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DESCRIPTION JPS57200981

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DESCRIPTION JPS57200981
Description 1, title of the invention
Signal switching device in acoustic system
8. Detailed description of the invention The present invention relates to a signal switching device
in an acoustic sequence, and more particularly, in an acoustic system which automatically selects
an acoustic source device such as a tuner, a player or a tape recorder according to a signal from
the acoustic source device. The present invention relates to a signal switching device.
Conventionally, in an acoustic V component consisting of an acoustic source device such as a
tuner, a player, a player or a tape recorder, an amplifier for amplifying an output signal of the
acoustic source device, and a speaker, a function selector switch for selecting the acoustic source
device is provided on the amplifier side. According to the acoustic source device used by the user
of the acoustic system, the function changeover switch is switched. As described above, when
selecting the sound source device by switching the function selector switch, it is necessary to
switch the function selector switch each time the sound source device to be used EndPage: 1
changes, and the operation of the sound system is There was a drawback that was complicated
and troublesome. The present invention has been made in view of the above-mentioned
circumstances in a conventional acoustic system, and an acoustic start device side is provided
with an operation start signal generating circuit for outputting an operation start signal of these
acoustic sound devices to a signal output terminal. By providing an input source selection
switching circuit on the side and causing the input source selection switching circuit to select an
acoustic source device according to the operation start signal, the connection code for
transmitting the signal of the acoustic source device is started up. An object of the present
invention is to provide a signal switching device in an acoustic system which is also used as a
signal transmission line and automatically selects an acoustic device on the amplifier side using a
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normal connection cord. Hereinafter, the present invention will be described in detail with
reference to the attached drawings. In FIG. 1, 1 is an acoustic source device comprising a tuner 2,
a player 8 and a tape deck 4, 5 is an amplifier for amplifying the output signals of the tuner 2,
player 3 and tape deck 4, and 6 is a speaker. The non-invention, as will be described later, from
the signal output terminals 2a, 3a and 4a of the tuner 2, the player 8 and the tape deck 4, the
operation start signals of the tuner 2, the player 3 and the tape deck 4, the connection cord 7.8
and 9 to input to the signal input terminals 2b, 3b and 4b of the amplifier 5, respectively. On the
amplifier 5 side, the signal from the signal input terminal to which the operation start signal is
input is selected by the input switching unit 10, The output signal of the sound source device l is
automatically selected in the inside.
In the case of stereo sound systems, the connection cords 7.8 and 9 described above are both
normal cords for connection consisting of one cord for each of the right and left channels and
one cord for grounding. use. Next, a block diagram of one embodiment of the present invention is
shown in FIG. In FIG. 2, reference numeral 11 denotes an output circuit of the speaker 3 as an
audio source device 12; 12u, the output circuit 11 is disconnected from the output terminal 3a of
the player 3 when the player 3 is not operating; Is an output muting circuit for preventing output
to the amplifier 5, and the player 3 has switches 13 ° resistors R1 to R7 for detecting its
operation and non-operation, capacitors cl to c4 and a diode Dt, An operation start signal
generating circuit 14 consisting of D2 is provided. Although the above-mentioned squirt 13 is not
specifically shown, it is a switch which is turned off in conjunction with the tone arm of the
player 8 when the tone arm of the player 8 is separated, and the switch 18 is positive (plus )
Between the terminal 15 to which a voltage of 10 B is applied and the resistor R1, R2 and R3
connected in series between the resistor 15 and the ground and the connection point 16 of R2
and the capacitor C0 whose one end is connected to the ground Connected The connection point
17 between the capacitor C1 and the switch 18 is connected via the capacitor C2 to the anode of
the diode Di and one end of the resistor R5, and the cathode of the diode D1 is connected to the
cathode of another diode D2. The other end of R5 is a control terminal (not shown) of the output
muting circuit 12. Connected to). On the other hand, a resistor R4 is connected between a
connection point 20 of the resistors R2 and R3 and the anode of the diode D2, and resistors R6
and R7 and a connection point 21 between the cathode of the diode D1 and the cathode of the
diode D2. One end of each of the capacitors C4 is connected, and the other end of the resistor R6
is an output terminal (not shown) of the output muting circuit 12 via the capacitor C3. , And the
other ends of the resistor R7 and the capacitor C4 are connected to the ground and the output
terminal 3a of the player 3, respectively. The output terminal 3a and the ground terminal 3e of
the player 3 are connected to the input terminal 8b and the ground terminal 5e of the amplifier 5
by the connection cord 8, respectively. The operation start signal generation circuit 14 having
the same circuit configuration EndPage: 2 configuration as described above is also provided for
the tuner 2 and the earth "de" 4 etc., although not specifically shown. As described in FIG. 1, it is
connected to the input terminals 2b and 4b of the amplifier 5 and the ground terminal 5e.
