SU1698972A1 - Pulse-length selector - Google Patents

Abstract

The invention relates to a pulse technique and can be used to isolate a burst of pulses with a predetermined follow-up period in the background of noise and interference, for example, to extract phase signals from a meteorological satellite of the Earth. The aim of the invention is to increase the speed of the device while simplifying it at the same time. The pulse train selector contains an input bus 1, a selection block 2, performed on the NAND element, formers 4 and 5 pulses, a counting unit 6, performed on the pulse counter 7 and a decoder 8, the output bus 9. The goal is achieved by the formation of new functional connections. 3 il.

Description

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Isooritan. ufi-; cc; ::.;: to the pulse technique, m can be used to extract a pack of pulses with a predetermined period following noise and interference, for example, to extract phase signals from a meteorological satellite of the Earth.

Purpose - improving the speed of the selector while its simultaneous simplification.

From FIG. 1 shows a structural electrical circuit diagram of the device; FIGS. 2 and 3 are temporary diagrams explaining the operation of the device,

The selector (Fig. 1) contains an input bus 1, which is connected to the first hoW of the selection unit 2, which contains an AND-NOT element 3, the first stroke of which is connected to the inverse and direct outputs of the first and second drivers 4, respectively. 5 pulses. The first and second outputs of block 2 are connected respectively to the first and second inputs of the counting flea 5, which contains a pulse counter 7, the counting input and the reset input of which are connected respectively to the first and second inputs of block 8, and the outputs are identical to the decoder 8 inputs. , the output of which is connected to the output of block 6, which is connected to the output bus 9 and the third input of block 2, Output elem. - that 3 AND-NOT connected, with the first output of the C-2. & the third input is with a per-input input of 5 liters and 2 kilograms of start inputs of the formers 4 and 5, the reset input of the imaging unit 5 is connected to the second input of block 2, and the inverse output is connected to the second output of block 2.

In FIGS. 2 and 3, digital numerals are labeled time diagrams corresponding to the numbers of the z-l bus element in FIG. 1.

The pulse selector with pulse duration works as follows,

The presence of a signal; /; bus 9 is generated after passing, for example, 11 pulses to the bus 1 of the device. Passing or lagging one of 11 pulses per bus 1 translates the pulse train selector from its initial state through gzad (0.1-0.9) 1, where T is the period of impulses packs. The device does not react to impulses with a higher following frequency,

This is achieved as follows. The first impulse of the pack triggers the formers 4 and 5 (see diagrams in Fig. 2). The shaper 5 is triggered by the falling edge of the input pulse, therefore the first pulse does not pass through to the 3, EAR, C of the element 3. since logical 1 arrives at the second input of element 3 after passing the first pulse. Shaper 5 opens counter 7 with the signal from the inverse output, after which counter 7 is ready for counting (the first pulse is not counted). In the case of a pulse skip in a bundle or its delays, after a time r 33d (0.1-0.9) 7, a reset signal of the counter appears, the device is brought to its initial state, i.e. the driver performs the functions of a selector of maximum duration, after passing 10 pulses without p & 10 pulses with the output of element 3 or

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The decoder 8 generates an impulse for the passage of the packet, which goes to the bus 9 of the rescue and converts the shaper 5 to the initial state at the input of SS.

If pulses with a shorter follow-up period arrive on the bus 1 of the device (see Fig. 3}, the former 4 is constantly restarted and the inverter 4 has its logical inverse output level, the element 3 is locked, and the pulses do not arrive at the counter 7.

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Claims (1)

Her. ·· Catch?: One imputon gts dmttel ??? · ?? .. containing a selection block, the first one of which is connected to the input bus, and • • ststsny? · The second outputs ..... respectively with the first and second inputs of the counting unit. ??: tf · which is connected to the output shield. ·: · -The tststsmi block contains perk l tststsy Pulse shapers, iTCO MM. the start-ups of which are connected with the first departure ·?; ·!?: <, · selection, and the inverse output: y then ^: u; m edr-? and os · watts · i-HiynbCOE and direct M.IM OUTPUT second? Formedoza'toll:? JFL; .YUA - Oesthetically with the first and third tsodami ·? MLEMOITA AND NOT, whose output with • ?, shshon ..? the first output of the selection block, and the counting unit contains a sequentially connected pulse counter and a decoder, the output of which is connected to the output of the counter block, the first and second inputs of which are connected respectively to the counter input and the input of the reset pulse counter, which so that, in order to increase the speed of the selector. while simplifying it at the same time, the output of the counting unit is connected to the second input of the selection block and, accordingly, to the • m reset of the second imager im5v, whose inverse output is connected to the second output of the selection block, a. the -'-ny input of the AND-NOT element is connected to the first input of the selection block.