JPS6130822A - Automatic interruption communication equipment - Google Patents

Abstract

PURPOSE:To attain effective talking interruption earlier than other station at emergency by detecting a puase of talking by a squelch output of a reception section, starting immediately a transmission section and transmitting an emergency signal. CONSTITUTION:When a press-to-talk switch is turned on and a caller talks from a microphone 10, a transmission output is obtained through an amplifier 11, a delay circuit 12 with a delay in a delay time t1 through a modulator 13 and a power amplifier 14. When an emergency transmission button 17 is depressed, a control device 18 stores an output of the talking button 17 and when the relinquishment of a demodulated output of other station radio wave reception is detected, an output of a squelch controller 9 activates a signal generator 19, rises a transmission output of the amplifier 14 and transmits an emergency signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic interrupt communication device for a communication device used to effectively make an emergency call in a press talk communication system configured between a base station or a plurality of mobile stations. It is.

Conventional configuration and its problems Figure 1 shows the entire configuration of a conventional communication device used for pre-stitch communication between a base station and a mobile station. 1 is an antenna;
3 to 9 constitute a receiving section, 3 is a high frequency amplification section, 4 is a demodulator, 6 is a squelch (SQ) switch that turns on and off the demodulator output with the output from the squelch (SQ) controller, and 7 is a low frequency An amplifier 8 is a speaker serving as an electroacoustic transducer for receiving calls, and 9 is a squelch controller for determining the entire reception input level from the outputs of the high frequency amplification section 3 and the demodulator 4 to obtain a squelch signal. 1o to 15 constitute a transmitter, and 10
is a microphone, 11 is a microphone output amplifier, 13 is a modulator,
14 is a power amplifier; 15 is pressed during transmission and outputs;
A press-to-talk switch 2 is used to operate the power amplifier 14, and a switch 2 is used to switch the reception input from the antenna 1 and the transmission output to the antenna 1 through transmission and reception.

With the above configuration, when the speaker presses the press-talk switch 16 and speaks using the microphone 10, the transmission output is sent to the other party's station, and when the press-talk switch 16t is released, the receiving section is activated, and the high-frequency amplifying section 3, When the reception input received and demodulated by the demodulator 4 is constant and is equal to or higher than a bell, it is detected by the squelch controller 9, the squelch switch 6 is opened, and the demodulated sound is emitted from the amplifier 7 and the speaker 8.

However, in the above configuration, even if the mobile station wants to make an urgent communication to the base station, there are other problems such as distance, transmission power, etc.
If there is a station whose reception level to the base station becomes stronger due to radio wave propagation conditions, etc., the reception section of the base station ignores it, and the call originating from the station desiring emergency communication has the disadvantage that the purpose cannot be achieved.

Purpose of the Invention The present invention eliminates the drawbacks of the above-mentioned conventional examples. When an emergency call is required, it is possible to reliably make an emergency call even from a communication device that is under disadvantageous conditions in terms of location, transmission power, etc. The object of the present invention is to provide an automatic interrupt communication device that performs automatic interrupt communication.

Structure of the Invention In order to achieve the above object, the present invention provides an emergency call button in the transmitting section, and when the button is pressed, the squelch output of the receiving section detects the cut-off charge of the call and immediately activates the transmitting section. By configuring the system to send an emergency signal, the system recognizes the end of the voice by operating the press talk switch and interrupts the other station more quickly than other stations in normal operation, making it effective for emergency calls. This provides the effect of being able to perform interrupts.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to all the drawings. In Figure 2,
5 is a delay circuit of the receiving section, 12. 16 to 19 are all related to the transmitting section, 12 is a delay circuit, 16 is a recovery delay circuit that delays the signal only when the press talk switch 16 is restored (off), 1. 18 is an emergency call button; 18 is a controller; a memory circuit that stores all the outputs of the emergency call button 17; an AND circuit that ANDs the output of the memory circuit and the output of the squelch controller 9; It is equipped with a timer circuit for output. Reference numeral 19 is a signal generator for generating emergency signals, and includes, for example, a 1KH2 signal oscillator. The same reference numerals as in other FIG. 1 represent the same names.

Next, the motion is divided into normal motion and emergency motion, respectively as shown in Figure 3.
This will be explained with reference to the time chart shown in FIG.