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The amplifier 5 receives an operation start signal input from the operation start signal generating
circuit 14 of the acoustic earth device 1; and the output signal of the reception circuit 22 selects
an input source to the input source selection switching circuit 24. An input switching unit 10
comprising an input switching drive circuit 23 for performing the above operation and the above
input source selection switching circuit 24 etc., 25 is an equalizer circuit for the player 3 and 26
is the above operation start signal inputted to the amplifier 5 An input muting circuit 27 prevents
generation of a loud shock noise, and an amplifier circuit 27 is configured to have a voltage V
such as a preamplification circuit and a main amplification circuit. The resistors '12 and R14 are
connected between the input terminals 2-b and 4b of the amplifier 5 and the input terminals 32
and 34 of the input source selection switching circuit 24 respectively. A resistor R1B is
connected between the input terminal 3b of the amplifier 5 and the input terminal 33 of the
input source selection switching circuit 24 through an equalizer circuit 25. A tuner 2 is
connected through these resistors R12, R13 and "14". The outputs of the player 3 and the tape
deck 4 are inputted to the input terminals 32. 83 and 84 of the input ground selection switching
circuit 24, respectively. The input source selection switching circuit 24 is composed of, for
example, three CMO 5 analog electronic switches provided corresponding to the tuner 2, the
player 3 and the tape deck 4, and the input terminals 32. 83 and 34 A capacitor, which is
superimposed on the output of the acoustic source device 1 between the ground, and bypasses
bulk noise outside the audio frequency having a very high frequency component input from the
resistors R12, RlB and R14 to the ground. C111 C12 and C13 are connected respectively. Ten
thousand, input start signals are input to input circuit 2 of input switching unit 10 from input
terminal 2b of amplifier 5, equalizer circuit 25 and input terminal 4b through capacitors C21,
C22 and C2g for operation start signal input coupling. doing. The operation start signal of the
sound processing apparatus 1 detected by the receiving circuit 10 is input to the input switching
drive circuit 23 and the input muting circuit 26, and the input switching drive circuit 23 inputs
the input source selection switching circuit 24. The source selection operation is performed, and
the input muting circuit 26 connects the input terminal of the amplification circuit 27 to the
ground during the selection operation of the input ground. The input source 7 selected by the
input source selection switching circuit 24 passes through the entire input muting circuit 26
from the output terminal 35 thereof and is input to the amplification circuit 27 and amplified,
and the output thereof is output terminal 86. G) It is made to drive the speaker 6 by inputting to
the y-peaker 6. Next, the operation of the signal switching device of FIG. 2 will be described.
