SU1267411A1 - Device for differentiating pulse-frequency signals - Google Patents

Abstract

The invention relates to the field of automation and computing. The device contains a shaper of the time interval of measurements, three blocks. ka analysis of increments, two counters, a decoder, a trigger, a register, an output digital-to-analog converter, a pulse generator, a delay element, and AND, OR, and NOT elements. Each increment analysis block contains two AND elements, a two-element OR, two counters, a code comparison node, two triggers, and a pulse shaper. During operation, each of the increment analysis blocks compares the number of pulses of differentiable frequencies received at its first and second counting inputs, and the signals from its outputs Greater, Less and Equal controls the addition until the incoming pulses are equal and the accumulated increments are cleared. At the same time, the first unit of analysis of increments in each i-th measurement cycle compares the increments of the pulses of the first and second differentiated frequencies, the second and third units of the analysis of increments compare the obtained differences of increments for I (i, i + 1) and (i-1, i) - x measures (L respectively, and the first counter at the end of each measurement cycle records the current value of the difference in increments, which determines the value of the time derivative of the frequency difference of two frequency-pulse signals. Thus, the expansion of the range of igaets due O differentiating the frequency difference -4 bystro4 while improving effect calculations. 1 yl.

Description

The invention relates to automation and computing and can be used in discrete and digital systems for automatically controlling various objects: and technological processes. The purpose of the invention is to expand the range of applications by differentiating the difference between the frequencies of two frequency-pulse signals with increasing speed. The drawing shows a block diagram of an apparatus for differentiating pulse frequency signals. The device contains a shaper 1 time interval measurements, the first unit 2 analysis increments, the first counter 3, the decoder 4, the generator 5 pulses, the element NOT 6, the first, second, third and fourth elements And 7-10, the second unit 11 analysis of increments, fifth And the sixth elements And 12 and 13, the first element OR 14, the third block 15 of the increment analysis the second counter.16, the delay element 17, the second and third elements OR 18 and 19, the register 20, the digital-to-analog converter 21, the fourth and fifth elements OR 22 and 23 and trigger 24. Each block 2, 11, and 15 of anapis increments contains there are two elements AND 25 and 26, two elements OR 27 and 28, two counters 29 and 30, node 31 compared to a coder, a driver of 32 pulses, two triggers 33 and 34 and has first and second counters 35 and 3, the first and second count inputs 37 and 38, first and second inputs 39 and 40 addition pulses, comparison resolution inputs 41 and outputs Equal to 42, Greater than 43 and Less than 44 In addition, the first 45, second 46 and third 47 decoder 4 outputs are indicated on the drawing, as well as button 48. The device works in the following way. By pressing the button 48, the shaper 1 of the interval t, the measurement time, which outputs the signal 1 and opens, at inputs 37 and 38, the elements AND 25 and 26 of the increment analysis block 2 for passing the differentiable frequencies fj and f through the elements OR 27 and 28 counters 29 and 30. If the number of pulses arriving at counter 29 and n,..., arriving at counter 30, is the same, the comparison node 31 resets these counters with a pulse from the output of the shaping device 32. If HjQ, the comparison node 31 determines Em, in which the pulse counter received less, and otkryshaet element You are And a 7 or 8 signal from outputs Less than 44 or more than 43 blocks 2 for supplying clock pulses of frequency fj (two orders of magnitude more f1 and f2) from generator 5 to this counter. There is an operation of the first increment of pulses in one of the counters 29 or 30 until they are equal. In this case, the pulses are also received through the element OR 14 into the counter 29 of the incremental analysis block 15, in which the difference is measured, and the difference rijg-pad is found in the first measurement interval. After the first pulse completes, the signal from the output Equal to block 2, the counter 16 together with the decoder 4 connects the input 36 of block 15 to the second complete set (at the end of the second interval t) to the 3D counter of block 15, and simultaneously with this pulse from Equal to 42 block 2 op The interval spanner 1 starts up. In the second measurement interval of duration t, the values of Poo and Pl are determined again. in counters 29 and 30 of block 2 and their difference is F and again, the count is equal to n, but the number of pulses of counting is now stored in counter 30 of block 15 and counter 29 of block 11 (p29). The node 3 of the comparison of block 15 determines, in which of the counters 29 or 30 of the block 15 to send pulses of increment, which simultaneously arrive through the element OR 18 into the counter 3. Thus, after the second interval of measurements in the counter 3 and register 20 through Wits first value Uj p ,,,,. At the end of the third interval t ,, 1, from the 3rd output 47 of the decoder 4 will switch the input 38 of the block 11 to the arrival of the pulses of increment (until equality Pgd ni, (j in block 2) to the counter 30. The comparison unit 31 determines which of the counters (29 or 30), the number of pulses is less recorded and will turn on to equal Pg9, this will bring pulses to the meter 29 simultaneously, where Dp J will be written. Since, after three intervals, three counts return to counter 16

 one

to the zero state, then the whole considered cycle of work, including three intervals, will be repeated. Therefore, at the end of each measurement interval the device

d ()

The property has a value of dt

the code at the output of register 20 and the corresponding voltage at the output of converter 21.

