SU1224788A1 - Device for determining centre of area of amplitude-modulated pulses - Google Patents

Abstract

The device relates to digital measurement technology and can be used in automatic control systems and instruments for measuring the temporal position of pulses. The purpose of the invention is to expand the functionality. The goal is achieved by introducing quantization thresholds that are tunable depending on the maximum voltage value of the amplitude modulated pulse. The device contains tires 1 and 2, comparator 3, electronic key 4, delay elements 5 and 15, logic elements (LE) OR 6, 10, 20 and 25, peak detector 7, differentiation elements 8, 9 and 23, LE 11 and 21, counters 12 and 22, trigger 13, pulse generator 14, input signal quantization unit 16, comparator 17, frequency divider 19, LE NE 24, comparison unit 26, output bus 27 connected to the reset inputs of counters 12 and 22 and detector inputs 7 and LE OR 25. 1 Il. Ate tsD yu 4: 00 00

Description

The invention relates to digital measurement technology and can be used in automatic control systems and instruments for measuring the temporal position of video pulses.

The purpose of the invention is to expand the functionality of the device by introducing quantization thresholds that are tunable depending on the maximum voltage value of the amplitude modulated video pulse.

The drawing shows a block diagram of the device for determining the center of the area of the pulses.

The device for determining the center of the area of the amplitude-modulated pulses contains an input bus 1 for applying voltage of amplitude-modulated pulses, bus 2 for feeding the threshold detection voltage, comparator 3, electronic key 4, delay element 5, first element OR 6, peak detector -7, differentiation elements 8, 9, the third element OR 10, the first element 11 and 11, the first counter 12, trigger 13, the pulse generator 14, the second delay element 15, the input signal quantizing unit 16 containing the i 7 comparators and the voltage divider, done And on a resistor (R), a group of elements AND 18, a frequency divider 19, performed, for example, on a trigger with a counting input, a second element OR 20, a second element AND 21, a second counter 22, a differentiation element 23, a element NOT 24, a fourth element OR 25, reference block 26, device output bus 27. Moreover, the first and second outputs of the delay element 5 through the element PfflH 6 are connected to the first input of the block 16, the counting input of the trigger 13 and the first input of the generator 14 are interconnected, the output of the generator 14 is connected through the corresponding outputs of the delay element 15 to the first inputs of a group of elements And 18, the second inputs of each of the group of elements AND are connected to the corresponding outputs of the quantizing unit 16 of the input signal, the outputs of group 18 are connected to the inputs of the element OR 20, the output of which is connected to the input of frequency divider 19, the reset inputs of counters 12 22 are interconnected, and The discharge input counters 12 and 22 through the comparing unit 26 connected to the output device, the input device 1 ness connected to first inputs of the comparator 3 and a key 4. The input bus 2 is connected to the second

the input of the comparator 3, the output of which is connected to the second input of the key 4, the output of which is connected to the input of the delay element 5 and the first input of the peak detector 7, the output of which is connected to the second input of the input signal quantizer 16. The outputs of the element 5 are connected respectively through the first and second elements 8 and 9 of differentiation with the inputs of the third

element OR 10, the output of which is connected to the combined inputs of the generator 14 and trigger 13, the direct and inverted outputs of which are connected to the first inputs of the first II and sec. 21 elements AND, respectively, whose outputs are respectively connected to the counting inputs of counters 12 and 22. The second the input of the second element And 21 is connected to the output of the second

element OR 20. The second input element And 11 is connected to the output of the frequency divider 19. The first output of block 16 is through the third differentiation element 23 and the element NOT 24 is connected to the first input of the element OR 25, the output of which is connected to the second input of the generator 14. The output bus 27 of the device is connected to the reset inputs of counters 12 and 22 and the inputs of the detector 7 and the element OR 25 .

The device works as follows.

In the initial state, a threshold detection voltage Unop is applied to the bus 2. The key 4 is opened by the zero level from the output of the comparator 3. Counters 12 and 22 are reset, the voltage at the output of the peak detector 7 is zero. The generator of 14 pulses is stopped, the trigger 13 - at zero

condition. The unit level from its inverse output is present at the first input of the element I 2I, and the zero level from its direct output keeps it closed

the first input is element 11. And the group of elements 18 is kept in the closed state by zero levels on the second input from the corresponding outputs of the amplitude quantizer 16.