Among the three analog electronic switches provided in correspondence with the tuner 2, the
player 3 and the tape deck 4, for example, the analog electronic switch corresponding to the tape
deck 4 is turned on. Now, when the tape deck 4 is finished using, and then the tone arm is
released from its support to use the full-sealer 8, the switch 13 is turned off and the abovementioned tone arm is supported by the support capacitor. The charge that has been charged to
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C1 flows into the resistor via the capacitor C2 and the diode D1, the voltage at the connection
point 21 changes, and a positive (one-bus) pulse from the output terminal 8a of the player 8
Output. Note that, to the cathode of the diode D1, a connection created by dividing the voltage of
10 B applied to the terminal 15 by resistors Rt and R2 and R3 and a voltage of W2O are applied
to the resistor through 4 and the diode D2. The diode D1 is off in the steady state in which the
player 3 is operating, and the output signal of the output circuit 11 is prevented from flowing
into the resistor R5 or the capacitor C211111 through the diode Di, and the diode D2 is The
discharge flow of the capacitor CI is prevented from flowing into the terminal 15 side. EndPage:
The pulse (operation start signal) output from the 3 output terminal 8 a is input to the input
terminal 3 b of the amplifier 5 through the signal line of the predetermined right channel or left
channel of the signal code 8. The pulse input to the input terminal 3b of the amplifier 5 is input
from the equalizer circuit 25 to the reception circuit 22 through the entire capacitor C22, but the
reception circuit 22 confirms that the above-mentioned Parnu is the operation start signal of the
player 8 The output is inputted to the input switching drive circuit 23 [7], and the analog
electronic switch corresponding to the player 3 of the input source selection switching circuit 24
is turned on. Therefore, the input terminal 33 and the output terminal 35 of the input source
selection switching circuit 24 are connected, and the output of the full sorter 3 output from the
equalizer circuit 25 is from the input terminal 83 and the output terminal 35 of the input source
selection switching circuit 24. The amplification circuit 27 VC is input through the input muting
circuit 26, and the speaker 6 outputs a voice with the player 3 as input input. Similarly to the
above, when the tuner 2 is operated, the tuner 2 is selected as an input source, and when the
tape deck 4 is operated, the tape deck 4 is selected as an input source.
The input muting circuit 26 shorts the input terminal of the amplification circuit 27 to an arc by
a signal input from the reception circuit 22 during the input source selection operation of the
input source selection switching circuit 24, so The noise generated with the selection operation is
not input to the amplifier circuit 27, and no loud shock noise is generated from the speaker 6 by
the input source selection operation. The input muting circuit 26 can be omitted if the noise
generated with the input source selection operation is small, and it is preferable to provide the
input muting circuit 26 as needed. As described above, when the operation start signal
generating circuit 14 is provided on the sound 4 source device 1 side, the input switching unit
1.0, ':: on the amplifier 5 side can be used to obtain the input mode. It is possible to automatically
select the necessary input mode only by operating one of the sound saw 7 devices 1 without
performing the selection operation. The present invention is not limited to the embodiments
described above, and various configurations can be made within the scope of the present
invention. For example, the operation start signal using the connection cords 7.8 and 9 is
selected by the positive pulse through the signal line of the right channel of the connection cord
8 and the selection of the record player 8, the left of the consecutive cord 7 Switching to the
tuner 2 at the positive pulse through the signal line of the channel only ■ Applying a positive
pulse simultaneously to the signal lines of the left and right channels of the connection cord 9 to
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switch to the tape deck 4 ■ Other, negative Many input source selections can be made by
various combinations, such as using pulses. As apparent from the detailed description above, the
present invention transmits the operation start signal to the amplifier through the connection
cord for transmitting the signal of the sound source device to the amplifier from the operation
start signal generating circuit provided in the sound saw 7 device Since the audio source device
is selected by the operation start signal on the amplifier side, the audio source device can be
automatically selected on the amplifier side using a normal connection code. Moreover, the
connection of the sound system can be made completely the same as the connection of the
conventional sound system, and the automatic connection of the input system can be made
without complicating the connection of the sound system, which has been considered to be
extremely traceable to the user. A selection function can be added.
4. Brief Description of the Drawings The tenth is a block diagram of a signal switching device in
an acoustic system according to the present invention, and FIG. 2 is a circuit diagram of one
embodiment of the present invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1 18: switch 14: operation start signal generation
circuit 22: reception circuit 28: input switching drive circuit 24: input source selection switching
circuit 26: input muting circuit. Patent Assignee Sharp Corporation EndPage: 4
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