SU422113A1 - DETECTION DETECTION OF THE RECEIVED SIGNAL - Google Patents

Description

one

The invention relates to the field of telegraph communication and can be used in duplex information in synchronized transmission of discrete information.

Known detectors of the irradiated signal in the annarature of non-transfer of telegraphic signals with frequency division of the detected signal and non-transfer are known, containing a zero-volt filter, rectifier, low-pass filter and output normal element.

The purpose of the invention is the improvement of signaling signal on the loss of the signal for the violation of communication signal in both balanced, and frequency division: 1 is improper and the simplification of the receive and non-transmission filters in the frequency domain is divided.

This is due to the fact that in the first suggestion. The detector of the OL1 is a mutual detuning of the clock frequencies and non-transmission. The detector was introduced with a clock cycle of 10 oscillations | transmission and a separating element and an integrator with a discharge device.

Pa fng. 1 is a block diagram of a preferred detector; FIG. 2 - time diagrams of work.

The detector consists of a non-multiplier / ave. Coal of the 1st clock signal is oscillating n 1 nonredac 1 1nem as an adder “but 2, and the output of which includes filter 2

; P13knh frequencies. The output of the low-pass filter is connected via an isolating capacitor 5 to the input of the discharge unit south of the device, for example, a transistor switch 4, which controls the discharge of the integrator 5. The integrator 5 is connected to the threshold element 6, the output of which is .1 is the detector output.

The detector works as follows. The input of the multiplier / post is the right angle oscillations η from the reiiepaTOpa of the clock frequency of 1 gear to the clock frequency selection circuit of the prpp.ma, which is different for a very small velil-1N 1y L / (fig. 2, a b). L / in generator. X with quartz stabilization

can be received at the expense of a small one at a time detuning receive clock frequencies) i 1 gears 11. and in the generators of other types, for example, on LC- and U C-elements - due to those 1ologic variations. As a result, iepeMoge 1i (fig. 2, n) ia filter output 2. Frequency is formed by the P1 Loop1 1 signal with a frequency of 2 ./ (Fng. 2, d), which y Luts a working transistor switch 4 and 1 doesn’t 1 discharge the integrator 5 (Fig. 2,

 ) as a result, the voltage at the output of the integrator e does not reach the threshold of operation 1 and L / CP of threshold element 6, which is in the 1st state, denoting the normal operation (Fig. 2.g). Iri any kind of 1x x in the communication line from the transmitter's transmitter go to the receiver, where the clock selection circuit allocates the frequency of its transmitter. In equipment with frequency division of directions this occurs due to a small non-transitional attenuation between reception and transmission, and in equipment with balance separation due to the imbalance of the bridge. As a result, at the moment of time tn, rectangular pulses of the same frequency are received at both inputs of the multiplier /. This leads to the fact that at the output of a low frequency filter the voltage is constant, without sawtooth changes. The isolating capacitor 3 releases this constant voltage (Fig. 2, d), with the result that transistor switch 4 is turned off, and the voltage at the output of the integrator 5 at time tc exceeds iLp (Fig. 2, d). The threshold element 6 is triggered and set to a state indicating the loss of the received signal (Fig. 2, g).

Item from Gain

The detector of loss of the received signal of the duplex equipment of the synchronous transfer of discrete information, containing a low-pass filter and an output threshold element, characterized in that, in order to increase the reliability of signaling about the loss of the received signal in case of violations

connection in the equipment with balanced and frequency division of the reception and transmission directions and simplification of the reception and transmission filters in frequency division, to the input of the low-pass filter is connected to the output of the transmit and receive clock multiplier, the output of the low-pass filter through a separating element, a key l integrator connected to the input of the threshold element.

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