First, in normal times, if you start speaking through the microphone 10 at the same time as the press talk switch 15 is operated, the third
Press talk switch output and microphone output as shown in Figures A and B are obtained. The output of the microphone 10 is delayed by an amplifier 11 and a delay circuit 12 by a delay time t1, and then a modulation input Di is generated and applied to a power amplifier 14 via a modulator 13 to obtain a transmission output C. If the rise time of the power amplifier 14 is selected to be approximately the same as the delay time t1, the beginning of the microphone output B will not be interrupted. When the press talk switch 16 is turned off, the disconnection signal is delayed by the recovery delay circuit 16 for a delay time t5.
The transmission output is turned off after a delay of The fall time of the power amplifier 14 is set to +3'.

On the other hand, the receiving unit of the receiving station that received the transmission obtains a receiving input as E, which is further demodulated by the demodulator 4 and demodulated output F(
5, the speaker output G is output from the speaker 8 via the squelch switch 6 and the amplifier 7 after being delayed by the delay time t2 by the delay circuit 5.

Here, if the delay times t1 and t31 are about the same, the transmission output will be turned off after the microphone stops transmitting, a delay equal to the delay time t1, and no endings will be cut off. Thereafter, a call is similarly made between the two stations using all combinations of the operation of the press talk switch 15 and the transmission of the microphone 1o.

Next, the operation in an emergency will be explained. Total 8 stations (base stations)
Assume that it becomes necessary for station A to send an emergency communication to station B during a call between arbitrary station 0 and station B. At this time, if the A station is located closer to the 0 station or is in a state where it can emit stronger transmission power, there is no problem because the interruption of the A station will control the 0 station. In the opposite case, the interruption of the A station will not be successful. However, in the configuration of FIG. 2, as shown in FIG. 4, station A presses the emergency call button 17 to obtain an emergency call button output of q. At this time, if the incoming reception unit is receiving radio waves from station B as indicated by the reception input of the eOA station, the controller 18 stores all the outputs of the emergency call button 17 and waits for the end of the radio waves from station B. . When the end is detected due to the disappearance of the demodulated output f at the time point in FIG. 4, the output of the squelch controller 9 causes
The signal generator 19 is activated to obtain an emergency signal, the transmission output i'z of the power amplifier 14 is raised, and the emergency signal is sent to the B station. The emission of the emergency signal is turned off after a certain period of time (τ) by the timer operation of the controller. On the other hand, in station 0, even if the receiving power a from station B turns off at point c, the sound ends after a delay time t5 after demodulating the speaker output ch due to the action of the delay circuit 60. Even if the Dulles talk switch 16 is pressed immediately as in A, the transmission output d of station 0 will lag behind the transmission output l of the emergency call of station A, allowing the interruption of station A. Furthermore, A
Since it is common for station 0, which has received an emergency call from station A, to refrain from performing a press talk operation due to the tone 2 from the speaker, the interruption of the emergency call by station A is more reliable. Also,
At station A, if the squelch switch 6 is activated by the emergency signal, the emergency signal sent by the station can be received and can be used for confirmation.

It should be noted that the above configuration can be used for digital communication as well if a digital code is inputted as input to the microphone 10 in addition to general voice. The relationship between the transmitting frequency f and the receiving frequency fR is f, = fR (-wave prestoring) and fT fR
(Two-wave press talk). It is assumed that the power amplifier 14 includes an oscillation source of the transmission frequency, and the demodulator 4 of the received receiving section includes a local oscillator and the like.

As described in detail, according to the present invention, all emergency call buttons are configured to automatically detect a break in a call from another station and automatically send an emergency signal when this button is pressed. Therefore, the emergency call can be made earlier by the delay time due to the delay circuit of the receiver in response to the end of the call, rather than the other station conducting a normal call making a press talk call again at the same time as the end of reception number 4. Therefore, even if the station making the emergency call is in a disadvantageous situation due to distance, transmission power, etc., it has the advantage of having a high success rate in making the emergency call.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional automatic interrupt communication device for a communication device, FIG. 2 is a block diagram showing the configuration of an automatic interrupt communication device for a communication device according to an embodiment of the present invention, and FIG. 2 is a time chart for explaining the normal operation in the configuration of FIG. 2, and FIG. 4 is a time chart for explaining the operation at the time of emergency call. 4... Demodulator, 5... Delay circuit, 8...
...Speaker, 9...Squelch controller,
14...Power amplifier unit, 16...Press talk switch, 17...Emergency call button, 18
...Controller, 19...Signal generator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A delay circuit is provided at a subsequent stage of a demodulator in a receiving section of a communication device for performing press talk communication between a base station and a plurality of mobile stations, and a squelch controller that operates in response to input from the receiving section. , an emergency call button, and a controller that stores operation information of the emergency call button and detects a break in a call between other stations based on the output of the squelch controller and sends an emergency signal. Included communication device.