JPS5979450A - Timer stand-by device - Google Patents

Abstract

PURPOSE:To reproduce with a timer the tape sounds without using any back-up electric power supply by securing a switch of an input circuit to a tape input as soon as a power supply is applied by the timer and the tape starts its revolution. CONSTITUTION:In a reproduction mode when a timer stand-by switch 4 is connected to a terminal 4b, a switch 26 is changed over in response to the switch 4 to connect a circuit consisting of a resistance 24 and a capacitor 25 to a tape input selection terminal 23b of a switch control circuit 23. Therefore the value of a capacitor 25 is set larger than that of a capacitor 27 so that the voltage Vb having a slower rise than a radio input selection terminal 23a is applied to the terminal 23b when a power supply is applied. As a result, the voltage Vb is lower than the threshold voltage V0 when the voltage Va exceeds the voltage V0 (after T1). Thus the circuit 23 delivers a tape selection signal, and a selection circuit 10 is switched to a tape input.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a timer standby device that can be applied to audio equipment that combines a radio receiver, tape recorder, and amplifier.

2. Description of the Related Art Structures and Problems Therein, input selection circuits that electronically switch signals from a plurality of program sources such as radio receivers and tape recorders using electronic switches have come into widespread use in recent years. The input selection circuit of audio equipment that combines an amplifier with this input selection circuit, a radio receiver, a tape recorder, etc., when the power switch is turned on, reproduces the program source that was open immediately before the power switch was turned off. It was equipped with a backup power source. If you wanted to play back audio recorded on tape with a timer, you would use tape as the amplifier's input selection circuit, set the timer standby switch to ``play'', and operate the timer.In this case, the amplifier's input selection circuit If you do not start the timer operation after making sure to tape the circuit, even if the power is turned on at the predetermined time and the tape starts rotating, you will not be able to hear the tape playback sound from the J speaker unless you set the input selection circuit to tape. There's something wrong.

Purpose of J to emit Misfire 1. ! IJ iJ provides a timer standby device that allows the sound of a tape to be played back on a timer without using the power source for the above-mentioned Banokag, and the power is turned on by the timer and the manual selection circuit switches to tape input at the same time as the tape rotates. The purpose is to

Structure of the Invention The present invention includes a plurality of selection terminals for electronically switching signals from a plurality of program sources such as a radio receiver, tape recorder, record player, etc., one selection terminal having a different level from other selection terminals. An input selection circuit is provided to select a program source corresponding to the program source, and the input selection circuit is connected in parallel to the tape selection switch among the plurality of selection switches connected to the plurality of selection terminals in conjunction with the selection of the playback position of the timer standby switch of the tape recorder. By connecting a capacitor pulled up to the power supply voltage, the level of the tape selection terminal is made different from that of the other terminals, and the audio of the tape can be automatically played back.

DESCRIPTION OF THE EMBODIMENT FIG. 1 shows the configuration of an embodiment of the present invention.
The drive unit 2 includes a motor, a gradation/jar (both not shown), etc. for running a magnetic tape (not shown), switching between a playback circuit and a recording circuit, and the like. The tape recorder is equipped with a drive control circuit 3 for controlling and a timer standby switch 4.
If the switch is set to the recording side terminal 4a, the 1 drive control circuit 3 will change to the recording state only when the power is turned on, and the switch 4 will switch to the recording state.
If it is set to the reproducing side terminal 4b, the drive control circuit 3 changes to the reproducing state only when the power is turned on.

5 is a radio input terminal 6. Tape input terminal7. A selection circuit 1Q that outputs a desired signal among the signals input from the record input terminal 8 or the auxiliary input terminal 9, and a selection circuit 10.
a signal processing circuit 12 that appropriately processes the signal output from the tape recorder 1 and outputs it to a recording terminal (not shown) or a speaker 11; a selection control circuit 13 that controls switching of the selection circuit 10; This is an amplifier equipped with a switching control circuit 14. The selection control circuit 13 has one end connected to the power supply via a pull-up resistor 16 and the other end connected to the ground. There is a tape input selection switch 18 whose other end is connected to ground, a record input selection switch 2Q whose one end is connected to the power supply via a pull-up resistor 19, and whose other end is connected to ground; The auxiliary input selection switch 22 is connected to the power supply through the up resistor 21, and the other end is connected to the anis.
2 is selected and pressed, the selection circuit 1Q is switched and the input corresponding to the pressed switch 16, 18, 20 or 22 is inputted to the signal processing circuit 12. It consists of 23.

