SU1241445A2 - Device for discriminating clock pulses - Google Patents

Description

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The invention relates to a pulse technique and a communication technique and can be used in receiving equipment of digital information, in a synchronization system and gating of a multipath signal rolled up in a matched filter, followed by processing in a digital computer.

The purpose of the device - povopenie noise immunity.

The drawing shows an electrical block diagram of the device. ,

The device for forming a sequence of pulses contains rectifier 1, delay element 2, successively connected driver 3 and element 4, as well as synchronization unit 5, successively connected subtraction unit 6, recirculator 7, second delay element 8 adder 9, second the input of which is connected to the output of the recirculator 7, and the output to the input of the imaging unit 3-, the output of which is the first output of the device, the output of the rectifier 1 being connected to the first inputs of the subtraction unit 6 and the delay element 2, the output of which is The key is connected to the second input of the subtraction unit 6, and the second input is connected to the second inputs of the second delay element 8 and recirculator 7 and to the first input of the synchronization unit 5, the input of which is connected to the output of the AND element 4, the second input of which is connected to the second output of the block 5 synchronization, which is the second output of the device.

Recirculator 7 contains a series-connected adder 10, rectifier 11, delay element 12, first amplifier 13, subtraction unit 14 and second amplifier 15, the output of which is the output of recirculator 7 and connected to the first input of adder 10, whose second input is The first input of the recirculator 7, while the second input of the subtraction unit 14 is connected to the second output of the delay element 12, the second input of which is the second input of the recirculator 7.

The synchronization unit 5 comprises a discriminator 16 connected in series, a controlled pulse generator 17, a divider 18, a trigger 19 and one oscillator 20, the input of which is connected to the input of the discriminator 16, while the second input

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the trigger 19 is the input of the synchronization unit 5, and the outputs of the controlled oscillator 17 of clock, pulses and one-shot 20 are respectively the first and second outputs of the synchronization unit 5, the key 21, the control input of which is connected to the second output of the synchronization unit 5, the input is connected to the output of the rectifier 1, the output is connected to the third input of the adder 9..

The device works as follows.

The information stream of multipath pseudorandom signals passing through a matched filter is fed to the input of the device, i.e. to the input of the rectifier 1. The response to the input action obtained at the output of the circuit of the serially connected rectifier 1, delay element 2, subtraction unit 6, recirculation of the torus 7, second delay element 8, adder 9 and imager 3, is a square-wave pulse, the duration of which does not exceed half the period of the carrier frequency of the input signal, and the position of the fronts reflect the boundaries of time intervals, which comprise the optimal decision points, about the value of the informative parameter input signal.

The first impulse received at the output of the tel 3 body through the element 4 also acts on the input of the synchronization unit 5. As a result, a pulse is formed at its second input, the positions of the fronts of which coincide with the boundaries of the time interval, which includes the output interval of the taper 3, at the output of the matched filter, the entire energy of the information burst focuses on a short time interval. In order to obtain the same energy in such a shorter time interval at the output of the recirculator 7 of one information parcel, for this purpose it is necessary to ensure the accumulation of oscillations. This follows from the operation of the recirculator 7. Therefore, at the time of forming the first pulse at the output of the former 3, the signal-to-noise ratio at the output of the adder 9 is low and the probability of the formation of the second pulse without supplying the predicted signal to its third input

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Lebani, emitted by the output of the recr-subsequent pulse at the output

The sensor 1 with the help of the key 21 is small, the driver 2 and the need for more efficient accumulation of the signal from the key of the switch 21 is reduced. In this way,

by using a recirculator 7, a drive to increase the use of a key 21 speeds up the signal / noise output at the output of clock pulses to the emator 9, which in turn causes the device to call and reduces the likelihood of their loss (failure).

Claims (1)

DEVICE FOR ISSUING TACT PULSES by ed. »1157676 characterized in that, in order to increase noise immunity, a key is inserted into it, the control input of which is connected to the second output of the synchronization unit, the input is connected to the output of the rectifier, and the output is connected to the third input of the adder. SU. „, 1241445> K) * 1241445 2