JPH04345323A - Radio communication system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system in the press talk system.

0002

[Prior Art] In the press talk wireless communication system, transmission is started by pressing the press switch, the audio from the microphone is converted to a radio frequency, and the squelch circuit of the other station's radio equipment activates the audio amplification circuit. When opened, an audio signal is output. In this case, it takes about 50ms to 300m after pressing the press switch to start transmitting and before the other station's squelch circuit opens and audio is output.
s of time is required, which may cause the beginning of the audio to be cut off.

[0003] As a countermeasure against this problem, from an operational point of view, press SW
It took a certain amount of time to operate after pressing the button.

0004

SUMMARY OF THE INVENTION It is an object of the present invention to provide a radio device having a function of preventing the audio output of a partner station from cutting off at the beginning of a press.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention is equipped with a transmitting circuit that generates a lamp display and a signal sound for a certain period of time after pressing the press SW.

[0006]

[Operation] To explain the operation of the present invention, press SW
After pressing , the user checks the display and signal tone indicating that calls are not possible for a certain period of time, and then confirms that the display and signal tone have disappeared before making a call.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following operation will be explained using the block diagram shown in FIG. When press SW11 is pressed, the output of the inverter 10 becomes H.
igh, the power source 12 passes through the power supply circuit 8, power is applied to the modulation circuit 2 and the transmission amplifier circuit 3, and the radio wave is emitted from the ANT 5 through the transmission/reception switching circuit 4.

One pulse of a fixed time width is outputted from the pulse generation circuit 13 by the output of the simultaneous inverter 10, and the pulse is used to display the display circuit 16, and the oscillation circuit 1
The signal tone No. 4 passes through the SW circuit 15 and is applied to the audio amplification input section of the receiving circuit 6, and the signal tone is output from the speaker 7.

It is assumed that the output pulse width of the pulse generating circuit 13 is set to approximately the same time as the time from when the press SW is pressed until the squelch of the other station opens.

[0010] Therefore, during the time from when the press is pressed until the squelch of the other party's station is opened, a lamp display or a signal sound indicating that the call is not possible is generated, and after the display or signal sound stops, the call becomes possible.

[0011]

[Effects of the Invention] As a result, an unspecified number of people can make press talk calls without cutting off the beginning of the press voice.

[Brief explanation of the drawing]

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

[Explanation of symbols]

1. Microphone 7 Speaker 13 Pulse generation circuit

Claims (1)

[Claims] [Claim 1] In a wireless communication system using the press talk method, after a transmission start signal is output, a pulse generation circuit generates a pulse for a certain period of time, and the pulse outputs a display on a display circuit and a signal sound. Wireless communication method.