SU1241507A1 - Pulse-position discriminator - Google Patents

Abstract

The invention relates to telecommunications and radio engineering. The purpose of the invention is to improve noise immunity. The device contains a trigger 1, a sawtooth voltage generator (FPG) 2, consisting of an element And 7, a master oscillator 8 and a pulse counter (SI) 9, a storage unit T, a delay unit (BZ) 4, SI 5 and a key 6. If during the analysis at the information input of trigger 1, the number of incoming pulses is more than one, then a signal is generated at the output of the SI 5, which prohibits the output of the key 6 of the signal that permits writing to the storage unit 3. Thus, the value of the phase error converted to GPN 2 in numerical value, it is considered unreliable and in the storage unit 3 it is not entered. The goal is achieved by introducing the KB 4, SI 5 and key 6, which fulfill the function of the signal quality analyzer. 2 hp f-ly, 1 ill. SL C

Description

one

The invention relates to telecommunications and radio engineering and can be used in the circuits of the phase-locked loop of the data transmission systems and the automatic adjustment of the phase-mismatch signal to the meladu by the input pulse sequence and clock oscillation.

The aim of the invention is to improve noise immunity.

The drawing shows a structural electrical circuit of a phase-pulse discriminator.

The pulse-pulse discriminator contains a trigger 15, a generator 2 sawtooth voltage, a storage unit 3, a block 4 delays, a counter 5 pulses, a key 6.

The sawtooth generator 2 contains an AND 7 element, an oscillating generator 8, and a pulse counter 9.

Phase pulse discriminator works as follows,

The trigger information input receives the input pulse sequence (clock sequence). Each pulse of this sequence triggers trigger 1, which is reset by the clock input by the first incoming pulse of the clock sequence,

The pulse duration, generated by trigger 1, corresponds to the phase mismatch, which with the aid of generator 2 of the sawtooth voltage is converted into a numerical value recorded in storage unit 3 when a signal arrives at its Recording input resolution.

The sawtooth generator 2 is made in the form of a counter 9, triggered by pulses of the master oscillator 8 through the element I 7 during 1 time interval set by trigger 1,

 Each time after the evaluation of the phase mismatch by the trigger, the counter 9 is reset on the falling edge of the signal generated by the trigger 1 and delayed in block 4 delays.

With the arrival of the next pulse 1 of the running pulse sequence, the process of estimating the phase mismatch begins anew.

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When a signal arrives at the input Enabled: the recording of the storage unit 3 causes the previous numerical value of the phase mismatch to be erased and the next value of the phase mismatch from the output of the counter 9 is recorded.

In the absence of a signal at the input of the Resolution, the storing storage unit 3 stores the previous measured value of the phase error.

In the proposed phase-impulse discriminator; the minator records the phase mismatch value only after checking a priori information about the input clock sequence, which (for the BVN code) is that before the trigger 1 is set to the clock 0 input state , no impulse should come from the information input,

If, during the analysis time, more than one pulse arrived at the information input of trigger 1, then the output of counter 5 generates a signal that prohibits the appearance at output of key 6 of the signal (recording resolution), i.e. the phase mismatch value at the output of the sawtooth generator 2 is considered unreliable and is not entered into the storage unit 3.

Thus, the introduction of a delay unit 4, a counter 5 and a key 6, constituting the signal quality analyzer, increases the noise immunity of the pulse-type discriminator. I

Claims (3)

1. Phase pulse discriminator, containing: trigger: sequentially connected trigger, sawtooth generator and memory unit, with the trigger information and clock inputs being respectively the information inputs of the pulse pulse discriminator, which, in order to improve the noise immunity serially connected delay block, pulse counter and key 5 are entered, while the information and synchronization inputs of the delay block are connected respectively to the trigger BbixoAy and so The output output of the sawtooth generator 31 The first and second outputs of the delay unit are connected respectively to the setup input of the sawtooth generator and the information input of the key, the output of which is connected to the Recording input of the storage unit, and the information input of the pulse counter is connected to the information input of the trigger, and the outputs of the storage unit are output pulses discriminator. 2. A discriminator according to claim 1, characterized in that the sawtooth generator is designed as a series-connected master oscillator, the element AND 415074 and the pulse counter, the output of the last bit of which is connected to the second input of the element AND, the third input of the element AND and the installation input of the pulse counter are respectively the information and installation inputs of the sawtooth voltage generator, and the outputs of the master oscillator and pulse counter 10 are the clock and signal outputs of the sawtooth generator, respectively. 3. A discriminator in accordance with claim 1, which is based on the fact that the block of holding and memorizing the block is made respectively in the form of a three-bit shift register and a static register.