JPH08195685A - Microphone device for mobile radio equipment - Google Patents

Abstract

PURPOSE: To always ensure the hearing of the transmitted voice signals at the reception side in the proper sound volume and quality by providing a sound pressure controller between a microphone unit and a voice amplifier. CONSTITUTION: A mobile radio equipment microphone device 9 includes a sound pressure controller 8 added to its component and also is connected to the main body of a D/A MCA radio equipment via a connection means such as a wire, etc., to carry out the communication of voices, data, facsimile, etc. The controller 8 can use a comparator that applies a differential amplifier, etc. In this instance, the output signals of the voice signals inputted from a microphone unit 4 are automatically controlled at a fixed sound pressure level by the controller 8 and amplified at a voice amplifier part 5. These amplified signals are sent to the main body of the MCA radio equipment via a radio intermediate frequency part 6 and then transmitted from the radio equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone device for a mobile radio device, for example, a microphone device used for a digital / analog MCA (Multi-Channel Access) radio device which is an on-vehicle mobile radio device.

[0002]

2. Description of the Related Art FIG. 2 shows a schematic block diagram of a mobile radio microphone device used in a conventional digital / analog MCA radio. In the figure, 1 is a CPU, 2 is a CPU1
A key operation unit for giving various instructions to 3; a mode switching press switch; 4 a microphone unit; Is a radio intermediate frequency part for leading to a circuit of the mobile radio device. The mobile radio device microphone device 7 is formed by the above components, and the mobile radio device microphone device 7 is a digital / analog MCA.
It is connected to the main body (not shown) of the wireless device by a connecting means such as a wire, and communication such as voice, data, and facsimile is performed.

The operation of the microphone device for mobile radio equipment is such that when a voice signal is inputted from the microphone unit 4, the output signal is amplified by the voice amplifying section 5, and the digital / analog MCA is passed through the radio intermediate frequency section 6. Although it will be sent to the main body (not shown) of the wireless device, the amplification level of the audio signal is constant, so depending on the sound pressure level of the audio signal input from the microphone unit 4, it may be received. Sometimes the sound condition of was worse.

[0004]

As described above, in the above-described conventional mobile radio microphone device, since the amplification level of the audio signal output from the microphone unit 4 is constant, the sound pressure input to the microphone unit 4 is reduced. If the level is too high, the reception side will have sound cracks, and if it is too low, there will be a problem that it will not be heard. Furthermore, even if such a situation occurs, the transmission side cannot immediately recognize it. It was

The present invention solves such a problem and enables the receiving side to always listen to the transmitted audio signal with an appropriate volume and sound quality regardless of the magnitude of the sound pressure level input to the microphone unit 4. The present invention provides a microphone device for a mobile wireless device.

[0006]

In order to solve the above-mentioned problems, the present invention provides a microphone device for a mobile radio, which comprises at least a microphone unit and a voice amplifying section for amplifying an output signal of the microphone unit. And a sound pressure adjuster for automatically adjusting the output signal level of the microphone unit to a constant level between the sound amplification unit and the sound amplification unit.

[0007]

According to the present invention, since the sound pressure adjuster is provided between the microphone unit and the sound amplification section, the sound of the sound signal to be transmitted is irrespective of the magnitude of the sound pressure level input to the microphone unit. The pressure level is constant,
The receiving side can always hear this with an appropriate volume and sound quality.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mobile radio microphone device according to the present invention will be described below with reference to FIG. In the figure, the same parts as those described in FIG. 2 are designated by the same reference numerals.

In FIG. 1, 1 is a CPU, 2 is a CPU 1.
A key operation unit for giving various instructions to 3; a mode switching press switch; 4 a microphone unit; This is the wireless intermediate frequency part for leading to the circuit of FIG. In this embodiment, a sound pressure adjuster 8 is added to the above components to form a mobile radio microphone device 9. Further, the mobile radio microphone device 9 includes:
Connected to the main body (not shown) of the digital / analog MCA radio by connecting means such as wires,
Communication such as facsimile is performed. The sound pressure adjuster 8
A well-known comparator or the like using a differential amplifier can be used as.

Next, the operation will be described. First, when a voice signal is input from the microphone unit 4, the output signal is automatically adjusted to a constant sound pressure level by the sound pressure adjuster 8 and then amplified by the voice amplifying unit 5, and digitally transmitted via the wireless intermediate frequency unit 6. It is sent to the main body (not shown) of the analog MCA wireless device and transmitted, and the problems such as sound cracking and insufficient sound volume on the receiving side as in the conventional microphone device are solved.

[0011]

As described above, according to the mobile radio microphone device of the present invention, even if the sound pressure level of the audio signal input from the microphone unit is large or small, the output signal thereof has a constant sound pressure level. Since the data is automatically adjusted to be transmitted, the problems such as sound cracking and insufficient volume on the receiving side are solved, and therefore the transmitting side can perform transmission without worrying about the state of the receiving side. .

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an embodiment of a mobile radio microphone device of the present invention.

FIG. 2 is a schematic block diagram showing an example of a conventional microphone device for a mobile wireless device.

[Explanation of symbols]

1 ... CPU, 2 ... Key operation part, 3 ... Press switch, 4 ... Microphone unit, 5 ... Audio amplification part,
6 ... Wireless intermediate frequency section, 7, 9 ... Microphone device for mobile wireless device, 8 ... Sound pressure adjuster.

Claims (1)

[Claims] 1. A microphone device for a mobile wireless device, comprising at least a microphone unit and a voice amplifier for amplifying an output signal thereof, wherein an output signal level of the microphone unit is provided between the microphone unit and the voice amplifier. A microphone device for a mobile radio, which is provided with a sound pressure adjuster for automatically adjusting the sound pressure to a constant level.