and 35 of driver transistor [111111] resistor 24 and 25 correspond to the
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first negative feedback device in the above description, the feedback ratio is β, and a series
circuit including resistor 36, variable resistor 37 and capacitor 38 The series circuit including the
resistor 39, the variable resistor 40 and the capacitor 41 corresponds to the second negative
feedback device in the above description, and the feedback rate thereof is β '. As described
above, according to the present invention, when the pseudo 4 channel reproduction apparatus is
configured by the speaker matrix, the level ratio of the (LR) component or the (RL) component
reproduced from the rear speaker can be varied. Get the benefit of being able to set the optimal
value. If the negative feedback component in the emitter resistance of the amplification transistor
is varied in the preamplifier and main amplifier stage as described above, the above effect can be
easily obtained.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a general two-channel
regenerator, FIG. 2 is a block diagram of a four-channel regenerator of the present invention, and
FIG. FIG. 4 shows another embodiment of the same device according to the present invention. 1,
2,..., Amplifiers 5, 6,... First negative feedback device, 7, 8... Second negative feedback device.
[Phase] Cited Reference Publication No. 36-22818 Radio Science Jan. 1971, pp. 177-178
Published by Japan Broadcasting Corporation [111111] EndPage: 3
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