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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are block diagrams for explaining the
conventional four channel and two channel switching circuit respectively, FIG. 3 is a block
diagram showing one embodiment of the present invention, and FIG. 4 is a circuit diagram of the
amplifier. AB: Amplifier, 104, 105, 204, 205, 304, 305, 404, 405: Emitter reverse bias resistance,
15-1 B .. Value switch, 11-14: Diode, 52 ... second stage transistor of amplifier, 10 B ... power
supply voltage. -53- real opening 49-137 518 (2) L four racks
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a 4-channel / 2-channel
automatic switching circuit. -4 independent amplifiers. When the 1
4 channel signal is to be
reproduced, each signal may be connected to each amplification system, but in order to
reproduce the 2 channel signal using such an amplifier, it is necessary to divide the human
power signal (FIG. 1 Or one line of signal must be disconnected (Fig. 2). -2 However, in the case
of all 2 channels, only the method of cutting one side of the signal as in the latter case. Can do
normal regeneration. -The present invention performs normal two-channel regeneration by
changing the bias of the transistor and turning on and off the regenerative ability of the amplifier
circuit without adding the above-mentioned signal processing system at random. , The time was
made to be able to take out sound from all four speakers connected through four independent
power amplifier circuits. It is a road. This will be specifically described below with reference to all
drawings of this invention. The prior art is shown in FIGS. 1 and 2, and the present invention is
illustrated in FIG. Figure 1 divides the input into Second line input. L signal to the third. Add an R
signal to the fourth system, 2 times 0. . Although it is not shown in the figure, the 4-2 channel
switching is to place a switch at the input part to connect and disconnect between the systems,
and the amplifier is always operating. In FIG. 2, two of the four human power signal sources are
selected and reproduced, and division is performed by switching on the way. In this method as
well, the amplifier is always operating. As described above, the conventional switching method
has a disadvantage that shock noise is generated in the switch of the input signal circuit, and
since the amplifier and the unit are always operating, unnecessary power consumption is large.
The purpose of the present invention is to eliminate the above-mentioned disadvantages of the
prior art, which will now be described by means of the embodiments shown in FIGS. 3 and 4. . An
example of this is the case of a car stereo, 2 channels. The signals required to reproduce the tape
cartridge are components of program A in FIG. 2 and components of glogogram B, but the
reproduction is either. To play one more program, Program Ai, cut the amplifier connected to the
program B (Q and 0. It is better not to operate in the off region. This is the theory of this
invention. The amplifier (5) shown in FIG. 3 (the amplifier (c) and 0.0 have the same structure) is
shown in FIG. 51.52 are first and second stage transistors, 53 to 58 are resistors, 59 to 60 are
capacitors, 101 is an input terminal, 102. 103 is a capacitor, 104. 105 is a resistor, and 106 is an
output terminal.
Based on the above theory, for example, in the case of a can stereo, if the program 1 is
reproduced, the program indicator power supply voltage + B is passed through the diode 11 via
the switch 11 to the predetermined 304.404 and 305.405. With the voltage applied to the
resistors 305 and 405 (corresponding to 104 ° 105 in FIG. 4), the amplifier (C1, the second
stage transistor of IJI (corresponding to 52 in FIG. 4) Bias, and thus the amplifiers 0. It is
something that cuts off the brows. In the case of program 2, the cutoff state continues similarly
through the diode 12 °. At the time of program 3, through the diode 13, through the switch 17
and the resistor 105. A reverse bias voltage is generated at '205, and hence the amplifier (G).
Keep @ cut off. The same applies to the program 40 o'clock. The extracted signal is split by
switch 15.16 'and added to the power amplifier. The switches 15 to 18 are interlocked switches,
and are automatically switched to the 40H side at the time of 4-channel regeneration and to the
2 · CH side at the time of 2-channel regeneration. As apparent from the above description, the
present invention cuts off all the transistors by applying a reverse bias voltage to the emitters of
the second stage which is unnecessary and 1... There are effects such as no generation of noise
and no, unnecessary power consumption.