JPS60114099A - Signal selection system - Google Patents

Abstract

PURPOSE:To provide a signal selection system which effectively cope with extension of a signal source by commonly connecting respective control input terminals of the signal source device and concatenately connecting outer signal input terminals to signal output terminals respectively. CONSTITUTION:When an operation switch inside a signal source device C is operated, a relay 16 is turned on and a relay 14 is turned off, a signal source 15 of the device C is impressed on an amplifier 2 via the relays 14 of devices A, B. Under this condition, when an operation switch 17 inside this device D is turned on to select a signal in the device D, on/off conditions of respective relays 14 and 16 of the device C are reversed, the relay 14 of the device D is turned off and the relay 16 is turned on, and a signal output of a the source 15 of the device D is supplied to the amplifier 2. Thus, for extension of a the signal source, it is enough to concatenately connect signal input and output terminals and commonly connect control signal input/output terminals, thereby degree of freedom in the system is remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal selection system, and more particularly to a signal selection system that selects and outputs one of a plurality of signal sources.

FIG. 1 is a diagram showing an example of such a signal selection system. For example, each signal from three signal sources Δ, B, and C is supplied to an amplifier 2 having a selection and amplification function, and the selectively amplified signal is sent to a speaker 7J. These signal sources may be tuners, tape decks, record players, etc. Note that 21 is a selection switch, and 22 is an amplifier circuit.

However, in the conventional system, when selecting the signal output of multiple signal sources A to C, this is done using a switch 21 provided in the common amplifier section 2, so when adding more signal sources, this switch is used. It is necessary to increase the number of points of contact between
Therefore, there is a drawback that the degree of freedom of the system is restricted.

An object of the present invention is to provide a signal selection system that can effectively cope with the addition of signal sources.

The signal selection system of the present invention is a signal selection system that selectively selects and outputs signal outputs of a plurality of signal source devices, and each of the signal source devices has a signal output terminal and an external signal input terminal. , a control input/output terminal, a switching means having a first state in which the signal no. An operation means for setting the switching means in the first state and sending a control signal to the control input/output terminal to reset the switching means to the second state is provided, and each control input/output terminal of the signal source device is commonly connected. Additionally, an external signal input terminal and a signal output terminal are connected in series.

Below, the embodiments of the present invention will be described using FIG. 2.
I will clarify. Although FIG. 2 does not show the circuit configuration of signal source device A, it is assumed that other signal source devices @B, C, etc. have the same configuration.

11 is an external signal input terminal, 12 is a signal output gH113 is a control signal input/output terminal, and the signal input/output terminals 11 and 12 can be short-circuited to a relay 14 (J: for signal use). 12, the signal 15 from signal source A is sent to relay 16.
It is said that it can be derived via . On the other hand, an operation control switch 17 is provided, and when the switch 17 is not operated, the input to the inverter 18 is at a high level due to the pull-up resistor R1, and when the switch 17 is operated, the input to the inverter 18 is at a low level. becomes. The output of this inverter 18 is applied to the base of a transistor Q1 via a resistor R2, and the collector output of this transistor is connected to the control signal input/output terminal 13. Further, this control signal input/output terminal 13 is connected to the bases of transistors 1 to Q2, and the collector output terminal of this transistor Q2 is one of the two NAND gates 19. The output of the switch 17 is applied to other human power. Note that R3 and R4L are bias resistances of the transistor Q2.

The output of this gate 19 is connected to the reset terminal of an FF (flip-flop>20) consisting of a NOR gate, and this FF
The output of switch 17 is applied to the set end of .

The Q output of this FF20 is supplied to the base of a transistor Q3 via a resistor R5, and the relay 16 is controlled to be on/off by this transistor Q3. Also,
The 0 output of FF20 is connected to transistor Q4 via resistor R6.
The relay 14 is turned on by this transistor Q4.

Now, if FF20 is in the reset state and the Q output is at a low level), and the Φ output is at H (a level), then
i~ Ranjisk Q3 is off and transistor Q4 is on, so relay 16 is off and relay 14 is on, and the external signal supplied to external signal input terminal 11 is derived from signal output terminal 12. is in a state of being

At this time, when the operation switch 17 is turned on, the FF 20 is set and its output J is reversed. Therefore, relay 1
4 is off and the relay 16 is on, so that the output signal of the signal source 15 of the signal source device Δ is derived to the signal output terminal 12. Only while the switch 17 is on, the transistor Q1 is turned on and a control signal is output to the control signal input/output terminal 13. At the same time, transistor O2 is turned off, but the output of one Nandt gate remains unchanged. Therefore, FF20 is not inverted.

In this state, when a control signal is applied from the outside to the control signal input/output terminal 13, the transistor Q2 turns off, and the inputs of one Nant gate both become ('', so the gate output becomes L and the FF20 is reset.

As a result, the FF 20 is inverted, the relay 16 is turned off, and the relay 14 is turned on, so that the external signal applied to the external signal input @11 is led out to the signal output terminal 12.

FIG. 3 is a schematic block diagram of a system according to an embodiment of the present invention, and parts equivalent to those in FIG. 1.2 are designated by the same reference numerals. The control signal input/output @13 of each of the plurality of signal source devices A, B, C, D, . . . are all commonly connected. The signal output terminal 12 and external signal input terminal 11 of each device are sequentially connected in cascade to each other.

In this configuration, if the operation switch 17 (see FIG. 2) in the signal source device C is operated as shown in the figure, and the relay 16 is turned on and the relay 14 is turned off, the signal source 15 of this device C is turned on. The signal is applied to the amplifier 2 through the B and A relays 14. In this state, if the operation switch 17 in this device is turned on to select a signal from the signal source device, the on/off state of each relay 14, 16 of device C is reversed, and the relay 14 of the device is turned off. The relay 16 is turned on and the signal output from the signal source 15 of the device is supplied to the amplifier 2.

As described above, according to the present invention, when adding a signal source, it is sufficient to simply connect the signal input/output terminals in cascade and connect the control signal input/output terminals in common, thereby significantly improving the degree of freedom of the system.

In the above example, a simple pulse C is used as the control signal, but code data for identifying each signal source device may be set in advance and this data may be exchanged.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of a conventional signal selection system, FIG. 2 is a circuit diagram of a signal source device according to the present invention, and FIG. 3 is a block diagram of an embodiment of the present invention. Explanation of symbols of main parts A, B, C, D...Signal source device 11...
・External signal input terminal 12...Signal output terminal 13...Control signal input/output terminal 14.16...Relay 15...Signal source 17... ...Operation switch 20...FF Applicant Pioneer Co., Ltd. agent Patent attorney Motohiko Fujimura (1 other person) #/Guchi 2 Figure A Right 3 Figure

Claims (1)

[Claims] A signal selection system that selectively selects and outputs signal outputs of a plurality of signal source devices, wherein each of the signal source devices has a signal output terminal, an external signal input terminal, a control input/output terminal, and a control input/output terminal. a switching means having a first state in which the internal signal source output is sent to the signal ratio terminal and a second state in which the input signal of the external signal input terminal is sent to the signal output terminal; 1 state and sends a control signal to the control input/output terminal to reset the switching means to the second state. A signal selection system characterized in that the external signal input terminal and the signal output terminal are connected in series.