JPH07321693A - Transceiver - Google Patents

Abstract

PURPOSE:To eliminate the influence of delay in operation due to a rising of a voice operation circuit in the transceiver provided with the voice operation circuit. CONSTITUTION:When an output voltage from a terminal 1c of the body 1 of the transceiver is lost at a control terminal 11a of the voice operation circuit 11, a timer 13 is started to count a time of 1 to 2sec and an operation signal voltage is applied to the voice operation circuit 11 for the time. Since the voice operation circuit 11 sets the transceiver to a transmission state immediately, a so-called speech head interruption in talking is not caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transceiver used for contacting workers at a construction site, for example.

[0002]

2. Description of the Related Art At a work site, a transceiver is sometimes used for communication between workers who are at remote places or between a worker and a site supervisor. In this case, since the worker uses both hands for the original work, it is desirable to be able to use the transceiver without operating it. From this viewpoint,
The body of the transceiver is fixed to the waist, and a headset with a microphone and a speaker attached to the headband is used. A transceiver provided with a voice operate circuit is used. The voice operate circuit detects a voice input to the microphone and turns on the transmission circuit when there is a voice input. By providing a voice operate circuit, it is possible to communicate to the other party by speaking into the microphone without operating the transceiver.

A transmission / reception switching circuit using a voice operate circuit is disclosed in Japanese Patent Laid-Open No. 4-115630. In this publication, the first column on the right side of page 1
From line 12 to line 12, VOX (Voice Operated
There is an outline of the use of a relay) and an explanation that the conventional circuit showing it is shown in FIG. 2, and the conventional circuit is shown in FIG. By looking at this Figure 2,
It can be seen that the VOX is connected between the microphone and the output plug of this microphone. Then, in accordance with the description in lines 8 to 13 of the upper left column of page 2 of the same publication, the VO
With X, it is possible to know that even if the PTT switch (push-to-talk switch used in the transceiver) is in the off state, if there is an input to the microphone, the receiving state can be switched to the transmitting state.

FIG. 2 shows the structure of a transceiver having a voice operate circuit. To explain this, 1 is the main body of the transceiver, and the antenna 2 and PT
It has a T switch 3, a microphone 4 and a speaker 5. A transmission / reception circuit is incorporated inside the main body 1. When the PTT switch 3 is pressed and the user speaks into the microphone 4, a voice signal is modulated (generally frequency modulated) and radiated from the antenna 2. Has become.

The main body 1 is provided with terminals 1a, 1b, 1c. The terminal 1a is connected to a microphone 4, the terminal 1b is connected to a PTT circuit (not shown), and the terminal 1c is connected to a speaker 5.

[0006] 6 is a headset, a microphone 7
The speaker 8 and the speaker 8 are attached to the headband 9. The microphone 7 is connected to the terminal 1a of the main body 1 and is also connected to the terminal 1b via the microphone amplifier 10 and the voice operation circuit 11. The speaker 8 is connected to the terminal 1c. The voice operate circuit 11 modulates the voice signal from the microphone 7 and radiates it from the antenna when receiving the output signal of the microphone amplifier 10 regardless of the operation state of the PTT switch 3 of the main body 1.

Since the transceiver having the above structure is provided with the voice operate circuit 11, when the worker wearing the headset 6 on the head utters, the microphone 7 catches the voice and the voice signal is output. Is input to the microphone amplifier 10. The voice signal amplified by the microphone amplifier 10 is a voice operation circuit 11
Thus, the PTT switch 3 modulates the modulated signal in the modulation circuit in the main body 1 and radiates it from the antenna 2 regardless of the operating condition.

[0008]

By operating as described above, the worker can keep in touch with other workers who are away while working with both hands. When calling the other party in general use, it is common to say "A" or "Ah" before entering the message without saying the message suddenly. Therefore, a voice enters the microphone 7 and the voice operate circuit 11 Is activated, and a slight time delay until the radio wave is emitted from the antenna 2 does not pose any problem.

However, when an emergency inquiry from the other party is to be answered promptly, the above-mentioned pre-introduction is not carried out and the user suddenly enters into a business. In this case, there is no pre-introduction, and therefore the voice is output to the microphone 7. Upon entering, the voice operate circuit 11 is activated, and a slight time delay occurs until the radio wave is radiated from the antenna 2, which causes a so-called “cutout”, and the first part of the word may not be heard by the other party. obtain. Since the inventions described in the above publications have different problem to be solved, this problem cannot be solved.

