JPH0714151B2 - Transceiver - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a transmission / reception device that performs a transmission operation by detecting a transmission signal.

[Conventional technology]

FIG. 2 is a system diagram showing the configuration of a conventional transmitter / receiver of this type shown in Japanese Examined Patent Publication No. 58-42980, in which 1 is a receiving antenna for receiving target communication and 2 is a receiving signal. A receiver for detection 3, a controller for receiving a detection signal and performing control to shift to a transmission operation, a transmitter 4 and a transmission antenna 5 for transmitting a transmission signal.

Next, the operation will be described. The transmission / reception apparatus repeats transmission and reception operations at a constant cycle, and the target communication signal received by the reception antenna 1 is supplied to the receiver 2 and the presence or absence of the reception signal is detected. If a reception signal is detected in the reception cycle, this detection signal is transmitted to the controller 3, and the controller 3 outputs a transmission command to the transmitter 4 by using this signal as a trigger signal, and the transmitter 4 In the transmission cycle subsequent to the reception cycle, a transmission wave is transmitted to the space through the transmission antenna 5 with a signal having the same frequency as the reception signal.

When no reception signal is detected in the reception cycle, the reception operation is continued in the subsequent transmission cycle and the transmission operation is not performed at this time.

[Problems to be solved by the invention]

The conventional transmitter / receiver is configured as described above, and the transmission operation starts depending on the presence / absence of a signal. Therefore, when a plurality of transmitters / receivers are used at the same time in the same area, transmission and reception may not be repeated and transmission may not be stopped. There were problems such as.

The present invention has been made in order to solve the above problems, and an object of the present invention is to obtain a transmitting / receiving device that enables a plurality of devices to be used in the same area without causing the above-described oscillation phenomenon. To do.

[Means for solving problems]

The transmitting / receiving apparatus according to the present invention comprises receiving means for receiving a received signal, transmitting means for transmitting a transmitted signal having the same frequency as that of the received signal, and a received signal from the same apparatus as this transmitting / receiving apparatus or from the other apparatus. Specific signal addition means for adding a specific signal for distinguishing whether or not the original transmission signal is transmitted, demodulation means for demodulating and detecting the specific signal in the reception signal, the transmission means and the reception means And the control means for controlling the execution or non-execution of the transmission operation depending on the presence or absence of the specific signal in the received signal or the type thereof.

[Action]

In the present invention, a circuit for transmitting the specific signal and a circuit for demodulating and detecting the signal are provided, and the circuit for transmitting the specific signal and the circuit for demodulating and detecting the signal are provided to the other transmitting / receiving device. The received signals are distinguished by detecting the specified signal of the other party on the contrary, so that the simultaneous operation in the same area becomes possible.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
The figure shows a transceiver apparatus according to an embodiment of the present invention. In the figure, 1 is a receiving antenna, 2 is a receiver, 6 is a demodulation circuit for demodulating and detecting a specific signal from a received signal, 3 is a transmitter 4 and a receiver 2. , And the controller that controls the execution or non-execution of the transmission operation depending on the presence or absence of a specific signal in the received signal or the type of the specific signal in the received signal. 7 is added to the original transmission signal. A modulation circuit for generating a specific signal to be transmitted, 4 is a transmitter, and 5 is a transmission antenna. The modulation circuit 7 and the transmitter 4 constitute a specific signal adding means 10.

Next, the operation will be described. The communication wave signal received by the reception antenna 1 is supplied to the receiver 2, the presence or absence of the signal is detected by the receiver 2, and the presence or absence of the specific signal is detected by the demodulation circuit 6, and is transmitted to the controller 3.

The controller 3 determines whether or not the transmission operation is started depending on the presence / absence of a signal and the presence / absence of a specific signal according to a predetermined condition. If the transmission operation is to be started, a transmission command is issued to the modulation circuit 7 to generate a specific signal. The specific signal generated by the modulation circuit 7 is amplified and modulated by the transmitter 4 and transmitted to the space through the transmission antenna 5.

In the above embodiment, the circuit that transmits the specific signal and the circuit that demodulates and detects the signal are used, but any combination of the following may be used as the combination of the modulated signals.

For this purpose, more combinations can be created by adding a signal generator 8 as shown in FIG. 3, and by doing so, the combination of the modulation circuit system and the modulation signal can be selected according to the purpose. Therefore, in addition to the effects of the above embodiment, there is an effect that the device can be made inexpensive.

The signal generator 8 generates a signal designated by the control of the controller 3 and sends it to the modulation circuit 7. The other components are the same as those in FIG.

〔The invention's effect〕

As described above, according to the transmission / reception device of the present invention, the reception means for receiving the reception signal, the transmission means for transmitting the transmission signal having the same frequency as the reception signal, and the reception signal from the same device as the transmission / reception device. Specific signal addition means for adding a specific signal for distinguishing the original transmission signal to the original transmission signal for transmission, and a demodulation means for demodulating and detecting the specific signal in the reception signal, The transmitting means and the receiving means are alternately operated at a constant cycle, and a control means for controlling the non-execution and execution of the transmission operation depending on the presence or absence of the specific signal in the received signal or the type thereof. As a result, when multiple units of this device are used in the same area, it is possible to prevent the occurrence of a so-called oscillation phenomenon that does not repeatedly stop transmission / reception of transmission / reception, and prevents multiple devices from being installed. The effect of simultaneous operation is capable of transmitting and receiving device within the same area can be obtained.

[Brief description of drawings]

FIG. 1 is a system diagram of a transmitter / receiver according to an embodiment of the present invention, FIG. 2 is a diagram showing a conventional transmitter / receiver, and FIG. 3 is a system diagram showing another embodiment of the present invention. In the figure, 1 is a receiving antenna, 2 is a receiver, 3 is a controller, 4 is a transmitter, 5 is a transmitting antenna, 6 is a demodulating circuit, 7 is a modulating circuit, 8 is a signal generator, and 10 is a specific signal adding means. Is. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A receiving means for receiving a received signal, a transmitting means for transmitting a transmitted signal having the same frequency as the received signal, and whether the received signal is from the same device as the present transmitting / receiving device or from another device. Specific signal addition means for adding a specific signal for distinguishing between the original transmission signal and transmitting, a demodulation means for demodulating and detecting the specific signal in the received signal, and the transmission means and the receiving means And the presence of the specific signal in the received signal,
A transmitter / receiver comprising: a control unit that controls the non-execution or execution of the transmission operation depending on the absence or type.