JP2581171Y2 - Wireless communication equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device capable of simultaneous transmission and reception.

[0002]

2. Description of the Related Art Conventionally, a radio communication speaker capable of simultaneous transmission and reception and a microphone are arranged in the same housing and close to each other, and further audio output can be changed by a volume, but the sensitivity of the microphone is constant. Met.

[0003]

Since the conventional wireless communication device is configured as described above, an earphone or the like is used to perform simultaneous transmission and reception, and the audio output position is spaced apart from the built-in microphone. However, if simultaneous transmission and reception are not performed, howling occurs, and simultaneous transmission and reception cannot be performed.

An object of the present invention is to provide a radio communication device which does not cause howling even in the case of simultaneous transmission and reception.

[0005]

SUMMARY OF THE INVENTION A wireless communication device according to the present invention comprises:
A transmitting circuit for transmitting an output audio signal from a microphone
And a receiving circuit that reproduces the received audio signal into audio using a speaker
And the microphone and speaker in the same housing.
In a wireless communication device provided with the speaker also in the same housing and configured to be capable of simultaneous transmission and reception, an output volume adjustment unit, and a sensitivity adjustment unit for substantially adjusting microphone sensitivity,
Predetermine the output volume from the speaker for simultaneous transmission and reception
And control the output volume control means to the bass volume and microphone
Control means for controlling the sensitivity adjusting means to lower the sensitivity of the lophone to a predetermined low sensitivity .

[0006]

According to the radio communication device of the present invention, the output volume adjusting means controls the control means at the time of simultaneous transmission and reception.
The output volume from the speaker is controlled to a predetermined low volume, and the sensitivity of the microphone is controlled to a predetermined low sensitivity by the sensitivity adjustment unit under the control of the control unit. Therefore, howling is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG.
FIG. 2 is a circuit diagram showing a configuration of an embodiment of the present invention, and FIG. 2 is an external view of an embodiment of the present invention.

In the radio communication device of the present embodiment, the output of the microphone 1 is supplied to the microphone amplifier 2 to increase the radiation, and the output of the microphone amplifier 2 is supplied to the power amplifier 3 to amplify the power. The signal received by the antenna 4 is supplied to the high-frequency amplifier 5 for amplification, and the output of the high-frequency amplifier 5 is supplied to the frequency conversion circuit 6 to be converted into an intermediate frequency signal. The signal is supplied to an intermediate frequency signal amplifier 7 for amplification. The amplified intermediate frequency signal is demodulated and amplified by a demodulator / amplifier 8, and the amplified audio output is supplied to a speaker 10 via an electronic volume 9. It is configured to play,
It is configured to allow simultaneous transmission and reception. Where the microphone amplifier
2. The power amplifier 3 and the power controller 15
And a frequency conversion circuit 6, an intermediate frequency signal amplifier 7 and
The demodulation / amplifier 8 constitutes a receiving circuit and is installed in the housing 11.
Have been killed.

Further, the wireless communication device of the present embodiment receives the output from the key switch group 13 for the operation instruction and the key switch group 13 to change the operation state of the wireless communication device to the operation state based on the instruction by pressing the key switch. A microcomputer 12 for performing control; a microphone sensitivity adjuster 14 comprising a switch for switching the gain of the microphone amplifier 2 under the control of the microcomputer 12; and a power for controlling the output of the power amplifier 3 under the control of the microcomputer 12. Controller 15
, And controls the electronic volume 9 under the control of the microcomputer 12.

When the simultaneous transmission / reception (full duplex) instruction key switch in the key switch group 13 is depressed, the microcomputer 12 sets the attenuation of the electronic volume 9 to a predetermined value in cooperation with the electronic volume and sets the volume. Volume control means for lowering, sensitivity control means for switching the microphone sensitivity adjuster 14 in cooperation with the microphone sensitivity adjuster 14 and substantially lowering the sensitivity of the microphone 1, and power controller 15 in cooperation with the power controller 15 And a transmission output reduction control means for reducing the output of the power amplifier 3 by the above control.

On the other hand, in the housing 11 of the wireless communication device, the microphone 1 and the speaker 10 are arranged as far apart as possible. The housing 11 has a key switch group 13.
And a display device 14 for displaying frequencies and the like.

In this embodiment configured as described above,
When the simultaneous transmission / reception (full duplex) instruction key switch in the key switch group 13 is pressed, the wireless communication device is controlled to the simultaneous transmission / reception state under the control of the microcomputer 12 so that transmission / reception can be performed simultaneously.

At the same time, under the control of the microcomputer 12, the attenuation of the electronic volume 9 is increased, the audio output is reduced to a level at which no howling occurs, and the microphone sensitivity adjuster 14 is switched to change the microphone sensitivity. The gain of the amplifier 2 is reduced to a predetermined value where the howling does not occur due to the decrease in the audio output, and the sensitivity of the microphone 1 is substantially reduced.

Further, the power controller 15 is controlled under the control of the microcomputer 12, so that the output of the power amplifier 3 is reduced to a predetermined value and the transmission output is reduced.

Therefore, howling is eliminated due to a decrease in audio output and a decrease in microphone sensitivity. Here, the reason why the microphone sensitivity is lowered is that if the microphone sensitivity is high, howling occurs even at a low volume. Further, the speaker 10 and the microphone 1
Since the distance is large, a decrease in volume for preventing howling can be reduced.

Further, since continuous use is considered depending on the use state of simultaneous transmission and reception, the housing 11 may be overheated, and the transmission output is reduced to a predetermined value, for example, the economy power mode.

In the above embodiment, since the electronic volume is provided for the volume control, the volume can be controlled by the output of the microcomputer 12 at the time of reception.

[0018]

As described above, according to the present invention, the volume is reduced during simultaneous transmission and reception and the sensitivity of the microphone is reduced, so that howling can be prevented during simultaneous transmission and reception.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an external view of a housing of the wireless communication device according to the embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microphone 9 Electronic volume 10 Speaker 12 Microcomputer 13 Key switch group 14 Microphone sensitivity adjuster 15 Power controller

Claims (1)

(57) [Scope of request for utility model registration] 1. An output audio signal from a microphone is transmitted.
The transmitting circuit and the received audio signal
And a receiving circuit that
In phones and speakers also the same enclosure provided simultaneous transmission and reception can be configured wireless communication device, an output volume control means, and sensitivity adjustment means for substantially adjusting the microphone sensitivity, from the speaker when the simultaneous transmission and reception Output
And characterized by controlling the output volume adjustment means to a predetermined bass weight volume, and a control means for controlling the sensitivity adjusting means at a predetermined less sensitive or <br/> sensitivity of the microphone Wireless communicator.