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JPS57174999

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DESCRIPTION JPS57174999
Description 1, title of the invention
Stereo playback device
3. Detailed Description of the Invention The present invention relates to a stereo reproduction
apparatus in which a load is connected between outputs of opposite powers of two power
amplifiers to enable rich low-pass reproduction. As a conventional stereo reproduction apparatus
of this type, one shown in FIG. 1 is known. In FIG. 1, L-CH is a left channel amplifier, C-CH is a
center channel amplifier, and R-CH is a right channel amplifier. An L-OH signal source 1 is
connected to the center channel increase EndPage: 1 width unit 23 through the internal power
amplifier 3 L of the L-OH power amplifier 2 and the coupling resistor 21 in the left channel 7 'LCH. . The L-CH power amplifier 2 is composed of internal power amplifiers 3L, 4L and an inverter
5L, and the inverting input end (-input end) of the internal power amplifier 3L is grounded via a
feedback resistor 7L '(r A feedback resistor 8L is connected between them. Furthermore, the
output end of the internal power amplifier 3L is connected to the non-inverting input end (ten
input ends) of the internal power amplifier 4L via the inverter 5L. The inverting input end of the
internal power amplifier 4L is grounded via a feedback resistor 9L, and a feedback resistor 8L is
connected between its input and output. Thus, the output terminals of the 0 internal power
amplifiers 3L and 4L whose feedback amplifiers are configured by the internal power amplifiers
3L and 4L, the inverter 5L, and the feedback resistors 6L to 9L are respectively L-CH speakers
via the capacitors 41.42 '. A coil 43 is connected to both ends of the oL-CH speaker 440
connected to 44. The right channel amplifier R-CH is also configured in the same manner. That is,
R-CH signal source 11 is connected to the non-inverting input terminal of internal power
amplifier 3 R of R-CH power amplifier 12 and connected to the non-inverting input terminal of
center channel power amplifier 23 via coupling resistor 22. It is done. The R-CH power amplifier
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12 is composed of internal amplifiers 3R and 4R, an inverter 5R, and feedback resistors 7R to 9R.
The inverting input terminal of the internal power amplifier 3R is grounded via a feedback
resistor 7R, and a feedback resistor 6R is connected between its input and output terminals. The
output end of the internal power amplifier 3R is connected to the non-inverting input end of the
internal power amplifier 4R via the inverter 5R. The inverting input terminal of the internal
power amplifier 4R is grounded via a feedback resistor 9Rf: and a feedback resistor 8R is
connected between its input and output. Each output terminal of the internal power amplifiers 3R
and 4H is connected to the R-CH speaker 64 via a capacitor 61.62.
A coil 63 is connected in parallel to the R-CH speaker 64. On the other hand, the center channel
amplifier 7'C-, CH is mainly composed of the center channel internal power amplifier 23, its
inverting input terminal is grounded via the feedback resistor 25, and the feedback resistor 24 is
between its input and output terminals. It is connected. The output end of the center channel
power amplifier is connected to one end of a C-CH (center channel) speaker 54 via a coil 51, and
this end is grounded. A capacitor 53 is connected to both ends of the C-CH speaker 54. Next, the
operation of the conventional stereo reproduction apparatus shown in FIG. 1 will be described.
First, the signal from the left channel signal source 1 of the left channel amplifier L-CH is the
internal power amplifier 3 of the L-CH power amplifier 2 Applied to the non-inverting input
terminal of the This applied signal is a feedback resistor 6L. Due to the system feedback by 7L,
the output of the internal power amplifier 8L appears amplified in phase with the input signal. A
part of the output of the internal power amplifier 3L is converted to the same amplitude
antiphase through the inverter 5L '(r, and then added to the non-inverted input end of the
internal power amplifier 4L. Receiving the effect gold, it appears in the form of an antiphase with
the input signal at the output end of the internal power amplifier 4L. Therefore, it passes through
a noise filter with capacitors 41 and 42 and a coil 43 connected to the in-phase output terminal
(terminal in the figure) and the negative phase output terminal (output terminal e in the figure)
of the L-CH power amplifier 2 The L-CH speaker 44 is driven by the L-CH power amplifier 2. In
addition, since the right channel amplifier R-CH is similarly configured, an output signal in phase
with the signal from the R-CH signal source 11 appears at the output end of the internal power
amplifier 3R, and an output signal in reverse phase is output. It appears at the output of the
internal power amplifier 4R. The in-phase output signal and the anti-phase output signal are
respectively connected from the in-phase output end (marked with e) and the anti-phase output
end (marked with θ) capacitors 61 and 62, coil 6 ° 3 R-CH S? -A signal from the L-CH signal
source 1 and a signal from the R-CI (EndPage: 2 signal source 11) are respectively synthesized by
the coupling resistance 21 ° 22 and the non-center channel power amplifier 23 is The
combined signal of the L-CH multiplied signal R-CH multiplied signal is amplified to be present at
the output terminal under the feedback effect of the feedback resistor 24 ° 25 applied to the
inverting input terminal.
