JPH032996Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a function switching circuit in system audio.

Conventionally, system audio equipment has been known in which the outputs of various devices such as tuners, decks, players, etc. are connected to a single amplifier, and one of these devices is selected by a function switch of the amplifier. ing. Recently, some of these system audio devices have been provided with operation buttons for each of the above-mentioned devices so that the function switch of the above-mentioned amplifier can also be operated. However, in such an audio device, if the user accidentally operates the function switch directly after operating the device and switching the function switch, there is an inconvenience that another device that is not in operation will be selected.

The present invention has been devised to provide a function switching device free from such drawbacks, and will be described in detail below with reference to embodiments.

The figure shows one embodiment of the present invention.

In the figure, start switches 1-1 and 2-1 of each device of tuner 1, deck 2, and player 3 are shown.
and 3-1 start outputs 1-4, 2-4 and 3
-4 are connected to the set terminals of flip-flops 7, 8 and 9 of the control unit 32, respectively, and the start outputs 1-4 are applied to AND circuits 5 and 6 of the control unit 32, and the start outputs 2-4 are connected to the set terminals of flip-flops 7, 8 and 9 of the control unit 32, respectively.
4 is applied to the AND circuits 4 and 6 of the control unit 32, and the start output 3-4 is applied to the AND circuits 4 and 6 of the control unit 32.
added to. The outputs of the AND circuits 4, 5 and 6 are applied to the reset terminals of flip-flops 7, 8 and 9, respectively, and the stop control terminals 1-1 of the tuner 1, deck 2 and player 3.
2, 2-2 and 3-2. Output terminals 1-3 of tuner 1, deck 2 and player 3,
2-3 and 3-3 are the input terminals 22 of the amplifier 34,
The switches 18, 19 and 20 of the function switch 33 of the amplifier 34 are connected via 23 and 24, respectively. The outputs of flip-flops 7, 8 and 9 are respectively connected to AND circuit 1 of amplifier 34.
3, 14 and 15. Amplifier 34,
Function control switch 1 with one end grounded
The other ends of 0, 11 and 12 are AND circuits 13, 1
4 and 15. AUX terminal 21 of amplifier 34 was connected to switch 17 of function switch 33. One end of the function control switch 16 is connected to the AND circuits 4, 5, and 6, and also to the control terminal 25 of the function switch 33, and the other end is grounded. The outputs of AND circuits 13, 14 and 15 are connected to control terminals 26, 27 and 28 of function switch 33, respectively. Switch 17, 18, 19
The outputs of and 20 are amplified by an amplifier 29 and output to an output terminal 30.

The operation of the above configuration will be explained. When the start switch 1-1 of the tuner 1 is pressed now, a negative pulse is generated to set the flip-flop 7 and make its output low level, so that the output of the AND circuit 13 becomes low level. On the other hand, the outputs of AND circuits 5 and 6 become low level due to the negative pulse, so
Flip-flops 8 and 9 are reset and their outputs go high. Therefore, unless function control switch 11 or 12 is pressed, the input terminals of AND circuits 14 and 15 are both at high level, and their outputs are at high level. Here, the function switch 33 is a well-known semiconductor switch circuit that operates as a first circuit four-contact switch.
When any one of the control terminals 25 to 28 becomes low level, only the corresponding one of the switches 17 to 20 remains on. Therefore, in the above case, only the control terminal 26 to which the AND circuit 13 is connected is at a low level, so that the output from the output terminals 1-3 of the tuner 1 is connected to the amplifier 2.
9. Further, when each stop control terminal of each of the devices 1 to 3 is at a high level, each device is brought into a stopped state. Therefore, in this case, since the outputs of AND circuits 5 and 6 are at a high level, deck 2 and player 3 are brought to a halt.

In this way, when you press the desired start switch of each device 1 to 3, the output of that device will be
The signal is amplified and output to the output terminal 30, and other equipment is stopped.

At this point, I accidentally turned the function control switch 1 on.
When any one of 0 to 12 is pressed, the corresponding one of the outputs of AND circuits 13 to 15 becomes low level for a moment, so even if the function switch 33 is switched once, it still remains Since any one of the flip-flop circuits 7 to 9 is at a low level, the system immediately returns to the original state and selects the device that has been listening to the device. When the function control switch 16 is pressed next, the outputs of the AND circuits 4 to 6 become low level, and the flip-flops 7 to 9 are reset and their outputs become high level, so the outputs of the AND circuits 13 to 15 become low level. Since the level becomes high, switches 18 to 20 are all turned off. On the other hand, the function control terminal 25 is set to a low level by the switch 16, and the switch 1 is turned on.
7 is turned on, and the AUX terminal 21 is connected to the amplifier 29.

Furthermore, when the control unit 32 is not used, the AND circuits 13 to 15 are connected to the function control switch 1.
Controlled only by 0-12. Therefore, in this case, the function control switches 10, 11, 1
Function switches 18, 19, 20 and 16 can be activated by pressing any one of 2 and 16.
You can select any one of them.

As described above, according to the present invention, it is possible to select a desired one from among a plurality of devices connected to an amplifier using the operation switch provided on the device, and the function installed on the amplifier can be selected by mistake. Even if you operate the switch, the one that was previously selected by the operation switch among the above devices will be selected again with priority, and if you connect a device that does not have such an operation switch to the amplifier, it will be the same as before. It is possible to obtain excellent effects such as being able to arbitrarily select by using the amplifier's function switch.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of the present invention. 1...Tuner, 2...Deck, 3...Player, 32...Control unit, 34...Amplifier.

Claims (1)

[Scope of utility model registration request] A plurality of devices each having a start switch, a plurality of first external input terminals and at least one second external input terminal respectively corresponding to the plurality of devices, and any one of these external input terminals. an amplifier section having a function switch that selects one of the above and transmits it to the internal amplifier; and a start switch provided outside the amplifier section corresponding to each of the start switches and which is operated most recently among the start switches. a plurality of storage means that correspond to the above continues outputting output; a means provided outside the amplifier section for stopping equipment other than the one whose start switch was operated most recently among the plurality of equipment; and each of the storage means described above. a plurality of first manual switches provided in the amplifier section in correspondence with each of the first manual switches; a plurality of OR means provided in the amplifier section, a second manual switch provided in the amplifier section, a means for stopping each of the devices by the output of the second manual switch, and a plurality of logic means and a second manual switch provided in the amplifier section; 1. A function switching circuit for system audio, comprising means for operating one of the function switches in accordance with the output of the switch.