JPH0535497Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a signal switching device equipped with a function switch and a tape monitor switch display device in an audio amplifier or the like.

[Technical background of the invention] FIG. 2 is a circuit diagram of a conventional signal switching device.
In FIG. 2, 1a and 1b are interlocking function switches, each with a fixed terminal 1.
a1 to 1a3, 1b1 to 1b3, movable terminal 1a
0,1b0.

Fixed terminal 1a1 of function switch 1a
-1a3 are connected to input terminals a1-a3, respectively. These input terminals a1 to a3
An input signal is introduced into each.

Movable terminal 1a0 of function switch 1a
is connected to the fixed terminal 2a2 of the tape monitor switch 2a and the tape monitor output terminal 3.

A fixed terminal 2a1 of the tape monitor switch 2a is connected to the tape monitor input terminal 4. A movable terminal 2a0 of this tape monitor switch 2a is connected to an output terminal 5.

On the other hand, the fixed terminals 1b1 to 1b3 of the function switch 1b each have a light emitting element (LED) 6.
~8 is connected to the power supply +B. The movable terminal 1b0 of the function switch 1b is a resistor.
Grounded via R1.

From the power supply +B, the fixed terminal 2b1 of the tape monitor switch 2b is connected via the tape monitor light emitting element 9.
It is connected to the. The fixed terminal 2b2 of the tape monitor switch 2b is in a disconnected state. The movable terminal 2b0 of the tape monitor switch 2b is a resistor.
Grounded via R2.

Next, the operation will be explained.

The movable terminals 1a0 and 1b0 of the function switches 1a and 1b are fixed terminals 1a1 and 1b, respectively.
1, the signal input to the input terminal a1 (for example, a signal from a tuner) is selectively outputted via the fixed terminal 1a1 and the movable terminal 1a0. Then, the light emitting element 6 lights up to indicate that the input signal of the input terminal a1 has been selected.

In this state, the tape monitor switches 2a and 2b
For example, when the movable terminals 2a0 and 2b0 are switched and connected to the fixed terminals 2a2 and 2b2, respectively, the input signal introduced to the input terminal a1 is outputted from the output terminal 5 via the function switch 1a and the tape monitor switch 2a, The speaker connected to the output terminal 5 is driven.

At this time, since the movable terminal 2b0 of the tape monitor switch 2b has been switched to the fixed terminal 2b2 side, the light emitting element 9 does not emit light, indicating that tape monitoring is not in progress.

Movable terminal 2 of tape monitor switch 2a, 2b
When a0 and 2b0 are switched to the fixed terminals 2a1 and 2b1, a tape monitor signal is sent from the tape monitor input terminal 4 to the output terminal 5 via the tape monitor switch 2a, the speaker is driven by the tape monitor signal, and the tape monitor can be done.

At this time, a current flows from the power supply +B to the ground via the light emitting element 9, the tape monitor switch 2b, and the resistor R2, and the light emitting element 9 emits light. This indicates that tape monitoring is in progress.

In this manner, when there is a function switching section having a plurality of inputs and a tape monitor input switching section like an audio amplifier, priority is given to the monitor input switching section as the input source.

Here, when no tape monitor signal is input to the tape monitor input terminal 4 and the tape monitor input switching section is on, that is, each movable terminal 2a of the tape monitor switches 2a and 2b
0 and 2b0 are switched to the fixed terminals 2a1 and 2b1, no matter how many times the function input switching section, that is, the function switches 1a and 1b are switched, the tape monitor switches 2a and 2
Since the fixed terminals 2a2 and 2b2 of the terminal b are open, no input signal is transmitted to the output terminal 5, and no sound is output from the speaker connected to the output terminal 5.

[Problem to be solved by the invention] In this way, in a state where no tape monitor signal is input to the tape monitor input terminal 4, each movable terminal 2a of the tape monitor switches 2a, 2b
0, 2b0 are switched to the fixed terminals 2a1, 2b1 side and turned on, no matter how many times the function switches 1a, 1b are switched without noticing,
Since no input signal is supplied to the output terminal 5, the user wonders that there is no sound and turns off the tape monitor switches 2a and 2b (fixed terminal 2
switching the movable terminals 2a0 and 2b0 to the a2 and 2b2 sides), a loud volume may suddenly come out from the speaker.

Furthermore, depending on the volume, the speaker may be damaged.

[Means for Solving the Problems] This invention was made to solve the above problems, and includes a function switch that selects and outputs one of a plurality of input signals by a switching operation; a function display unit that displays the selected input signal in conjunction with the switching operation of the function switch; and a function display unit that is connected in series with the function switch and displays the input signal and tape monitor signal selected by the switching operation. and a tape monitor switch that selects and outputs the tape monitor signal, and the signal switching device drives a speaker with the input signal or the tape monitor signal selected by the tape monitor switch, wherein the function switch selects and outputs the tape monitor signal. a first detection means for detecting that the function switch has been selected; a second detection means for detecting a switching operation of the function switch; The present invention is characterized by comprising a warning circuit that displays a warning that the tape monitor switch is selecting a tape monitor signal.

