SU1413591A1 - Device for extracting correct time signals - Google Patents

Abstract

The invention relates to a pulsed technique and can be used in electronic clocks adjusted by time signals. The aim of the invention is to improve the accuracy of the selection of accurate time signals, which is achieved by reducing their delay in the device. For this, a parallel broadband channel is additionally introduced into the device, which opens for the passage of time signals when they are selected. The drawing shows a narrowband filter 1, an amplitude detector 2, a pulse selector 3 in duration, a pulse selector 4 in frequency, a trigger 5, a pulse counter 6, a block. 7 controls the state of the counter, the amplifier-limiter 8, the key 9, the one-shot 10, the key control unit P, the input 12 and the output 13 bus. Compared with the prototype, the device provides a reduction of at least one order of delay of the front of the corrective impulse, 1C. f-ly, 1 ill. (L

Description

oo sd oe

The invention relates to a pulse technique and can be used in electronic clocks, corrected by accurate time signals.

The aim of the invention is to improve the accuracy of the selection of accurate time signals by reducing their delay in the device.

For this, a parallel broadband channel is introduced into the device, which opens to pass accurate time signals when they are selected.

The drawing shows a block diagram of the device

The device contains a series-connected narrow-band filter 1, an amplitude detector 2, a pulse selector 3 in duration, and a pulse selector 4 in frequency, trigger 5, the output of which is connected to the input of the pulse counter 6 whose output is connected to the first input of control unit 7 no counter, the second input of which C9 is unified with the output of the selector 3 and the installation input of the trigger 5, the first reset input of which is connected to the output of the selector 4, and the second reset input - with the output of the block 7 and the reset input of the counter 6; It contains a series-connected limiting amplifier 8, a key 9, and a one-shot 10 and a key control unit 11, the output of which is connected to the control input of the key 9, and the first and second inputs are connected to the output of the trigger 5 and the overflow output of the counter 6 "Narrowband filter input 1 is connected to the input bus 12 and the input of the amplifier-limiter 8 The output of the one-shot 10 is connected to the output bus 13o

Unit 11 is made as a two-input element. And Selectors 3 and 4, counter 6 and block 7 are identical to the corresponding prototype blocks.

The device works as follows

In the initial state. Switch 9 is open. The parallel channel for the passage of pulses is closed.

The signals from the receiver arrive at the input of the narrowband filter 1, then are detected by an amplitude detector.

2and enter the selectors input

3 and 4

If the duration of the first analyzed pulse lies in the specified

five

0

five

0

five

0

five

0

five

limits, the selector 3 generates a pulse arriving at the input of the installation of the trigger 5, which overturns and remembers the fact of arrival of the pulse, and at the input of the block 7

When the second pulse arrives from the amplitude detector 2, the selector 4, if the pulse period corresponds to a given one, generates a pulse coinciding on the leading edge with the second exact time signal and arrives at the first reset input of the trigger 5, from the output of the trigger 5, the signal is fed to the input of the counter 6, recorded in it 1, and to the input of the block 7 "

The state control unit 7 serves to eliminate the possibility of accumulating false information in the counter 6. When such information is received, the unit 7 zeroes the counter 6 and resets the trigger 5 The selector 3 on a predetermined front of the second pulse overturns the trigger 5 into a single state.

When the third pulse arrives, if the following period corresponds to the specified one, the selector 4 generates a pulse coinciding on the leading edge with the third time signal, which returns the trigger 5 to the initial state, and the second pulse is recorded in the counter 6 All pulses in the device after the narrowband Filter 1 are time delayed relative to the input pulses.

The moment of time corresponding to the end of the fifth pulse, the exact time signals is decrypted in block 11 according to the state of its first and second inputs. In block 11, a pulse is formed that closes the normally open switch 9, thus preparing a parallel channel to pass the front of the sixth correction pulse

The limiting amplifier 8 at the moment of arrival of the sixth corrective pulse generates a square wave from the input radio pulse passing through the key 9 to the single vibrator 10 The single vibrator 10 triggers from the first square wave pulse and generates a correction pulse at the output.

On the leading edge of the sixth signal of the exact time delayed from 1

relative to the input narrowband filter 1, the counter 6 is zeroed out, and the key 9 returns to the initial state.

The use of this device in comparison with the prototype provides a reduction of at least by then - up to 1 delay of the front of the correction pulse.

Claims (1)

Invention Formula 1 o A device that extracts accurate time signals containing a series-connected narrowband filter whose input is connected to an input bus, an amplitude-specific detector, a pulse selector by duration, and a frequency selector selector, a trigger whose output is connected to. the input of the pulse counter, the output of which is connected to the first input of the control unit of the state of the counter, the second input of which is connected to the pulse selector output by duration and the trigger setup input, the first reset input of which is connected to the output of the pulse selector in frequency, and the second reset input to the output of the control unit of the state of the counter and the reset input of the pulse counter differing from the fact that, in order to improve the accuracy of the selection of time signals, it introduced in series the amplifier-limiter, a key and a one-shot, the output of which connected to the output bus, as well as a key control unit, the output of which is connected to the control input of the key, and the first and second inputs to the trigger output and the pulse counter overflow output, respectively, 2, the device according to 1, about tl and - the fact that the key control unit is executed in the form of a two-input element AND,