The present invention has been made in view of this point, and it is an object of the present invention to provide a transceiver that allows a receiver to completely hear the contents of a transmitted message even if the user suddenly enters into a business without prior introduction. .

[0011]

SUMMARY OF THE INVENTION The present invention provides a transceiver having a voice operate circuit for detecting a voice input to a microphone and turning on a transmission circuit when the voice input is received. , A circuit that turns on the transmission circuit of the transceiver when the reception signal of the transceiver disappears in the reception state and the time from the time when the transceiver turns on, and turns on the transmission circuit when the set time arrives. And a timer for stopping the operation of the circuit.

[0012]

According to the present invention having the above structure, the presence or absence of a received signal is detected, and when the received signal disappears, the transmission circuit is turned on for a predetermined time. Therefore, when an answer from the other party is immediately answered, You will be able to answer during this time. Then, after that, the voice operate circuit that starts to operate enables continuous transmission.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. The voice operation circuit 11 used in this circuit is provided with a control terminal 11a, and when a signal is input to the control terminal 11a, an output signal is generated immediately even if there is no input from the microphone amplifier 10. Circuits are provided. As a specific configuration for this, an OR circuit is provided in the voice operate circuit 11, and the OR circuit processes both the signal from the microphone amplifier 10 side and the signal from the control terminal 11a. Good.

An input side of an amplifier 12 for detecting a speaker output is connected to a circuit connecting the terminal 1c of the main body 1 and the speaker 8 of the headset 6. The output side of the amplifier 12 is connected to the input side of the timer 13. Timer 13
Outputs a signal to the control terminal 11a of the voice operate circuit 11 from the time when the speaker output disappears, and simultaneously starts the time limit and stops the signal after 1 to 2 seconds have elapsed. Therefore, the timer 13 is provided with an inverter circuit or a voltage output circuit. The time limit of the timer 13 is set to 1 to 2 seconds because this is enough to cover the time required for the voice operate circuit 11 to enter the transmission state.

The transceiver thus constructed is
It works as follows. Since the transceiver is provided with a squelch circuit, when there is no signal input from the other side at a constant level, the squelch circuit operates to suppress the noise signal. Therefore, when there is no transmission from the other party, the voltage level at the terminal 1c becomes zero. When the voltage level becomes zero, the timer 13 starts a certain time (1
Control terminal 11a of voice operate circuit 11
The signal voltage is output to. As a result, the voice operate circuit 11 operates regardless of the input from the microphone 7 and puts the transceiver in the transmitting state. Therefore, immediately after the call from the other party is over, even if the worker who receives the call answers instantly, the will can be transmitted without being cut off. It goes without saying that the call can be continued after that.

In a normal contact other than an emergency, when the receiving side worker does not respond to the call from the other side, after the time limit (1 to 2 seconds) of the timer 13 elapses, until the input from the microphone 7. , The transceiver goes into receiving state. The time limit of 1 to 2 seconds of the timer 13 is an example, and the time is not limited to this.

When the transceiver according to the present invention is used, for example, between a worker and a supervisor at a construction site, only the worker uses this transceiver, and the supervisor normally uses PT.
What operates the T switch may be used. Of course, both have no problems using it.

[0018]

Since the present invention is a transceiver configured as described above, it is not affected by a slight delay time until the voice operate circuit operates. Therefore, even in an emergency call, the first part of the message cannot be heard.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a circuit diagram of a conventional one.

[Explanation of symbols]

 1 Main Body 6 Headset 7 Microphone 8 Speaker 10 Microphone Amplifier 11 Voice Operate Circuit 11a Control Terminal 12 Amplifier 13 Timer

Claims (1)

[Claims] 1. A transceiver provided with a voice operate circuit for detecting a voice input to a microphone and turning on a transmitting circuit when the voice input is received, wherein the voice operate circuit receives the transceiver in a receiving state. A circuit that turns on the transmission circuit of the transceiver when the signal disappears, and a timer that measures the time from the time when the signal turns on and stops the operation of the circuit that turns on the transmission circuit when the set time comes A transceiver provided with.