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The composite signal flows through the low pass filter of the coil 51 and the capacitor 53 to the
center channel speaker 54. That is, the center channel speaker 54 is driven by the center channel
power amplifier 23. Since the conventional stereo reproduction apparatus operates as described
above, the L-CH speaker 44 reproduces the high frequency component of the L-CH signal, and
the R-CH speaker 64 reproduces the R-CH double signal high frequency component. Further,
since the center channel speaker 54 reproduces the low frequency components of the signals of
both channels, rich stereo reproduction of low frequencies is possible. Since the conventional
stereo reproduction apparatus is configured as described above, in order to reproduce rich low
frequencies, in addition to the two power amplifiers for L-CH and R-CH, a center dedicated to low
frequency reproduction is also provided. Channel power amplifier 1 [unit 23 must be provided,
and furthermore, if it is necessary to perform L-CH double signal R-CH double signal synthesis,
the cost increases because the circuit increases. There was a drawback of The present invention
has been made to eliminate the above-mentioned conventional drawbacks, and comprises a
balanced output type power amplifier having an output end in phase with an output end in phase
with an input signal and an L-CH internal power amplifier, R-CH internal power amplifier, with all
speakers connected to the output end of each power amplifier, and by connecting a speaker
between the opposite polarity output ends of these two power amplifiers, the circuit
configuration can be simplified at low cost. It is an object of the present invention to provide a
stereo reproduction apparatus capable of performing low-frequency reproduction with richness.
Hereinafter, an embodiment of a stereo reproduction apparatus of the present invention will be
described based on the drawings. FIG. 2 is a circuit diagram showing the configuration of one
embodiment. In this FIG. 2, in order to avoid duplication, the same parts as in FIG. 1 are assigned
the same reference numerals and their explanations are omitted, and parts different from FIG. 1
will be mainly described. As apparent from comparison of FIG. 2 with FIG. 1, the left channel
amplifier L-CH and the right channel anzo R-CH are configured in the same manner as FIG. 1, so
the description thereof is omitted. . Further, the center channel amplifier C-CH in FIG. 1 is
omitted in FIG. The output end of the internal power amplifier 3L and the output end of the
internal power amplifier 4L in the left channel amplifier L-CH are respectively the in-phase
output end (■ mark) and the negative phase output end (marked e), the capacitors 41 and 42,
and the coil 43 Is connected to the L-CH speaker 44 via the bypass filter according to FIG.
