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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a conventional 2, 4
channel switching audio reproducing apparatus, and FIG. 2 is a circuit diagram showing one
embodiment of the present invention. RVB ииииииииииииии Volume control variable resistor, AA, AB ииииии
Main and secondary channel differential amplifier, RAl, RA2 иииииииии Reverse coupling division
resistor, SA, SB ииии ... first and second channel switching switch, Co и и и и и и DC SawaNami capacitor.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device
for two-channel or four-channel audio reproduction output with a small number of circuit
switching points, which can be simply and easily reassembled into low-power four-channel and
high-output two-channel audio amplification reproduction output. To be a goal). The circuit
shown in FIG. 1 is used as a circuit for obtaining an output of an audio amplifier according to
process C according to the BTI (Performed transformer 7) method to obtain a multi-channel
stereo reproduction sound. That is, the audio input signal input to the input terminal (1) is
balanced to an appropriate amount of blue for each of the main channel (A) and the subchannel
(B) through the f amount adjustment variable resistor (RvB), In addition to the audio input signal
of the differential amplifier a (m), the king channel amplified audio output passes through the
coil of the main channel speaker (spA) through the direct 1ll F-wave capacitor (C0)! The channel
terminal and the auxiliary channel amplified audio output (2) is Okaji (DC F wave conden? The
first switch (81)% can be switched between the ground channel of the secondary channel
speaker, which is a 4-channel terminal via (C,), and the channel terminal side of the main channel
speaker coil is a 4-channel terminal, A third switch (S3) is provided to switch the ground 11 as a
channel insulator, and the audio input terminal of the sub-channel amplifier is the two channel
terminal on the ground side and the volume control variable resistor O sub-channel, 2- \ ? 4
channel The eighth switch (8,) for switching between terminals, the output side of the main
channel amplifier and the reverse input terminal of the panel. A switch for switching between the
four channels and the desired channel is inserted at four points of the fourth switch (S4) for
switching between the channel 5 '' terminal and the four channel terminal. Then, a resistance
value O, a reverse coupling resistor (R,) is leaked in a path for feeding back the output of the
main channel amplifier to the inverting input terminal of the-channel amplifier. In such
conventional 1111, when the above easW conversion-route is much stupid 9 or when switching
on the fly ($) \-car side,! The match between the switching contact position of the channel or 4
channel and the 2-channel or 4-channel terminal on the speaker side may be disrupted by the
loss of the wrong connection, which may lead to the destruction of the audio reproduction
device. The present invention is intended to eliminate obstacles caused by complicated switching
conventionally by reducing the number of switching circuits and the number of parts. : * It is
possible to extend the output up to the low range without generating a direct current potential
difference of Trj, and to provide a simple circuit configuration suitable for automatic switching by
remote control.
The embodiment of the present invention will be described below with reference to FIG. 2.
However, in FIG. 1, it is indicated with the same reference numeral as the sump port 6 or ri, and
the circuit shown in FIG. Although two pairs will be used, the main, -2 channel configuration will
be briefly described as a single group. The audio from both terminals of the volume adjustment
variable resistor (4) as a fader for taking the volume parameter to each differential amplifier (a)
and (m 8) of the Wang channel (A) and the subchannel (B) first A signal is taken out and applied
to the audio input terminal of the amplifier, and the respective outputs are sent out to the
speakers (spA) and (8FB) K of each channel, respectively. Here, each amplifier has characteristics
of amplification, input level, and output that are homogeneous. The speakers are cascaded with
each other, and the connection middle point thereof is set to the two channel terminals of the
amplifier output side of the sub channel speaker, and the DC E-wave capacitor ((! o) A first
channel changeover switch (IIA) is connected to connect the nineteenth channel terminal, and a
main channel amplifier (f). Grounding resistance in which a part of the output of) is connected to
the inverting input terminal of the auxiliary channel amplifier (3)! Inversion feedback split
resistors (RA,) and (RA,) are provided in series in a feedback path leading to a connection point of
I (R7) and the coupling capacitor (Oo). Then, a second channel switching switch (8B) is provided
to switch the intermediate connection point of this reverse coupling dividing resistor to a 4channel terminal and a 2-channel insulator which is an audio input terminal of the sub-channel
amplifier to the ground side. . Main coil, speaker coil t * (1) of each channel is connected, and the
high resistance for reverse coupling is divided and connected to the path which feeds back the
output of one main channel amplifier as the inverted input signal of the auxiliary channel
amplifier. As a result, a channel to the ground side is formed at the time of 4 channels, and a
channel to increase the output is formed by switching to the output side of the subchannel
amplifier at the time of 2 channels. Therefore, although four changeover switches for only two
channels and one capacitor for DC P wave on the speaker input side of each channel were
required conventionally, according to the present invention, the selector switch, the DC r wave
capacitor and 4 are used. We were able to halve each one. Also, while each loudspeaker serving
as an amplifier load is several ohms, and each amplifier has a ground resistance of several tens to
two hundred o'clock at 8 degrees, the two inverting coupling division resistors have impedance
ratios as large as several tens of ohms Therefore, at the time of 4 channels, the voice 'amplified
output terminal and the ground impedance tj] are high impedance alone, and for the II turtle, the
replacement resistor and the reverse coupling division resistor (RA,) in the latter stage Will be
inserted in parallel, but the dividing resistor O (и) impedance is much larger, mainly-?8? ?O?
57 О 6 ?? /, 2 <ft 16 c & # E &? и ? "X2f-Y7 *" RKaxe-1yv14mOi [IL can be made an OOL
configuration because there is almost no difference in position, and it becomes possible to extend
the power to the low frequency region, two channels (BTL Because a7 ada is not used, this
volume adjustment variable resistor can be operated in conjunction with the relay switch and
channel selector switch when one roll is finished to either one, and the audio reproduction
optimal for automatic remote control 1 It can also be an apparatus.
As described above, according to the present invention, the audio reproduction channels of the
differential amplifier and the speaker, which are distributed by the volume balance 7 ader shared
by the main channel and sub channel and receive the round audio signal, are cascaded of the
speaker coil and the main channel and sub channel By dividing and arranging reverse magnetic
memory pillow @ in the amplified output return path of the channel, the 4-channel side is
connected to ground, and the channel changeover switch and the direct-current cut capacitor are
halved and simplified respectively. It is possible to balance the volume even when the high power
of the spirit chan (Man) is KTh and to obtain the power uniformly to the low frequency range,
and to eliminate the trouble due to the misconnection of the changeover switch.
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