A bundle of arbitrary-shaped video pulses is fed to the bus I of the device. When the detection threshold is exceeded

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the voltage of the first video.ful fjca at the output of the comparator 3 appears to be a single level that closes key 4, thereby passing an amplitude-modulated pulse to the inputs of delay element 5 and peak detector 7. The peak detector selects the maximum voltage value the first video pulse, which is fed to the first input of the quantization unit 16, where it is divided into n equal parts. In the delay element 5, the video pulse is delayed by the delay time t equal to the maximum possible duration of the video pulse at the first threshold level a priori known and by the delay time t, which is longer than the time t for the device operation time. At a time less than or equal to t ,. from the beginning of the detection, the pulse voltage becomes less than U |, the zero level appears at the output of the comparator 3, which opens the key 4. After the time from the beginning of the detection, a video pulse appears at the tap of the delay element 5, from which differentiation element 8 forms a pulse, used to start the generator 14 pulses and transfer the trigger 13 to one state. The unit level from the direct output of the flip-flop 13 is fed to the first input of the element 11, and the zero level from its inverse output blocks the element i 21. The pulse from the retraction of the delay element 5 through the element OR 6 also goes to the second input of the quantization unit 16, which leads to. the appearance at its first output of a single level, which is fed to the second input of the first element AND of group 18. A pulse sequence from the output of the generator 14 pulses is fed to the delay element 15 with cn output, and the delay time between two adjacent outputs It is chosen equal to the transient time in the meters 12 and 22. The pulse sequence from the first output of the delay element 15 passes through the first element AND group 18, the element OR 20, the frequency divider 19 (every second pulse is passed) element 11 to the counting input of the counter 12. When the coincidence of the voltage of the video pulse with the value lJnop.2 at the second output of block 16

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A single level is applied to the second input of the second element AND of group 18. A sequence of pulses from the first and second output of the delay element leads, respectively, through the first and second elements AND of group 18 along the above circuit to the counting input of the counter 12.

Q The device operation algorithm when the voltage of an amplitude modulated pulse coincides with the voltage values of the other thresholds is similar to that described.

JJ At the moment of intersection, the negative impulse of the first impulse of the quantization block 16 appears from the decay of the video impulse of the value of la, from which the element 23

An impulse is formed. Inverted by the element NOT 24, this pulse through the element OR 25 stops the generator of 14 pulses.

2c After a time from the beginning of detection, a video impulse appears at the output of the delay element 5, from which differentiation element 9 forms a pulse used to start the pulse generator 14 and switch the trigger 13 to the zero state, which ensures the passage of pulse sequences from the output of the OR element 20 through the element And 2 to the counting input

5 counter 22. The work of the other nodes of the device is similar to that described above.

 thirty

At the moment the codes in counters 19 and 22 coincide, the comparator block 26 generates a signal that zeroes the latter, stops the pulse generator 14, zeroes the peak detector 7, and sends a signal characterizing the position of the center of the video pulse area to the device bus 27. The device is in its original state.

When the detection voltage of the second (third, etc.) packet is exceeded, the device operates as described above, the peak detector 7 extracts the maximum voltage of each video pulse, and block 16 divides it into equal parts.

Claims (1)

Invention Formula A device for determining the center of the area of amplitude-modulated pulses, comprising a pulse generator, a trigger, first and second pulse counters, a comparison unit, first and second OR elements, an input signal quantizer, first and second delay elements, a frequency divider, a group of AND elements, the first and second outputs of the first delay element through the first OR element are connected to the first input of the quantizing input signal, the counting input of the trigger and the first input of the pulse generator are connected to each other, the output d the pulse generator is connected through the corresponding taps of the second delay element to the first inputs of the group of elements And, the second inputs of each of the group of elements AND are connected to the corresponding outputs of the quantizing input signal, the outputs of the group of elements AND are connected to the inputs of the second element OR, the output of which is connected to the input of the divider the frequencies, the reset inputs of the first and second counters are interconnected, the discharge outputs of the first and second pulse counters are connected to the output of the device through the comparison unit, and - It is distinguished by the fact that in order to expand the functional capabilities of the device, a comparator, an electronic key, a peak detector, the first, second, third differentiation elements, the third and fourth elements OR, the compiler I. Ma.zurov Editor N. Slobod nick Tehred are entered into it. I.Veres Corrector V. Booth ha Order 1951 / 47- Circulation 398 Subscription VNISHI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 the second and second elements are And, the element is NOT, the first input of the device is connected to the first inputs of the comparator and the electronic key, the second input of the device is connected to the second input of the comparator, the output of which is connected to the second input of the electronic key, the output of which is connected to the input 0 of the first delay element and the first input of the peak detector, the output of which is connected to the second input of the quantized input signal, the first and second outputs of the first element The 5 delays are connected respectively via the first and second differentiation elements to the inputs of the third OR element, the output of which is connected to the combined inputs of the generator. i.trigger pulses, the direct and inverse outputs of which are connected to the first inputs of the first and second elements, respectively, the outputs of which are respectively connected 5 to the counting inputs of the first and second pulse counters, the second input of the second element AND is connected to the output of the second element OR, the second input of the first element AND is connected to the output of the remote control of the frequency divider, the first output of the quantizing input signal through the third differentiation element and the element is NOT connected to the first the input of the third element .ILI, the output of which is connected to the second input of the pulse generator, the output bus of the device is connected to the reset inputs of the first and second counters, the second inputs of the peak detector and the quarter second OR element.