JPS584288Y2 - Signal sending circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an individual number signal sending circuit in a command radio.

A command station (central station or master station) calls many slave stations all at once, and the called slave stations report the response status of the slave stations to the command station 1 above.
In the case of this transmission, if the wireless channel it owns is one channel, when the slave station above simultaneously activates the transmitter and sends a response signal to the command station, the command side receiver will transmit the same radio frequency to two or more radio stations. Due to interference prevention, the command station cannot accurately identify the response status from each slave station.

Conventionally, in order to improve such problems, slave stations 1 and 2
After receiving the general paging signal (1 in FIG. 1a) from the command station as shown in 2 in FIG. 1d and 3 in FIG. 1f, respectively, different signal transmission times T5. T2... is held for a certain period of time T.

When the transmitter is activated, it simultaneously sends out one wave within the voice band as a response signal (4 in C and 5 in e in Figure 1), and then transmits the next wave from one of the slave stations outside the U. According to method 1 of transmitting a response signal, all slave stations are contacted and transmit one response signal in sequence, while the command station transmits a paging signal at a time T1. F
2...1 When the response signal is received, the slave station 1 and the slave station 2 are identified.

In such a case, if the slave station's individual number sending circuit is composed of a combination of multiple oscillators, the slave station must set one individual number and one response signal sending time separately, and device manufacturing confusion is likely to occur.

An object of the present invention is to provide a signal transmission circuit that eliminates these drawbacks.

The present invention expresses the individual number of the slave station using a tone digital system (binary numbers are expressed as signals in the voice band of Fl and F2, and in this embodiment, Fl corresponds to 1, F2 corresponds to O), and five individual number setters are used. The present invention is characterized in that by setting the individual number of the slave station, the response signal sending time can also be set.

The following is an example of the present invention with drawings 1. Details 1.
I will explain this.

FIG. 2 shows a configuration diagram of the slave station. FIG. 3 is an example of waveforms at each part in FIG. 2.

When the paging signal received by the receiver 11 is detected by the detector 13, the oscillator 14 starts operating.

The oscillation circuit 14 supplies a stable oscillation frequency (FIG. 3A) to the delay circuit 101.

The delay circuit 10 is composed of a coincidence circuit 300, a counting circuit 200, and 100I.

The output of the individual number setting circuit 15 is the individual number signal sending circuit 1.
6 and a matching circuit 300t.

Further, the output of the oscillator 14 is transmitted to the counting circuits 100 and 200I.
When this is connected, the count value of the counting circuit 100 is set depending on the number of Kaneko stations, and when the set count value is reached, the count value of the counting circuit 20 is set.
0 can be returned to its initial value of 1.

2 reverse numbers determined by the individual number setter 15, for example 101
0 (corresponds to F1F2F1F2 in this embodiment).

) and the count value from the counting circuit 2001 match (-T2 after receiving the general paging signal), the matching output from the matching circuit 300 is input to the 11 number signal sending circuit 16I, and the 2 brigadier general number t is sent as a response signal. The corresponding tone signals "1" and "2" are sent out as a response signal as shown in the third diagram.

At this time, the transmitter 12 is also activated and after transmitting the signal for a certain period of time T as shown in FIG. 3E, the operation of the transmitter is stopped.

When the number of slave stations is N, the counting circuit 100 resets the counting circuit 200 to the initial value by 1 after - T5 (NX100) hours after receiving the paging signal, and then resets the slave station again by 1 after Tx time from this time. A response signal can be sent.

In this embodiment, the response signal can be transmitted as many times as the general paging signal from the command station is detected, and the response operation stops when the paging signal stops.

As explained above, the present invention is characterized in that the delay time from receiving the paging signal to transmitting the response signal can be set simply by setting the individual number of the slave station.

[Brief explanation of the drawing]

FIG. 1 shows the time relationship of response signal sending operations. FIG. 2 shows an embodiment of the present invention. FIG. 3 shows waveforms at various parts in FIG. 2. In the figure, 10 is a delay circuit, and 11 is a receiver. 12 is a transmitter, 13 is a detector, and 14 is an oscillation circuit. 15 is an individual number setting circuit, 16 is an individual number signal sending circuit, 100 and 200 are counting circuits, and 300 is a matching circuit.

Claims (1)

[Claims for Utility Model Registration] A plurality of slave stations receive a control signal sent from a master station, and a signal sending circuit 1 transmits the individual number of each slave station as a response signal to the master station. a pulse oscillator that starts when a signal is received; a setting device that sets the individual number;
a delay circuit that counts output pulses of the oscillator and outputs a pulse delayed by a time until the counted output pulse number matches the individual number t set by the setting device; and an output pulse of the delay circuit. and means for transmitting the set individual number for a predetermined period of time.