SU892690A1 - Pulse discriminator - Google Patents

Description

(54) PULSE SELECTOR

Claims (2)

The invention relates to empowerment technology and miket to be used in information-measuring and computing systems. A pulse selector is known, which contains two pulse generators, two coincidence elements and a delay line 01. The disadvantages of such a selector are the possibility of false alarms, insufficient selection accuracy and noise immunity, as well as very little functionality due to the lack of control coincidence of the edges of measured pulses with clock pulses. Also known selector. impulses containing two impulse drivers, two coincidence elements, a delay pin and a memory trigger and a disjunctor, one of whose inputs is connected to output 4 of the first driver connected via a second element to coincide with another input of the disjunctor whose output through the delay line is connected to one of INPUTS of the memory trigger, the output of which is connected to one of the inputs of the second element of the match, and one slot of the second driver through the first element of the match is connected to the other input of the trigger trigger ani, with one on the input of the first and second output schugoL shaper is connected to one input of disjunctor r21. . The disadvantage of some of the well-known selections software is low resistance; the process of succession associated with the presence of a delay line, as well as the impermeability of ensuring the selection of pulses in duration and phase are not related to & relatively to the saddlers. The purpose of the invention is to enhance the functionality and increase noise immunity. The goal is achieved by introducing a second DIC trigger into the device containing the pulse driver and the first trigger, the first 3 inputs of which are connected to the output of the first t3lC 38 trigger, the second C7 input with the first input of the first OK, trigger and co the second output of the driver, and the output with the secondary R input of the first JK ' trigger and the output bus of the device, the first output of the driver connected to the input of the first trigger, and the combined trigger synchronization inputs are the control input of the device. functional- electrical diagram of the proposed mouth roystva. Pulse selector contains shaper 1, 3K. -triggers 2 and 3, built on the principle of two-step memorization of information. The functional purpose of the inputs 47X-t. trigger 2 is indicated on the drawing by means of the following marks: and - the input for setting the trigger to the state Ij С — the synchronization input; U - OR interconnected first and second inputs for separate installation in the first stage of the trigger. The functional purpose of the inputs JK Trigger 3 is indicated on the drawing by tags; 3 — conjugately connected first and second inputs for setting the trigger to state 1; C - synchronization input. As the output of the 3-trigger 3, the output of the first stage trigger is used. The pulse selector works as follows. In the initial state at the outputs of the triggers, zero signals of clock pulses are fed to the combined trigger synchronization inputs. The selectable pulse arrives at the input of the generator 1, from the outputs of which the pulse corresponding to the leading front enters the D-trigger trigger 2 and the pulse corresponding to the trailing edge is the first input for a separate installation in O of trigger 2 and on the second Eukhod of trigger 3, When the pulse coincides, corresponding to the front edge of the selectable pulse, with a clock pulse, trigger 2 edanichnoe are in state and a single signal is supplied to the first input flip-flop 3 3 When a second clock pulse they trtgger 2 returns to the state starting Noe; If the input pulse is equal in duration to the time interval between clock pulses, then the pulse 0 corresponding to the trailing edge of the selectable pulse arrives at the second 3-input of trigger 3 simultaneously with the second clock pulse at its sync input. In this case, the trigger 3 switches to a single state and a single signal from its output goes to the output of the device. When the next clock pulse arrives, trigger 3 returns to the initial state and a zero signal is set at its output, t, e. pulse selection is completed. If the input pulse is shorter in duration than the time interval between; clock pulses, the pulse corresponding to the rear frunta of the selectable pulse arrives at the first input for separately setting O of trigger 2 and returns it to the initial state. Before the second clock pulse arrives, the zero signal from its input is fed to the first 3 input trigger 3 and prohibits switching of trigger 3 to one state. If the duration of the input pulse is longer than the time interval between clock pulses, then the second clock pulse arrives before the trailing edge of the selectable pulse. There is no signal at the second L input of trigger 3, therefore the second clock pulse does not switch trigger 3 to state 1 and the pulse does not pass to the device output. At the same time, the second clock pulse arrives at the trigger synchronization input of trigger 2 and returns it to the initial state. Thus, o6paaoMj, pulses pass to the output of the device if the moments of change of the input signal (the rising and falling edges of the selectable pulse) coincide in time with the clock pulses, and the duration of the selectable pulse is equal to the period of the clock pulses, e. if the selected pulse is limited in time, two adjacent clock pulses. Information pulses on the input bus or interferences, the fronts of which do not coincide in phase with the clock pulses, are not remembered by the device and do not cause additional aftereffects, but confirm the initial state of the trigger and do not lead to a malfunction or selector failure. Claims of the invention Pulse selector comprising a pulse former and a first P.R.Trigrep, characterized in that, with a chain of extension of functional possibilities and increase of noise immunity, it is entered into a second JK -trigger, the first J -input of which is connected to the output of the first K -trigger , the second J input with the first R input of the first JX. the trigger and with the second output of the bodies, and the output with the second R-intake of the first J trigger and with the output of the bus. devices, with the first output the shutter is connected to the J input of the first trigger, and the combined trigger synchronization inputs are connected to the control input of the device. Sources of information taken into account during the examination 1, USSR Author's Certificate No. 191633, cl. N OZ K 5/26, 1965. 2. USSR author's certificate N9 566336, cl. H 03 K 5/26, H 03 K 5/20, 17.O8.72 (prototype). tt