JP2555785Y2 - Automotive audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field This invention relates to an on-vehicle audio device, and more particularly to an on-vehicle audio device having one switch having two functions.

(B) Problems to be Solved by Conventional Techniques / Inventions In a conventional in-vehicle audio device, when a call is received, an audio mute circuit is operated so that reproduced sound is not guided to a speaker.

And to release the mute state of the audio mute circuit
We operated the Tape play key or CD play key.

However, the mute is released in the in-vehicle audio equipment without keys as described above, that is, the tape play mode is set when the tape cassette is inserted, and the tuner mode is changed when the tape cassette is not set. In such a case, there is a problem that the cost is increased, and it is difficult to provide the key on a narrow panel.

This invention has been made in view of the above points,
It is an object of the present invention to provide an in-vehicle acoustic device which has solved the conventional disadvantages.

(C) Means for solving the problem FIG. 1 is a functional block diagram of the present invention.

In an on-vehicle audio device having a control key for operation but not having a play key of a cassette tape recorder or a disc player, an external signal detecting means for detecting an incoming call of a telephone and a detection signal from the external signal detecting means. And a function switching means for switching the control key to a mute release key based on a detection signal from an external signal detection means.

(D) Operation The operation of the present invention will be described with reference to FIG.

According to this invention, normally, the switch can control the second circuit via the function switching means.

When a control signal from an external device is detected in this state, the function switching means is controlled based on the control signal.

At this time, the switch can control the first circuit via the function switching means.

(E) Embodiment An embodiment of a vehicle-mounted audio device according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

In the figure, reference numeral 1 denotes an in-vehicle acoustic device of the present invention (hereinafter, referred to as a device); A circuit, 1b is a second circuit provided in the device 1, 1c is a key for operating a switch for giving an instruction to the audio mute circuit 1a and the second circuit 1b, 1d is a control signal 2a from the telephone 2. 1e is a microcomputer for controlling the audio mute circuit 1a and the circuit 1b based on the detection result of the key 1c and the detection circuit 1d, and 1f is a function of the key 1c. Function switching means provided in the microcomputer 1e for switching.

In the on-vehicle audio device configured as described above, usually,
The key 1c can control the circuit 1b via the function switching means 1f.

In this state, when a call comes in to the telephone 2, the telephone 2 outputs a control signal 2a.

The detection circuit 1d detects the control signal 2a, and when a predetermined time has elapsed, the output signal of the detection circuit 1d controls the function switching means 1f.

In this state, the key 1c is switched to the key for canceling the mute of the audio mute circuit 1a, so that the mute state of the audio mute circuit 1a can be controlled by operating the key 1c.

(F) Effect of the Invention According to the in-vehicle acoustic device of the invention, the configuration is as described above, so that two circuits can be controlled with one switch.

For this reason, it becomes possible to distribute many switch functions to a narrow panel.

Moreover, it has excellent features such as easy implementation because it can be configured at low cost.

[Brief description of the drawings]

1 and 2 show an embodiment of a vehicle-mounted audio device according to the present invention. FIG. 1 is a functional block diagram, and FIG. 2 is a block diagram of hardware. Explanation of main symbols 1: on-board audio equipment 1f: function switching means 2: telephone

Claims (1)

(57) [Scope of request for utility model registration] In an on-vehicle audio device having a control key for operation but not having a play key of a cassette tape recorder or a disc player, an external signal detecting means for detecting an incoming call of a telephone; A mute circuit for muting based on the detection signal of (1), and a function switching unit for switching the control key to a mute release key based on a detection signal from an external signal detection unit.