JPS5984376A - Automatic function changeover device - Google Patents

Abstract

PURPOSE:To change over a function and to restore a record player to the rest position by detecting an operation of another sound machine during playing of a record player. CONSTITUTION:When the driving circuit 6 of a record player 1 is started, a tone arm switch 9 turns on, and the potential of a point (a) becomes L, and input of the second AND circuit 14 becomes H. An H signal is appied to a function switch IC 19 and PHONO is selected, and the state of record playing is realized. A controlling signal is outputted when a reproducing button of a cassette deck 3 is depressed to bring the system to a reproducing state. This controlling signal is applied to a diode 20 and IC 19, and the system becomes a tape selecting state. The potential of a point (b) becomes H, a detecting switch 9 turns off, an AND 11 turns on and an H signal is applied to the driving circuit 6. The tone arm is returned to the rest position by operating a start/stop switch 8. Consequently, unnecessary wear of a stylus and record when not in use can be prevented.

Description

Detailed Description of the Invention [A. Field of Industrial Application] The present invention relates to an automatic function switching device that can automatically switch functions in an audio system equipped with a plurality of audio devices, and particularly relates to an automatic function switching device that can automatically switch functions in an audio system equipped with a plurality of audio devices. This invention relates to an automatic function switching device capable of switching functions and returning a tone arm of a record player to an armrest position when an audio device other than a chord player is completely operated while a 1' player is in the middle of playing.

[Background of the Invention] An audio system in which audio equipment such as a tuner, tape deck, record player, etc. is connected to an amplifier is well known. The amplifier is equipped with a function switch for switching the source, and when selecting the desired source, first switch the function switch to the desired source position, and then He was manipulating the heir of the desired source. However,
Such a conventional device requires two operations, one for the function switching switch and the other for the source operation, which is extremely troublesome.

Therefore, recently, an automatic function switching device has been proposed in which a source can be selected simply by operating the operating successor of a desired source. However, with such an automatic function switching device, if the operation knob of another source is operated while a record is being played, the function will be switched.
Although it is possible to select and drive a desired source, the record player remains in a playing state, resulting in a problem in that unnecessary playing continues.

[C1 Object of the Invention] The present invention provides an automatic system that switches the /action and returns the record brake V to the rest position in response to the operation of other audio equipment during the performance of a record player. The purpose of this paper is to propose a function switching device.

[2. Embodiment] The figure shows an embodiment of the present invention, in which (1) is a record player, (2) is an audio amplifier, (3) is a cassette deck, (4) is a goo-yuna, and (5) is a An auxiliary input source, e.g.
c. CD (compact disc) player, etc.

(6) is a drive circuit that controls the drive mechanism of the record player (1), (7) is a switch for changing the rotation speed of the turntable of the record player (1), and (8) is the start of the record player (1). and a start/stop switch that is operated when the record player (1) is stopped. (9) is a detection switch that detects the position of the tone arm of the record player (1). When the tone arm is in the armrest position, it is fully opened; otherwise, it is fully opened. ing. (lO) is an in/.1-interface, (11) is the first AND circuit, (12
) is connected to the first AND circuit (
The switching i-transistor <14) connected to the output terminal of 11) is a second AND that allows the output of the inverter <10> and the output of the switching transistor (12) to be applied.
The circuits (15) to (18) are function selection switches provided in the acoustic amplifier (2), (19) are function switches "IC" that can be controlled by control signals from each source, and (20) to (22) are Control from the auxiliary input source (5)
In the first to third die to which the signal a is applied, the first
A resistor (23) connected between the input terminal of the circuit (11) and ground
) together form an OR circuit.

Next, the operation of the refusal device will be explained.

When the start/stop 2-inch (8) of the record player (1) is operated, a voltage of +Vcc is fully applied to the drive circuit (6) and the drive mechanism is started. At the same time, the +Vcc voltage is also applied to the - input terminal of the second AND circuit (14). By the way, since the tone arm is at the armrest position and the detection switch (9) is closed at the start of the start operation, the potential at point a is at L level. Therefore, the two outputs of the second AND circuit (14) both become H level, and the second AND circuit (14) is opened, so the H level output of the second AND circuit (14>) is applied to the function switch IC (19). , enters the phono selection state.

