JPH09294035A - Automatic muting device for acoustic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the device muting automatically a sound volume of an acoustic equipment when the user uses a telephone set while listening to the acoustic equipment. SOLUTION: The device is made up of mainly a telephone set 1 installed in a vehicle body, a car audio equipment 2 incorporated with an antenna and a radio detection circuit to detect a radio wave R when the telephone set 1 is in use, an operation section 3 and a speaker 4 or the like. The radio wave detection circuit detects the radio wave R when the telephone set 1 is in use to discriminate the operating state of the telephone sit 1 momentarily and mutes the sound from the speaker 4 based on the result. Thus, the muting operation of the car audio equipment 2 is omitted in the case of using the telephone set 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic muting device for audio equipment such as in-vehicle audio equipment (car audio), and more particularly to a mobile communication equipment which receives or transmits an incoming call while using the audio equipment. The present invention relates to an automatic muting device for an audio device, which is suitable for use when made.

[0002]

2. Description of the Related Art In recent years, mobile communication devices such as car phones, mobile phones, and personal handyphone systems (PHS) have been rapidly spread, and these communication devices are commonly used in automobiles. It has become so. On the other hand, the spread of car audio is remarkable, and the style of enjoying music such as compact discs (CD) and listening to traffic information is becoming established.

When an incoming call is made to a car telephone while using these car audios, the notification sound (for example, a beep sound) is difficult to hear. Further, when trying to make a mobile phone call, it is necessary to operate the operation unit of the car audio to reduce the output volume. Such an operation has a drawback that it imposes a burden on a user who is driving a vehicle and sometimes hinders safe driving.

In order to eliminate such a drawback, as disclosed in Japanese Utility Model Laid-Open No. 4-55839 "Automatic Muting Device for In-Vehicle Audio Equipment", the in-vehicle audio equipment is installed in the in-vehicle audio equipment. When an infrared receiver is installed to control the muting circuit and the car phone is called when the car audio device is operating and the ringer operates, infrared light is emitted from the infrared emitter installed in the handset holder of the car phone. A method is known in which the infrared ray is detected by a light receiving unit and a muting circuit in a vehicle-mounted audio device is operated.

[0005]

However, since the method of the above-mentioned conventional example detects transmission and reception of the telephone by transmitting and receiving infrared rays, there is a problem that the method does not function when there is an obstacle that blocks infrared rays. . Further, since the infrared light emitting portion is provided in the handset holder portion of the automobile telephone, there is a problem that it cannot be applied to mobile communication devices in recent years.

The present invention has been made in view of the above problems, and its object is to automatically mute the volume of an audio device when the user uses the telephone while listening to the audio device. It is an object of the present invention to provide an automatic muting device for audio equipment, which improves convenience for the user.

[0007]

In order to solve the above problems, an automatic muting device for audio equipment according to the present invention comprises:
In an automatic muting device for audio equipment used near the reach of radio waves from mobile communication devices (telephones), radio wave detection means for detecting incoming or outgoing radio waves from mobile communication equipment and this radio wave detection means , A volume control means for detecting the usage state of the mobile communication device, automatically muting the sound of the audio device when the mobile communication device is used, and automatically unmuting the audio device when not in use. Be prepared and configured.

According to the automatic muting device for audio equipment of the present invention, the radio wave detecting means for detecting an incoming or outgoing radio wave of the mobile communication equipment, and the use state of the mobile communication equipment is detected by the radio wave detecting means. , The mobile communication device is used because the sound control device automatically mutes the sound of the audio device when the mobile communication device is in use, and automatically cancels the mute of the audio device when not in use. The muting operation of the audio device can be omitted. In particular, when a mobile phone or car phone is used in a vehicle, it is not necessary for the driver to operate the audio device, which can contribute to safe driving.

Further, in the automatic muting device for audio equipment of the present invention, since radio waves are used as the detection medium of the radio wave detection means, operations other than the audio mute operation of the above-mentioned audio equipment, such as in-vehicle audio equipment, are performed. It can also be used for controlling the turning on / off of power of AV equipment including a connected car navigation or television receiver.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

First, an example of an automatic muting device for audio equipment according to the present invention will be described with reference to FIG. FIG. 1 is a conceptual diagram showing an automatic muting device for audio equipment according to the present invention. Note that the following embodiments will be described by taking a car audio as an example of an audio device, but the present invention is not limited to these forms.

The automatic muting device for audio equipment shown in FIG. 1 has, as an example, a telephone 1 installed in a vehicle, an antenna, a radio wave detection circuit for detecting radio waves of the telephone 1 and the like, which will be described later in detail. The main components are a car audio 2, a power switch of the car audio 2, an operation unit 3 for volume selection and the like, a speaker 4 as a sounding means, and the like. Then, the user uses the automatic muting device for the audio equipment of the present invention having such a configuration.