[Operation] The first detection means detects that the function switch selects the tape monitor signal, and the second detection means detects that the function switch selects the tape monitor signal.
When the detection means detects a switching operation of the function switch, a warning circuit causes the function display section to display a warning that the tape monitor switch has selected the tape monitor signal.

[Example] Hereinafter, an example of the signal switching device of this invention will be described based on the drawings.

FIG. 1 is a circuit diagram of one embodiment. In this Fig. 1, in order to avoid duplicate explanation, the same parts as in Fig. 2 are given the same reference numerals, and the
The explanation will mainly focus on the parts that differ from the diagram.

As is clear from a comparison between FIG. 1 and FIG. 2, in FIG. is the same as in Figure 2, and this first
In the figure, the following parts have been newly added to the circuit configuration of FIG. 2, and these are the parts that are characteristic of this invention.

In other words, AND gate 13 and timer 1 are newly added.
4, a pulse generator 15 and a switch 16 are added.

The switch 16 is on in a normal state when no output is generated from the pulse generator 15.

Note that the light emitting element 9 for tape monitor display and the light emitting elements 6 to 8 for function display are also the same as those shown in FIG.

An input is introduced into the first input terminal of the AND gate 13 as a second detection means in conjunction with the switching operation of the function switches 1a and 1b. At the second input terminal of this AND gate 13,
A tape monitor switch 2a as a first detection means;
An input is introduced in conjunction with the switching operation 2b.

The output of the AND gate 13 is sent to a timer 14. The output of the timer 14 is sent to a pulse generator 15. The switch 16 is turned off by the output of the pulse generator 15.

This switch 16 forms a series circuit with the resistor R1, and this series circuit connects the function switch 1b.
It is connected between the movable terminal 1b0 and ground.

Next, the operation will be explained.

Movable terminal 2 of tape monitor switch 2a, 2b
Switch a0 and 2b0 to fixed terminals 2a1 and 2b1 side, and connect tape monitor input terminal 4 and movable terminal 2a.
0 is in a connected state, that is, in a tape monitor state, an input is introduced to the second input terminal of the AND gate 13 in conjunction with switching of the tape monitor switches 2a and 2b. be done.

At this time, function switches 1a and 1b
When you switch, AND gate 1
An input is introduced into the first input terminal of 3. As a result, the output of the AND gate 13 is sent to the timer 14, and the timer 14 is activated for a predetermined period of time (several seconds).

While this timer 14 is running, pulses from the pulse generator 15 are outputted and applied to the control terminal of the switch 16.
turn on and off. As a result, the light emitting element selected by the function switch 1b, for example the light emitting element 6, flashes on and off.

[Effect] As described above, according to the signal switching device of this invention, when the function switch is switched while the tape monitor switch is in the on state (switched to the tape monitor side), a warning is displayed and the tape monitor Since the switch is displayed to indicate that it is on, the user can tell that the tape monitor switch is on, and the user can switch the function switch to turn the tape monitor switch off (function). This can prevent the switch from switching to the input signal side selected by the switch.

Accordingly, there is no risk that a loud volume will be emitted from the speaker driven by the input signal or tape monitor signal selected by the tape monitor switch, and that the speaker will be damaged due to the generation of this loud volume.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the signal switching device of this invention, and FIG. 2 is a circuit diagram of a conventional signal switching device. 1a, 1b...Function switch, 2
a, 2b...Tape monitor switch, 4...Tape monitor input terminal, 5...Output terminal, 6-9...
Light emitting element, 13...AND gate, 14...timer, 15...pulse generator, 16...switch, a1 to a3...input terminal.

Claims (1)

[Claims for Utility Model Registration] A function switch that selects and outputs one of a plurality of input signals through a switching operation; and a function switch that selects and outputs one of a plurality of input signals through a switching operation; a function display unit that displays a display, and is connected in series with the function switch,
A signal switching device comprising a tape monitor switch that selects and outputs the input signal and tape monitor signal selected by the switching operation, and drives a speaker with the input signal or tape monitor signal selected by the tape monitor switch. In the apparatus, a first detection means for detecting that the function switch selects a tape monitor signal; a second detection means for detecting a switching operation of the function switch; and the first and second detection means for detecting a switching operation of the function switch. A signal switching device comprising: a warning circuit for displaying a warning on the function display section that the tape monitor switch has selected the tape monitor signal based on the detection result of the detection means.