When the record player (1) is in the playing state in this way,
When the playback button of the cassette deck (3) is operated, the cassette deck (3) enters the playback state and outputs a control signal. This control signal is applied to the first diode (20) and at the same time is applied to the function switch IC (19), so that the function switch IC (19) enters the tape selection state. Further, by applying a control signal to the first diode (20), the potential at point b becomes H level. At this time, the record player (1) is in the playing state, and since the detection switch (September) is fully open, the inputs of the first AND circuit (11) to which the control signal and detection signal are applied are both high.
level, and the LAND circuit (11) is opened. Therefore,
A switching transistor (12) connected to the output end of the first AND circuit (11) via a resistor (13) becomes conductive, and an H level signal is applied to the drive circuit (6). By applying such an H level signal, the drive circuit (6) starts/
When the stop switch (8) is operated (Currently, the record player (1) is in the playing state, so the state is the same as when the stop operation is performed), the drive mechanism is operated to return, and the tone arm is returned to the armrest position. Similarly, while playing a record, turn on the tuner (4
), the tuner (4) enters the receiving state and outputs a control signal. Such a control signal
The signal is applied to the diode (21) and also to the function switch IC (19), and the function switch IC (19) enters the tuner selection state.

Further, by applying a control signal to the second diode (21), the potential at point b becomes H level. At this time, the record player (1) is in the playing state and the detection switch (
9) is fully open, the inputs of the first AND circuit (11) to which the control signal and the detection signal are applied both become H level, and the first AND circuit (11) opens.

Therefore, the resistor (13) is connected to the output terminal of the LAND circuit (11).
) connected to the switching transistor (12
) becomes conductive, and an H level signal is applied to the drive circuit (6). When the start/stop switch (8) is operated by the application of such an H level signal, the drive circuit 6) starts the playback process (since the record player (1) is currently in the playing state).
~ When the knob is operated), the drive mechanism is returned and the tone arm is returned to the armrest position. Furthermore, when the auxiliary input source (for example, a CD player) (5) is operated while the record is being played, a control signal is applied to the third diode (22) and the function switch IC (19). The function switch IC (19) is set to the auxiliary input source selection state, and the switching transistor (12) is turned on together with 4.
Apply an H level signal to the drive circuit (6). By applying the H level signal to decline, the drive circuit (6) enters the same state as when the start/stop switch (8) is operated (currently, the record player (1) is in the playing state, so when the stomp operation is performed), Return the drive mechanism to return the tone arm to the armrest position. still,
In the embodiment, a case has been described in which a switch is used as a detection circuit for detecting the position of tone A, but other circuit configurations may be used.

[Effects of the Invention] A detection circuit that detects the arm position of a record player detects that the record player is in a playing state, and outputs a control signal when an audio device other than the record player is operated. When the output is finished, the switching circuit is activated to return the tone R to the armrest position, so unnecessary playback needle and record wear can be avoided when not in use (when another source is selected). I can do it.

[Brief explanation of the drawing]

The figure is a circuit diagram showing one embodiment of the present invention. <6)...Drive circuit, (9)...Detection switch, (
11)...First AND circuit, (12)...Switching transistor.

Claims (1)

[Claims] (1) An automatic function switching device in an audio system equipped with a plurality of audio devices, comprising: 1-a detection circuit for detecting the position of a tone arm of a chord player;
a theoretical circuit to which the output of the detection circuit and a control signal output when the audio equipment other than the record player is operated; a switching circuit connected to the output end of the circuit; and an output of the switching circuit. a drive circuit for the record player, the detection circuit detects that the record player is in a playback state, and in response to the output of the theoretical circuit when the n control signals have been outputted; An automatic function switching device characterized in that the drive circuit is driven by driving a switching circuit, thereby returning the tone arm of the record player to an armrest position.