In addition, the auxiliary switching control circuit 14 operates in conjunction with the timer standby switch 4 (the playback terminal 4b) to control the tape input, such as the connection point between the pull-up resistor 24 and the capacitor 25 inserted between the power source and the ground. Selection switch 1
8, a resistor 17, and a connection point between the input line to the switching control circuit 23, and a capacitor 27 connected in parallel to the radio input selection switch 16.

FIG. 2 is a potential diagram of each part of the device to explain the operation of FIG. 1. The switching control circuit 23 outputs a selection signal from the corresponding output terminal when one of the input terminals reaches a level equal to or lower than the threshold value Vo. Then, when two or more of the input terminals reach a level below vO, all output terminals are turned off.

In this embodiment configured as described above, first, when the timer standby switch 4 is in the OFF state, when the power is turned on, a voltage Va whose rise is delayed from the power supply voltage "DD" is applied to the radio input selection terminal 23a connected to the capacitor 27. The switching control circuit 23 outputs a radio selection signal, and the selection circuit 1° switches to the radio input.Next, in the reproduction state where the timer standby switch 4 is connected to the terminal 4b, the switch 26 The control circuit 23 switches in conjunction with the circuit consisting of 24 resistors and 7 capacitors 26.
is connected to the terminal 23b of 'ii
, : When ili;i is input, tape input selection terminal 23b
If the value of the capacitor 26 is selected to be larger than the value of the capacitor 27 so that a voltage vb which rises more slowly than the radio manual selection terminal 23a is applied to the terminal 23a, the voltage Va
When exceeds the threshold voltage vO (after T1), the voltage LH,
Since gVb is below the threshold voltage 0, the switching control circuit 23 switches the tape selection signal to the output selection circuit 10 to the tape input.

Note that the pull-up resistor 24 is such that when the timer standby switch 4 and the switch 26 are off and the power supply voltage is steady, the selector automatically changes from the other position to the tape position by operating the timer standby switch 4 and the switch 26. This is provided to charge the capacitor 26 with the same voltage as the power supply so that the voltage does not change.

According to the present invention, when the timer standby switch of the tape recorder is in the ``playback'' position, when the power is turned on by the timer operation, the tape rotates and the amplifier input is simultaneously turned on. Since it automatically switches to tape input, you can play the tape audio on a timer even without a backup power source.You can also set the tape on the deck and set the timer to listen to the tape audio at the desired time. If you turn the standby switch to the playback side, even if you listen to an FM broadcast, etc. and operate the timer without changing the selector to tape, when the power is turned on at the specified time, the selector will automatically change to tape and the tape will play. I can hear the sound.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a timer standby device W in an embodiment of the present invention, and FIG. 2 is a voltage waveform diagram of main parts for explaining the operation of FIG. 1. 1... Tape recorder, 4... Timer standby switch 2, 6... Amplifier, 10
...Selection circuit, 13...Selection control circuit,
14...Auxiliary switching control circuit, 16.1B, 20
．． 22... Input selection switch, 2.3...
...Switching control circuit, 26...Switch linked to the timer standby switch. Name of agent: Patent attorney Toshio Nakao and 1 other person31
1

Claims (1)

[Claims] Equipped with multiple selection terminals for electronically switching signals from multiple program sources such as radio receivers, tape recorders, record players, etc., the program source corresponding to one selection terminal having a different level from other selection terminals. A timer standby switch for a tape recorder comprising an input selection circuit to be selected, a plurality of selection switches each having one end connected to a power source and a connection point with the other end of each resistor connected to the selection terminal, and a playback position and a recording position. and a switch that connects a capacitor pulled up to the power supply voltage in parallel to the tape selection switch among the plurality of selection switches, which is linked to the switching of the timer standby switch to the playback position. .