Similarly, the output terminal of the internal power amplifier 3R for the left channel amplifier RCH and the output of the internal power amplifier 4R are the in-phase output end (-marked), the
negative phase output end (.theta.-marked), the capacitors 61 and 62, and the coil The same as in
FIG. 1 is also connected to the R-CH speaker 64 via a bypass filter according to 63. 0 However,
the embodiment of FIG. 2 is different from FIG. 1 in the following points . That is, the QC-CH
speaker 54 provided with the bowl 58 of the C-CH speaker 54 is connected via the coil 51 to the
output end of the internal power amplifier 3L of the left channel amplifier L-CH. At the same
time, the output terminal of the internal power amplifier 4R of the right channel amplifier R-CH
is connected via the entire coil 52. A capacitor 53 is connected to both ends of the C-CH speaker
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54. The capacitor 53 and the coil 51.52 constitute a low pass filter. Further, one end of the C-CH
speaker 58 is connected to the output end of the internal power amplifier 4L of the left channel
amplifier L-CH via the coil 55, and the internal power of the right channel amplifier R-CH via the
coil 56 It is connected to the output end of the amplifier 3R. A capacitor “57” is connected to
both ends of the C-CH speaker 58. A low pass filter is configured by the capacitor 57 and the coil
EndPage: 355.56. Next, the operation of the stereo reproduction apparatus configured as
described above will be described. The signal from L-CH signal source 1 is applied to the noninverting input of L-CH iii power amplifier power amplifier chamber power amplifier 3L. The
signal applied to the non-inverted input end is subjected to negative feedback effect by feedback
resistors 6L and 7L, amplified at the output end of the internal power amplifier 3L in phase with
the input signal and output. A part of the output end of the internal power amplifier 3L is
converted to the same amplitude antiphase through the inverter 56 and then added to the noninverted input end of the internal power amplifier 4L, and negative feedback is performed by the
feedback resistors 8L and 9L. Under the effect, the signal is output to the output end of the
internal power amplifier 4L in the form of the phase opposite to that of the input signal. As a
result, the L-CH speaker 44 passes through the noise filter of the capacitors 41 and 42 and the
coil 43 to produce an output signal in phase with the input signal from the internal power
amplifier 3L and an input signal from the internal power amplifier 4L. It is driven by the opposite
phase output signal. Since the right channel amplifier R-CH is configured in the same manner as
the left channel amplifier 7'L-CH, the signal from the R-CH signal source 11 is applied to the noninverted input terminal of the internal power amplifier 3R and is fed back by the feedback
resistor 6Rt7H. Due to the negative feedback effect, an output signal in phase with the input
signal is output at the output terminal of the internal power amplifier 3R.
A part of this output signal is converted through the inverter 5R into a signal of the same
amplitude and in antiphase, applied to the non-inverting input end of the internal power
amplifier 4R, and further subjected to a negative feedback effect by the feedback resistors 8R
and 9R. An output signal of reverse phase to the input signal is output to the output terminal of
the internal power amplifier 4R. The in-phase output signal at the output end of the internal
power amplifier 3R is applied to the R-CH speaker 64 via the capacitor 61 'vil-, and the antiphase
output signal at the output end of the internal power amplifier 4R is via the capacitor 62. It is
added to the R-CH speaker 64. That is, the R-CH speaker 64 is driven by the in-phase output
signal and the anti-phase output signal from the internal power amplifiers 3R and 4R through all
bypass filters by the capacitors 61 and 62 and the coil 63. Thus, the L-CH speaker 44 is driven
by the positive phase output signal and the negative phase output signal of the C-CH power
amplifier 2, and the R-CH speaker 64 with the positive phase output signal of the R-CH power
amplifier 12. It is driven by the output signal of opposite phase. In addition, the C-CH speaker 54
has a positive-phase output signal added to the input signal from the internal power amplifier 3 L
of the L-CH power amplifier 2 via the coil 51, and the R-CH power throughout the coil 52. From
the output end of the internal power amplifier 4R of the amplifier 12, an output signal in reverse
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phase to the input signal is added. Therefore, this C-CH speaker 54 is driven by the positivephase output signal of L-CH power amplifier 2 and the reverse-phase output signal of R-CH
power amplifier 12, and this C-CH speaker 54 is driven by L-CH and The acoustic reproduction of
R-CM mixture (passing the low spring filter by the coils 51 and 52 and the capacitor 53 and
adding only the low frequency component) is performed. Similarly, the C-CH speaker 58 has an
output signal in reverse phase to the input signal of the L-CH power amplifier 2 applied through
the coil 55, and an in-phase output signal for the R-CH power amplifier 12 through the coil 56.