The operation of the automatic muting device for audio equipment according to the present invention having the above-described structure will be described.

When the user is using the automatic muting device for audio equipment according to the present invention and the telephone 1 is notified of an incoming call, or when the user operates the call button or the like of the telephone 1 to make a call. The automatic muting device for audio equipment of the present invention uses the radio wave R of the telephone 1 by the circuit operation described later.
Is detected, the state of use of the telephone 1 is instantly judged, and based on the result, the volume control means (details will be described later) of the audio equipment is operated to mute the sound of the speaker 4.

That is, the basic operation of the automatic muting device for audio equipment of the present invention is as follows. When an incoming call is made to the telephone 1, the audio signal of the audio device is automatically muted. 2. Similarly, when the user operates the telephone 1 to make a call, the audio signal of the audio device is automatically muted. 3. When the use of the telephone 1 is finished, the mute of the audio signal is automatically canceled, and these operations are performed by detecting the radio wave R transmitted from the telephone 1.

However, since the telephone 1 emits a predetermined radio wave even when the user is not in a call, the mute operation is not performed when the transmission of the radio wave is stopped within a preset time. There is. Further, in the automatic muting device for audio equipment of the present invention, since radio waves are used as the detection medium of the radio wave detection means, in addition to operations other than the audio mute operation of the audio equipment described above, the It can also be used for on / off control.

Next, with reference to FIG. 2, the circuit configuration of the automatic muting apparatus for audio equipment of the present invention will be described. 2A and 2B are diagrams showing the configuration of an automatic muting device for audio equipment according to the present invention. FIG. 2A is a block circuit diagram showing an example of processing by an analog system, and FIG. 2B is a block circuit diagram showing an example of processing by a digital system. Is.

The analog type automatic muting device shown in FIG. 2A has an antenna 5 for receiving radio waves from the telephone 1, a radio wave detection circuit 10 for detecting radio waves from the antenna 5 and generating a mute signal, an amplifier circuit ( (Not shown), and is configured by a transistor circuit 6 as volume control means for controlling the volume of the amplifier circuit to be muted or unmuted in accordance with a mute signal output from the radio wave detection circuit 10.

In addition, the digital automatic muting device shown in FIG. 2B has an antenna 5 for receiving radio waves from the telephone 1, a radio wave detection circuit 10 for detecting radio waves from the antenna 5 to generate a miute signal, and a radio wave. Detection circuit 10
The CPU 7 as a sound volume control means for digitally controlling the sound volume of the amplifier circuit by the mute signal, the digital signal processing circuit 8 and the like. The circuit configuration of the present invention is not limited to that described above, and it goes without saying that another configuration having the same function may be used.

The circuit operation of the automatic muting apparatus for audio equipment of the present invention constructed as above will be described.

In FIG. 2A, an antenna 5 receives a radio wave transmitted from a mobile phone / car phone and sends it to a radio wave detection circuit 10 in the next stage. The radio wave detection circuit 10 detects a radio wave from the antenna 5 and detects only the frequency of the telephone 1 to generate a mute signal for muting. Here, the radio wave transmitted by the telephone 1 is a frequency that is continuously transmitted for a certain period of time when the telephone 1 receives or makes a call,
For example, 800MHz band, 1.5GHz to 1.9GH
It is a radio wave in the z band or a calling signal emitted from the antenna of the phone 1 toward the base station when the ringing sound of the phone 1 sounds.

The transistor circuit 6 as the volume control means is
While being connected to an amplifier circuit (not shown), the transistor circuit 6 is turned on in accordance with the mute signal output from the radio wave detection circuit 10 to mute the volume of the amplifier circuit. When the use of the telephone 1 is completed, the transistor circuit 6 is set to the “OFF” state to cancel the volume mute.

In the digital processing of FIG. 2 (b), the antenna 5 receives the above-mentioned radio wave emitted from the mobile phone / car phone and sends it to the radio wave detection circuit 10 in the next stage.
The radio wave detection circuit 10 detects the radio wave, detects only the frequency of the telephone 1, and generates a mute signal (flag). The CPU 7 receives the mute signal from the telephone 1 and controls the digital signal processing circuit 8 by a predetermined control BUS. In the digital signal processing circuit 8, CP
Under the control of U7, DSP (Digital Signal Processo)
r) A circuit (not shown) is controlled to mute the volume of the amplifier circuit or perform an operation to cancel the mute.

