JPH0142077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cassette tape player for playing back cassette tapes, and is capable of operating a receiver such as a radio at a predetermined time. The present invention relates to an audio device suitable for

In the prior art, the operation for switching between the operations of the cassette tape player and the receiver cannot be performed with a simple operation, or alternatively, the operation has a complicated structure for switching the operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an audio device that can switch between a cassette tape player and a receiver with simple operation and structure.

The present invention includes a receiver, and a cassette tape player that detects that a cassette tape is loaded and is in a state where playback or other operations related to the cassette tape are being performed and outputs a signal representing the loaded state. , means for outputting a coincidence signal at a preset time; a power switch for supplying power to the receiver; a flip-flop for alternating stable states in response to manual operation; a logical sum means for outputting a logical sum with one stable output from the flip-flop, and based on the output of the logical sum means and the signal representing the loaded state, the signal representing the loaded state is not output and When an output is generated from the OR means, a signal to turn on the power switch is outputted to supply power supply voltage to the receiver, and when a signal indicating the loading state is outputted, the power switch is turned off. The acoustic device is characterized by comprising a power supply control means that outputs a signal and cuts off the supply of the power supply voltage.

FIG. 1 is a block diagram of one embodiment of the present invention. The cassette tape player 1 outputs a high level signal to the line 2 when a cassette tape cartridge is being loaded. Whether or not a cartridge is loaded can be detected by a known switch that is turned on when the cartridge is loaded in the playback position, and line 2 goes high during loading of the cartridge. When the cassette tape cartridge is being loaded and line 2 is at a high level, playback (a) and other operations related to the cassette tape (b) are being performed. The other operations related to the cassette tape include b1 fast forward, b2
These are rewinding and b3, a pause action called a pause. The player also has a recording function and outputs a high level signal on line 3 during recording of the cassette tape.
The receiver 4 includes a voltage-dependent variable capacitance diode in a high-frequency signal tuning circuit, local oscillation circuit, etc., and selects a reception frequency by changing the capacitance of the variable capacitance diode using a phase lock loop frequency synthesizer or the like. This is a so-called electronically tuned superheterodyne radio that can receive amplitude modulation broadcasts and frequency modulation broadcasts. The audio signal from the cassette tape player 1 and the audio signal from the receiver 4 are amplified by an amplifier 5 and can be heard from a speaker 6. The power from the DC power source 7 is transferred from the line 40 to the control circuit 9.
The signal is constantly supplied to the control circuit 9 from the switch 8 via the line 27. Power via switch 8 is also provided to receiver 4 via relay switch 11 of relay 10 and relay switch 13 of relay 12. Power from the DC power source 7 is applied to the cassette tape player 1 via a switch 8. When power is supplied to the cassette tape player 1, the cassette tape player 1 is configured to start playing when a cassette tape cartridge is loaded. This switch 8 may be a so-called accessory switch linked to an ignition switch when the audio device of the present invention is mounted on an automobile. The relays 10 and 12 include transistors 14,
15 are connected to each other, and when these transistors 14 and 15 become conductive, the relay 1
0 and 12 are excited, and relay switches 11 and 13
conducts.

A specific electric circuit of the control circuit 9 is shown in FIG. In connection with this control circuit 9, a switch board 16 is provided. This switch board 16
, a time setting switch 17 for operating the receiver 4 at a predetermined time, a control switch 18 for switching the operation of the cassette tape player 1 and the receiver 4, and a control switch 18 for operating the receiver 4 at a predetermined time. Therefore, when a cassette tape is being played back, a reset switch 20 is included which disables the buzzer 19 which sounds when the time when the receiver 4 should receive data has arrived. A time for time adjustment is input to the counter 21 by a time adjustment circuit 23 according to the operation of the switch 17, and the output from the counter 21 is led out to a line 22. A signal representing the current time is always derived from this line 22.
The time for so-called program reservation for operating the receiver 4 at a predetermined time is stored in the random access memory 23 by the time adjustment circuit 23a according to the operation of the switch 17.
The output from this random access memory 23 is
is led out to line 24. A signal representing the reserved time is derived on line 24. Comparison circuit 25
receives the signals from lines 22 and 24, and when the reserved time and the current time match, it outputs a high level signal to line 26 and outputs a high level signal to the flip-flop F.
Set 2.

By making switch 8 conductive, line 2
7 becomes high level, the control circuit 9 is activated by the power from the line 27 and the line 40, and the flip-flop F3 first outputs a low level signal to the line 29. This flip-flop F3 changes the stable state of the output on line 29 from a logic ``1'' to a logic ``0'' or from a logic ``0'' to a logic ``1'' every time an input pulse is applied from the line 30. It has a so-called toggle function that allows it to be changed alternately. When a cassette tape cartridge is not loaded in the cassette tape player 1 and it is not recording, lines 2 and 3 are
is low level. Therefore, the output of NAND gate G2 becomes high level, and flip-flop F1 is set. This flip-flop F
The set output Q of 1 is applied to the other input of AND gate G7.

When the program reservation time arrives, comparator circuit 25 derives a high level signal on line 26 to set flip-flop F2 as described above. The set output Q of this flip-flop F2 is the OR gate G
6 to one input of AND gate G7. In this way, the output of AND gate G7 becomes high level, transistor 15 becomes conductive, and relay switch 13 of relay 12 becomes conductive. Further, the high level output from the NAND gate G2 causes the transistor 14 to conduct, and the relay switch 11 of the relay 10 to conduct. In this way, the receiver 4 is energized and can receive the broadcast at the scheduled program time.