The considered features of the work show that

(one)

29 ,. f. to; (2)

thirty,

23.5 I fi -fa (3)

PM, 1p29, GPzo, () n ,, i ln, 9 -njpJ t, -A (f, -f2), (5)

where A (fi -fj) is the change in the difference of frequencies fj and fj on two measurement intervals.

If, for example, we choose С „1, then Lp will be equal to the frequency difference in hertz, and the magnitude of the derivative

flfi: -ikl

(lu-r-aL.; .. ej t

with the Hz / s dimension.

The derivative sign is fixed on the trigger 24. When O, the trigger is set to one, and when -dp -i O is zeroed.

Thus, the proposed device allows to obtain the differential of the frequency difference between two frequency-pulse signals, which expands its scope.

Claims (1)

Invention Formula A device for differentiating pulse frequency signals, comprising a pulse generator, a trigger, a first counter connected by an input of the initial setup to the first output of a delay element, and an output to an information input of a register connected by an input, recording resolution to the second output of the delay element, and output the input of a digital-to-analog converter, the output of which is an output of a device characterized in that, in order to expand the scope of application by differentiating the frequency difference between two frequency-imp lsny signals with increasing operating speed it is further administered three blo674114 increment analysis, the second counter, the decoder, the AND, OR and NOT elements and the shaper of the measurement time interval, connected by the first trigger input to the control input of the device, the second trigger input to the output Equal to the first increment analysis block and the counting input of the second counter, and output to the element input NOT and to the first and second inputs of the resolution of the first block of the analysis of increments connected by the first and second counting inputs to the first and second information inputs of the device, the first input of the addition pulses - with the output of the first element AND and the first input of the first element OR, the second input of the addition pulses - with the output of the second element AND, and the second input of the first element OR, the comparison resolution input - with the output of the element NOT, the output More often - with the first input of the second element AND, and output Less than 25 with the first input of the first element And connected by the second input to the output of the pulse generator, the second input of the second element And and the first inputs of the third, fourth, fifth and sixth elements of And, while the output of the second counter is connected to input the decoder's house, the output of the first element of the Sh1I is connected to the first and second counting inputs of the second and third increment analysis blocks, and the output of the third stage  element I is connected to the first input of the addition pulse of the second unit of analysis of increments and the first input of the second OR element connected by the output to the counting input of the first account  by the second input to the output of the fourth element I and the second input of the impulses of the second block of the analysis of increments, the third input to the output of the fifth element I and the first  the input of the addition pulse of the third increment analysis block, and the fourth input - to the output of the sixth And element and the second input of the addition pulse of the third incremental analysis block, 50 connected by the output Equal to the first input of the third element OR, the output More - to the BTOpbiM input of the sixth element AND and the first input of the fourth element OR, and the output Men 55 above with the second input of the fifth element AND and the first input of the fifth element OR connected to the second input to the output Less than the second increment analysis block and the second input of the third element I, and the output to the single installation input of the trigger, the output of which is the output of the derivative device, and the zero input connected to the output of the fourth IL element What is connected by the second input to the second input of the fourth element AND and the output More than the second increment analysis block, connected by the output Equal to the second input of the third OR element, the output of which is connected to the input of the delay element and the zero reset input, while the second increment analysis block is connected the enable input of the comparison with the first output of the decoder to the first input of the resolution of the account of the third block of the analysis of increments, whose resolution is connected to the second output of the decoder and the first input of the resolution This second increment analysis block, connected by a second count resolution input to the third decoder output and a comparison resolution input of the third increment analysis block, each increment analysis block contains two AND elements, two IPI elements, two counters, a code comparison node, two triggers, and a driver and ; w-1ulsov5 with the first element And is connected by inputs to the first counting input and the first input of the block count resolution analysis input, and the output to the first input of the first element OR connected by the second input to the first input input pulse of the increment analysis block, and the output to the counting input of the first counter connected by the output to the first input of the code comparison node connected by the second the input to the output of the second IK account, the output of Equal to the input of the pulse precursor, and the outputs More and Less to the information inputs of the first and second triggers, respectively, the write enable inputs of which are EC ina with the resolution enable input of the increment analysis block, zeroing inputs with pulse driver output, Equals equal to the increment analysis block and zero reset inputs, and outputs with the Bigger and Less outputs of the increment analysis unit, respectively, and the counter input of the second counter Pod1: is connected to the output of the second an OR element connected to the first input with the second pulse input of the increment analysis block, and the second input to the output of the second AND element whose inputs are connected to the second counting input and the second enable input account blokaanaliza increments.