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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a stereo reproduction
apparatus according to an embodiment of the present invention. 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и. ??
DETAILED DESCRIPTION OF THE INVENTION The present invention is a stereo reproduction
device KIIL, in particular a pair of left and right channels, and mainly bass reproduction. The
present invention relates to a stereo reproduction apparatus configured to obtain good stereo
reproduction sound by means of a center channel. For the purpose of enhancing especially the
lower range of the stereo tone reproduced from the left and right two sets of speaker systems.
Using the fact that the sense of localization in the low-pitched range is indeterminate, it is
recommended to provide a third speaker system for the center channel, located between the two
speaker systems, by lip-rutynl-ny. It is being done. The signal supplied to this third speaker
system takes out the sum signal of the stereo signal from the output of the preamplifier, passes
this low signal through a low pass filter, and supplies it to the power amplifier for the center
channel. And obtained by K. However, the addition of a low pass filter and a power amplifier only
for the enhancement of the low range is not good for the effect obtained. SUMMARY OF THE
INVENTION The purpose of the present invention is to provide an improved stereo reproduction
apparatus that can obtain a center channel output sufficient to drive a speaker system for the
center channel without adding a power amplifier for the center channel. is there. An embodiment
of the present invention will be described with reference to the drawings. In FIG. 1, reference
numerals 1 and ? indicate preamplifiers for left and right signals. On the other hand, if it is t, the
preamplifier l for the left signal amplifies the left signal supplied with its manual power i ? and
supplies its output to the input terminal of the power amplifier 48-84201-0.3 JO. , The speaker
for the left channel has been reduced in the amount of normal phase. On the other hand, the
right signal amplifier is supplied to its input end to amplify the right signal, and the output
thereof is supplied to the input end of the power amplifier 10 for the right signal through the
transfer 11 j. This transport S acts to transport the right signal passing through it so as to shift it
by 180 degrees with respect to the left signal, so that at the output of the power amplifier 1 for
the right signal, it is reversed with respect to the left signal. Outputs that are in correlation
should be generated. A speaker for the right channel is connected in reverse phase to the output
end of the right signal power amplifier 6. Therefore to the left 1 'ne "y, to! -1ye and right 1 'for'-.
The peak cuff generates sound waves in phase with each other. For the speakers and 7, if they
are for the middle and high range, the capacitor C and the coil L are used to prevent
disconnections and other accidents caused by the low frequency signal being supplied. It is
desirable to insert a high-pass filter consisting of
However, if Soby, aq-11ta '+ ni-na kada ? and 7 can reproduce sufficiently to the bass range, this
high-pass filter can be omitted. Furthermore, the output of the left signal power amplifier J A
speaker 1 for the center channel is connected between one of the ends and one of the output
ends of the right compensation power supply 1 and 0. The speaker 1 has sufficient bass
reproduction capability, and a low-pass filter composed of a capacitor C and a coil L is used to
rapidly cut off a signal of a predetermined frequency or more. The ? signal supplied to the input
terminal of the speaker g for the sen-channel corresponds to the sum signal of the left signal and
the right signal because the phases of the signals in the power amplifier 3 and 1 are opposite to
each other. Thus, this speaker j generates a sound wave corresponding to the bass component
signal contained in the left signal and the right signal. The sound effect obtained by this K is the
same as 4 obtained using the center channel power amplifier for operating the center channel
speaker by amplifying the sum signal of the left and right signals 14) And jL good sound effects
can be obtained without the need for the addition of a center channel power amplifier. And a
speaker for a sen-channel connected to the power amplifier J for the left signal and the power
amplifier 6 for the right signal. Since t lowers the load impedances of these power amplifiers J
and 40, when a general transistor type power amplifier capable of obtaining a larger output
when the load impedance is smaller, the power amplifier J is used. The same effect is obtained as
the power of the and cocoons is substantially increased.
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