While receiving the broadcast by the receiver 4,
If it is desired to disable the receiver 4, the reset switch 20 is pressed. Due to this
A low level signal is input to NAND gate G8, the output of NAND gate G8 becomes high level, and flip-flop F1 is reset.
Therefore, the set output Q of flip-flop F1 becomes low level, the output of AND gate G7 becomes low level, transistor 15 is cut off, and relay switch 13 is cut off.

When a cassette tape cartridge is not loaded into the cassette tape player 1, line 2 is at a low level, and the output of the NAND gate G2 is accordingly at a high level. In this case, when the program reservation time stored in the random access memory 23 has not yet been reached, the control switch 18 is operated in order to receive the broadcast using the receiver 4. This causes the line 32 to go low, and accordingly the output of the NAND gate G3 goes high, and this high level output is given to the AND gate G4. The output from NAND gate G2 is high, which causes the output of AND gate G4 to provide a high signal on line 30, inverting the stable output of flip-flop F3 and causing the output on line 29 to be high. do. In this way, the high level output of AND gate G5 is OR
It is applied to AND gate G7 via gate G6. The high level output from NAND gate G2 sets flip-flop F1,
Therefore, the high level output from AND gate G7 causes transistor 15 to conduct, and relay switch 13 to conduct. The high level output from NAND gate G2 makes transistor 14 conductive and relay switch 11 conductive. In this way, after turning on the switch 8, when no cassette tape cartridge is loaded into the cassette tape player 1, by operating the control switch 18, the receiver 4 can receive broadcasts. .

When a cassette tape is loaded into the cassette tape player 1, the output of the line 2 becomes high level.
When recording is not performed, line 3 is at a low level, so the signal is
A high level signal is given to NAND gate G2. The output from NAND gate G2 thus goes low, cutting off transistor 14 and leaving receiver 4 disabled. In this way, the cassette tape player 1 can perform a playback operation.

Assume that a program reservation time arrives while a cassette tape cartridge is being loaded into the cassette tape player 1 and being played back.
As a result, a high level signal is applied from the comparison circuit 25 to the line 26, and the flip-flop F
2 is set. The set output Q is applied to AND gate G10. The low level output of NAND gate G2 is inverted by inverting circuit N2 and input to AND gate G10. The high level signal from AND gate G10 activates monostable circuit F4. This monostable circuit F4 outputs a high level signal to the output line 31 for a predetermined time period from the time when the output of the AND gate G10 rises to a high level only when the signal from the line 28 is at a low level. Leave as derived. When monostable circuit F4 is delivering a high level signal to output line 31, line 28 going high forces output line 31 to low level within the time limit of monostable circuit F4. AND gate G11 has an oscillator OSC
An audio frequency signal is given from

At present, the reset switch 20 is not pressed, so the output of the NAND gate G8 is at a low level, and the line 28 is at a low level. As a result, the output line 31 of the monostable circuit F4 becomes high level in response to the high level rising signal from the AND gate G10. Therefore
An acoustic warning sound is generated from the buzzer 19 by the audio frequency signal from the oscillator OSC via the AND gate G11. In this way, when a cassette tape cartridge is loaded into the cassette tape player 1 and a program reservation is reached at a time when recording is not in progress, the buzzer 19 will sound for a limited time determined by the monostable circuit F4. In order to stop the buzzer 19 from ringing, the reset switch 20 can be pressed. Due to this
The output of NAND gate G8 becomes high level,
The output line 31 of the monostable circuit F4 becomes low level, the output of the AND gate G11 becomes low level, and the buzzer 19 is disabled.

During playback by this cassette tape player 1, line 2 is at high level, line 28 is at high level, and line 3 is at low level, so the output of inverting circuit N1 is at high level. , so the output of the NAND gate G2 is at a low level, so that the transistor 14 is cut off, the relay switch 11 remains cut off, and the receiver 4 remains deenergized. In this way, while the cassette tape is being played back, even when the program reservation time arrives, the receiver 4 does not operate and the playback operation continues.

Even if a cassette tape cartridge is not loaded in the cassette tape player 1, if the receiver 4 is activated and is receiving a broadcast and you want to temporarily stop this reception state, you can press the control switch. All you have to do is press 18. As a result, the output of NAND gate G3 becomes high level, and the output of flip-flop F3 becomes low level. Therefore, the outputs of AND gates G5 and G7 become low level, transistor 15 is cut off, and relay switch 13 is cut off. If it is desired to activate the receiver 4 again, the control switch 18 may be pressed once more. As a result, the signal led out to the output line 29 of the flip-flop F3 becomes high level, and accordingly, the high level output of the AND gate G7 causes the transistor 15 to conduct, and the relay switch 13 to conduct.

In place of the acoustic notification means such as the buzzer 19, visual notification means such as a lamp may be used.

As described above, according to the present invention, the operations of the cassette tape player and receiver can be switched with simple operation and structure.

[Brief explanation of drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention, and FIG. 2 is a specific electrical circuit diagram of the control circuit 9. In FIG. 1...Cassette tape player, 4...Receiver, 7...
DC power supply, 8... switch, 9... control circuit, 16...
Operation switch.

Claims (1)

[Scope of Claims] 1. A receiver, and a cassette tape that detects that a cassette tape is loaded and that playback or other operations related to the cassette tape are being performed and outputs a signal indicating the loaded state. a regenerator; means for outputting a coincidence signal at a preset time; a power switch for supplying power to the receiver; a flip-flop that alternates between stable states in response to manual operation; a logical sum means for outputting a logical sum of the signal and one stable output from the flip-flop; and a logical sum means for outputting a logical sum of the signal and one stable output from the flip-flop; outputting a signal to turn on the power switch to supply power voltage to the receiver when an output is being generated from the logical sum means, and turning on the power switch when the signal indicating the loading state is output. 1. An audio device comprising: power supply control means for outputting a signal to turn off and cutting off the supply of the power supply voltage.