JPS5918770Y2 - selection signal receiving device - Google Patents

Description

[Detailed Description of the Invention] Information can be transmitted by sequentially transmitting, for example, four selection signals each having a certain low frequency in a predetermined order for 200 mS each, and detecting this on the receiving side.

In such a device, the amount of information to be transmitted can be increased by further varying the frequency of carrier waves for transmitting the selection signal.

However, if a plurality of receivers are provided to receive each carrier wave and a selection signal detector is connected to each receiver, the receiving apparatus becomes enormously large.

Furthermore, if the output terminals of multiple receivers are connected in parallel to the input terminal of a set of detectors, the noise transmitted from each receiver will be added to the detector, resulting in a significant drop in the S/N ratio, making it difficult to detect reliably. This will result in unavoidable drawbacks.

Therefore, the present invention provides a receiving apparatus that uses a plurality of receivers and a set of selected signal detectors and can perform detection reliably without reducing the S/N ratio.

The drawing shows the configuration of an embodiment of the present invention, in which a plurality of receivers R1, R2, etc. are connected to a receiving antenna A via a matching circuit M.
・Connect it.

Each of these receivers is adjusted to receive a carrier wave of a predetermined frequency, demodulates the carrier wave, and sends out a selection signal.

This selection signal is, for example, a combination of, for example, four types of signals, each having a predetermined low frequency, in series for 200 mS as described above.

Therefore, by detecting the combination and the frequency of the carrier wave, that is, the receiver, the content of the transmitted information can be known.

The outputs of the above-mentioned receivers R1, R2... are added to gate signal generators H1, R2... consisting of narrow band filters Fl, F2... and timers TI, T2... .

Filters Fl, F2... detect when the first selection signal sent out from the receiver has a predetermined frequency and start timers TI, T2..., which timers select a series of selection signals. Generate a gate signal with a time length of the signal, thus soo mS, and send it to the gate circuit Gr l,
Add to Gr 2... and GS1, GS2...

The gate circuits GSI, GS2, . . . are opened by the gate signal and allow the selection signals demodulated by the receivers R1, R2, .

This selection signal passes through a buffer circuit 01 to a plurality of selection signal detectors Sl.

Join S2...

Each of these detectors is equipped with, for example, three narrow band filters for detecting a signal of a predetermined frequency, and when one of them detects a signal, the signal is added to the next filter. When each of the filters sequentially detects a predetermined signal, the detection signal is sent to the display D.
SI, DS2, etc. operate.

The detection signal passes through the buffer circuit 02 and opens the gate circuits Gr 1 , Gr2 .

Therefore, among these gate circuits, signal generators H1 and R2
. . . The signals are applied to the display device Drl, Dr! ...operate.

In the above-mentioned apparatus, when a selection signal is sent out using the reception frequency of the receiver R2 as a carrier wave, for example, the selection signal is sent out from the receiver.

Further, if the signal frequency detected by the signal generator H2 is fl, when the frequency of the first signal of the selection signal is fl, a gate signal is sent from the generator and the gate circuit G
s2 remains open until the selection signal ends.

Therefore, the selection signal sent from the receiver R2 is transmitted to the detector Sl.
, S2...

The frequencies of the second to fourth signals are f2. f3. f4 and, for example, the detector S1 has the function of detecting this series of signals, a detection signal is sent out from the detector and the display Dsl is operated.

At the same time, the gate circuits Grl, Gr) are also opened, so that the output signal of the signal generator H2 is transmitted to the gate circuit Gr.
2 to operate the display device Dr2.

That is, the display Dr) indicates that the frequency of the carrier wave and the frequency of the first selection signal are f□, and the display DS1 indicates that the frequencies of the second to fourth signals are f2. f3. At f4, it turns out that there is.

Since the carrier wave and the frequency of the series of selection signals are detected in this way, the information content thereof can be known.

In addition, in the above device, the gate signal generators H1, R2,
When applying the output of ... directly to the indicators Drl, Dr2..., one of these indicators is the indicator Dsl, Ds2
. . . and is not related to the basic operation and effect of the present invention.

Therefore, the gate circuits Gr 1 , Gr 2 . . . and the variable circuit 02 can be omitted.

As mentioned above, the device of the present invention includes a plurality of selection signal detectors S.
Since the receivers R1, R2, . . . are shared by a plurality of receivers R1, R2, .

Moreover, since only the output of one receiver that sends out a selection signal is added to the detector, and noise sent out from other receivers is not added, highly reliable detection can be performed.

[Brief explanation of the drawing]

The drawings are diagrams showing the configuration of an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] a plurality of receivers each receiving carrier waves of different frequencies sequentially modulated by a plurality of selection signals and demodulating the selection signal; and a first selection by adding the output signals of each receiver. a plurality of gate signal generators that transmit gate signals during the duration of the plurality of selection signals when the signal is a predetermined signal; and a plurality of gate signal generators that are opened by each of the gate signals and output signals of the corresponding receivers. a plurality of selection signal detectors for detecting a predetermined one of a series of selection signals to which the signals passed through each gate circuit are added; A selection signal receiver comprising a plurality of indicators to which are applied output gate signals of and a plurality of indicators to which output detection signals from each of said selection signal detectors are applied.