JPH0623331U - wireless device - Google Patents

Abstract

(57) [Abstract] [Purpose] To allow an operator to monitor an appropriate call volume in a microphone call of an FM wireless radio telephone device. [Structure] The level of a voice signal to be transmitted is detected, and when the call volume is within an appropriate level range, the transmitting LED is blinked, and in the case of over-modulation, the transmitting LED is turned off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an FM wireless telephone device.

[0002]

[Prior art]

 FIG. 2 shows the configuration of the conventional system. The operation of FIG. 2 will be described below. The voice is converted into an electric signal by the microphone 1 and amplified by the voice amplifier 2 and the modulation degree is restricted by the IDC circuit 3 so that it does not exceed the maximum modulation degree. The high frequency is attenuated so that it becomes equal to or less than the occupied frequency bandwidth, modulated by the transmission VOC of 5 and amplified by the drive amplifier of 6 and becomes the predetermined transmission power by the power amplifier of 7 and emitted from the antenna through the directional coupler of 8. It

On the other hand, the output of the directional coupler 8 is rectified by the diode D1 and controlled by the APC circuit 9 so that the transmission power is always constant. The rectified output of the diode D1 is controlled by the transistors Q1 and Q2, and the transmission display LED of D2 is turned on.

[0004]

[Problems to be solved by the device]

 The above-mentioned conventional configuration cannot monitor whether or not the call volume is appropriate. SUMMARY OF THE INVENTION In order to solve these drawbacks, the present invention aims to control the blinking of the transmission display LED when the call volume is within the proper range.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is to input a voice signal to a level detector, detect an appropriate voice signal width, and control the lighting of a transmission display LED by the output of the level detector.

[0006]

[Action]

 The operation of the present invention will be described. The level detector operates when there is an input signal above the set level, and the control output is output. This output controls the transmission display LED to blink and go out.

[0007]

【Example】

 FIG. 1 shows the configuration of the present invention. This operation will be described below. Since 1 to 10 are the same as the conventional method of FIG. During transmission, the high frequency signal is rectified by the diode D1 connected from the directional coupler 8 and the transistor Q1 becomes non-conductive. When the transistor Q1 becomes non-conductive, the transistor Q2 becomes conductive and the LED for transmission display of D2 lights up.

When voice is input from the microphone 1 in such a state, the RV1 is set so that the 11 level detectors operate at the standard modulation level, and the output of the level detector 11 is controlled by the LED for transmission display of D2. Input to the base of the transistor Q2. By setting the output of the level detector 11 to an appropriate value according to the operating state of the LED, the LED for transmission display of D2 remains lit when the call volume is low, and blinks repeatedly when the volume is proper. ， When the volume is high, it turns off.

[0009]

[Effect of device]

 According to the present invention, an appropriate call volume can be easily monitored simply by adding a level detector.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a conventional configuration diagram.

[Explanation of Codes] 1 Microphone 2 Voice amplifier 3 IDC circuit 4 LPF 5 Transmission VCO 6 Drive amplifier 7 Power amplifier 8 Directional coupler 9 APC circuit 10 Power supply voltage 11 Level detector

Claims (2)

[Scope of utility model registration request] 1. A radio device for displaying the volume status of a transmitted voice in a radio telephone device. 2. An FM wireless telephone device is provided with a light emitting element for indicating transmission and a light emitting element for indicating reception and a level detection circuit for detecting the level of a voice signal, and the output of the level detector is connected to the light emitting element to emit light. A wireless device characterized in that an element is turned on or off.