Output signals are applied O These in-phase output signals and out-of-phase output signals are
passed through a low pass filter with a coil 55 ° 56 and a capacitor 57 to take out only low
frequency components, and obtain L-CH and R-OH. Note that the sound is reproduced with mixed
low-frequency components O However, all the speaker polarities are selected so that the C-CM
speaker 54.58 is acoustically the same 0 In the above embodiment, the left channel anzo L-CH,
in-phase reverse of right channel amplifier R-CM. Although two C-CH speakers 54.58 enable rich
low-pass reproduction by combining two output terminals of the phase, as shown in FIG. One
power transistor may be sufficient) f: By connecting it to one C-CH speaker EndPage: 454, even a
low impedance center channel can be sufficiently driven. Area regeneration is possible.
Specifically, the C-OH speaker 58 shown in FIG. 2 and the coils 55 and 56 for driving the Ro and
filter attached thereto and the capacitor 57 are omitted, and the internal power amplifier 3L of
the left channel amplifier L-CH The output terminal of the positive phase of this is connected to
one end of the C-OH speaker 54 via the buffer antenna f71 and the coil 51, and the output
terminal of the reverse phase of the internal power amplifier 4R of the right channel amplifier RCH is a buffer An f72 is connected to the other end of the C-OH speaker 54 via a coil 52. The
entire low pass filter is constituted by the coil 51 ° 52 and the capacitor 53 as in FIG. This
arrangement as shown in FIG. 3 is particularly effective in a portable stereo reproduction
apparatus with a low power supply voltage. Further, in the above embodiment, the improvement
of the low frequency reproduction is performed in the stereo reproduction, but as shown in FIG.
4, the C-OH speaker 54.58 uses a high frequency reproduction speaker such as a tow If the
sound phase of one C-OH speaker 54, 5.8 is reversed and all the sound output of one C-CH
speaker is variable, the phase rotation of the mixed signal of the high frequency component of
the left channel and the right channel is It can be easily done spatially. Therefore, the same effect
can be obtained also as a stereo feeling improvement device (a combination capable of
performing both low-pass reproduction improvement is also possible) 0 In FIG. 4, the capacitor
41 ° 42 and coil 43 in FIG. 2 and the coils 63 and 63 are omitted, and a capacitor 73.74 is used
in place of the coil 51.5 in FIG. 2 and a capacitor 73.74 is used in place of the coil 51.5 in FIG. In
place of the capacitor 53, a coil 75 is used. Furthermore, in the portion of the C-OH speaker 58, a
capacitor 76 ° 77 is used in place of the coil 55. 56 of FIG. 2, and a coil 78 is used in place of
the capacitor 57. Attenuation resistor 79 is inserted at one end of. As described above, according
to the stereo reproduction apparatus of the present invention, an L-CH speaker and an output
terminal of the left channel amplifier and the right channel amplifier that generate all the output
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signals of the same amplitude and in phase and in phase with the input signal are respectively
generated The R-CH speaker is connected, and the C-CH speaker driven only by the lowfrequency component is synthesized with the output of the left channel amplifier and the output
of the right channel amplifier to be added to perform low-frequency sound reproduction.
Therefore, "the center channel amplifier can be made unnecessary for improvement of low-pass
reproduction 0. Along with this, the circuit configuration can be simplified as well as it can be
inexpensive, and rich low-pass reproduction can be all possible, quality improvement Can be
expected.
Also, if one C-CH speaker is used for full high-frequency reproduction, it can simultaneously
become a stereo feeling improvement device, and sufficient output can be obtained even if the
power supply voltage is low, so excellent effects such as portability can be obtained Play.
4. Brief Description of the Drawings FIG. 1 is a circuit diagram of a conventional stereo
reproduction apparatus, FIG. 2 is a circuit diagram of one embodiment of the stereo reproduction
apparatus of the present invention, and FIGS. 0L-CH: Left channel amplifier, R-OH: Right channel
amplifier, 1 ... L-CH signal source, 2 ... L-CH. Power amplifier, 3L, 4L, 3R, 4R ... internal power
amplifier, 5L, 5R ... inverters 6L to 9L. 6R to 9R: feedback resistance, 44: L-CH speaker, 41.42,
52, 57, 61, 62, 73, 74 ° 76 # 77: capacitor, 43, 51 # 52, 55 ° 56.63, 75t 7 B: coil, 54. 58 C-CH
speaker, 79: attenuation resistance Note that the same reference numeral in the figure indicates
the same or the same part 0 agent Shino Ogino-EndPage: 5
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