With reference to FIG. 3, the detailed configuration of the radio wave detection circuit of the automatic muting apparatus for audio equipment of the present invention will be described. FIG. 3 is a block circuit diagram showing a radio wave detection circuit of an automatic muting device for audio equipment according to the present invention.

The detailed configuration of the radio wave detection circuit 10 of the present invention is as follows.
A bandpass filter (denoted as "B / P / F" in the figure) that limits the band of the input radio wave, a high-frequency amplifier 12 that amplifies the radio wave, a detection wave 13 that performs detection, a buffer 14 that performs a buffer operation, and these. The power supply circuit and the input / output delay circuit 15 for supplying power to the circuit and delaying the input / output circuit.

The operation of the radio wave detection circuit of the present invention having such a configuration will be described with reference to FIG.

Of the radio waves input through the antenna 5 described above, only the radio waves used by the telephone are selected by the bandpass filter 11, amplified by the high frequency amplifier 12, and then converted into a DC voltage by the detection 13. . The converted DC voltage passes through the buffer 14, and the transistor circuit 6 in the case of analog processing in FIG. In the case of digital processing, the DC voltage output from the radio wave detection circuit 10 in FIG.
Under the control of the PU 7, the digital signal processing circuit 8 digitally performs a muting operation.

When the radio wave transmission from the telephone is completed, the signal from the radio wave detection circuit 10 is stopped and the muting operation of the audio equipment is completed. Further, in the automatic muting device of the present invention, the DC voltage output from the radio wave detection circuit 10 is given a predetermined delay by the power supply circuit / input output delay circuit 15 of the radio wave detection circuit 10 and is instantaneously input. Avoids malfunction due to radio waves and momentary interruptions. The power supply circuit / input output delay circuit 15 supplies a predetermined voltage to each unit.

The present invention is not limited to the above embodiment,
Various embodiments can be adopted. For example, the car audio device has been described in the above-mentioned embodiment, but it goes without saying that the present invention can be applied to other AV devices, for example, a home audio device and a voice guidance type car navigation device. Further, the present invention is not limited to the shape and system of the telephone mobile communication device, and can be applied to PHS, transceiver, and other communication devices. Further, it goes without saying that the present invention can be developed in various forms without being limited to the embodiment described above.

[0030]

As described above, according to the automatic muting apparatus for an audio device of the present invention, the radio communication detecting means detects the usage state of the mobile communication device, and when the mobile communication device is in use the audio device is detected. Since the audio is automatically muted and the audio device is automatically unmuted when not in use, it is possible to omit the muting operation of the audio device when using the mobile communication device. In particular, when a mobile phone or a car phone is used in a vehicle, it is possible to eliminate the need for the driver to operate the audio device, which contributes to safe driving.

Further, in the automatic muting device for audio equipment of the present invention, since radio waves are used as the detection medium of the radio wave detecting means, in addition to the audio mute operation of the audio equipment,
It is also useful because it can be used for power control of peripheral devices.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an automatic muting device for audio equipment of the present invention.

2A and 2B are diagrams showing a configuration of an automatic muting device for audio equipment according to the present invention, in which FIG. 2A is a block circuit diagram showing an example of processing by an analog method, and FIG. 2B is a block circuit showing an example of processing by a digital method. It is a figure.

FIG. 3 is a block circuit diagram showing a radio wave detection circuit of an automatic muting device for audio equipment of the present invention.

[Explanation of symbols]

1 ... Telephone, 2 ... Car audio device, 3 ... Operation unit, 4
... speaker, 5 ... antenna, 6 ... transistor circuit, 7
... CPU, 8 ... Digital signal processing circuit, 10 ... Radio wave detection circuit, 11 ... Band pass filter, 12 ... High frequency amplification, 13 ... Detection, 14 ... Buffer, 15 ... Power supply circuit / input output delay circuit

Claims (4)

[Claims] 1. An automatic muting device for audio equipment used near a mobile communication device, comprising: a radio wave detecting means for detecting an incoming or outgoing radio wave of the mobile communication equipment; While detecting the use state of the mobile communication device, automatically mutes the audio of the audio device in the use state of the mobile communication device, and automatically mutes the audio device in the non-use state of the mobile communication device. An automatic muting device for audio equipment, comprising: a sound volume control means for releasing the sound automatically. 2. The automatic muting of the audio device according to claim 1, wherein the incoming or outgoing radio wave of the mobile communication device is a calling signal output to a base station when a ringing sound occurs. apparatus. 3. The incoming or outgoing radio wave of the mobile communication device has a predetermined frequency that is continuously transmitted for a certain period of time when the mobile communication device receives or makes a call. Automatic muting device for audio equipment. 4. The automatic muting device for an audio device according to claim 1, wherein the audio device is an on-vehicle audio device equipped with a sounding unit.