SU598222A1 - Variable length pulse train shaper - Google Patents

Description

(54) A DEVICE FOR FORMING THE SEQUENCES OF VARIABLE DURATION PULSES which are connected to the corresponding inputs of the decoder, the output of which is connected through the first input of the element OR to the input of setting the zero of the summing counter, the output of the element I is connected to the counting input of the subtractive counter, the discharge of which is the sum of the summing counter, the output of the element I is connected to the counting input of the subtracting counter, the discharge of which is the summing counter to the outputs of the bits of the summing counter, and the output of the deactivating counter is connected to the reset input j of the trigger-former, the input ycTaHOB-fki of which is connected to the input of the valves and This input of the summing counter, the output of the trigger generator is connected to the third input of the element and the reset input of the control trigger is connected to the output of the decoder, and the second input of the OR element is connected to the installation input of the control trigger. Fig. 1 shows the structural electrical circuit of the device for generating pulse train of variable duration; Fig. 2 is a timing diagram explaining its operation. A device for forming sequences of pulses of variable duration containing control trigger 1, pulse element OR 2, summing counter 3, reference generator 4, frequency divider 5, valves 6, subtracting counter 7, trigger generator 8, frequency divider 9, element 10 and decoder 11. The device works as follows. at once. The control pulse (Fig. 2a) arriving at the input of control trigger 1, sets it to the state (Fig. 26) and, through the OR 2 element, wraps the summing counter 3, In the summing counter 3, the pulses are successively inclined with a repetition period p. / {fig. 2a) obtained by dividing the frequency Pd of the reference oscillator 4 by the division factor kj of the frequency divider 5. Each new state of the summing counter 3 through gates 6 is fed to the recording into the subtracting counter 7. At the same time, the pulse from divider 5 sets the trigger driver 8 to state (FIG. 2d). Alternately cheating the numbers recorded in the subtraction of counter 7, pulses are output from the period.

. (Fig.2d) on. lero is the counting input from the output of the second frequency divider 9 (with the division factor Kj) through the element And 10.

Claims (1)

"The invention of the Device for the formation of sequences of pulses of variable duration, containing a reference pulse generator, element I, trigger. At the moments of zeroing of the subtractor 7, the pulses formed at its output return the trigger forger 8 to the initial state. Thus, at the output of the device, a sequence of pulses (Fig. 2d) is formed with a repetition period T and a duration of 1 ravine: - ilo-n, where the sequence number of the pulse in the sequence. Changing the division factor t) you can adjust the duration of the pulses 1 j, and the period of the pulses in the sequence T-select the necessary K coefficient. 4 The duration of the pulse sequence or the number of pulses in the sequence depends on the state in which the decoder 11 is installed, fixing the number of pulses in the summing counter 3 and forming a pulse (Fig. 2g), which sets triggering trigger 1 to the initial state and, through the element OR 2, resets the summing counter 3 to n ol To obtain a cyclic sequence of pulses with a swinging duration, it is sufficient to apply a constant voltage to control trigger 1, which will always maintain it in one state. The possibility of independent tuning of the frequency of the pulses, their duration and the duration of the sequence itself in a wide range without reducing the accuracy of the formation expands the capabilities of the device when used in automation, pulsed and measuring equipment and, especially, as a calibrator in telemetry systems with pulse-width and time -pulse modulation of signals, since the range of variation of the pulse duration in the sequence at the output of the device can be arbitrarily extended, choose a corresponding frequency of the reference oscillator and the capacitance counters. The proposed device for generating pulse duration sequences of variable duration can also be used in television to form image signals of the triangle, rectangle type, and combinations thereof.