SU1203535A1 - Device for functional coding of pulse-width signals - Google Patents

Description

one

The invention relates to automation and supervisory techniques and can be used in the nonlinear conversion of pulse-width signals into a code.

The aim of the invention is to improve the coding accuracy by reducing the methodological approximation error.

The drawing shows a block diagram of the proposed device.

The device for functional coding of pulse-width signals contains the first second and third quarter, five and sixth transducers 1-6 code - frequency, first and second blocks 7 and 8 of subtraction, first second and third reversible counters 9-11, first and the second element And 12 and 13, the element OR 14, information input 15, the first, second; the third, fourth, fifth and sixth inputs are 16-21, the bus 22 is the scale code and the output is 23,

The device works as follows. image

At the initial time, counters 9-11 are reset. The bus 22 is given a scale code, the input 15, a pulse-width signal with a relative duration of O, and the inputs 16-21, respectively, pulse sequences of reference frequencies

 The fo-1 Log Li fou S ios 06, in this case, to eliminate the imposition of pulse signals, these reference sequences

 The values must be phase-shifted relative to each other for a time equal to or greater than the one, and the response time of the reversible counters is 9-11. Converters 1-6 code - frequency carry out a linear conversion of the code in the frequency of 9. produce pulse sequences with frequencies, the mean values {which are proportional to the corresponding control codes, and can be determined in the form of binary frequency multipliers with a dynamic frequency output.

The first pulse, which appeared at the output of the element 12, is recorded in the counter 9. Transducer 2 begins to generate a pulse sequence, since the code controlling it from the output of counter 9 is different from zero. The pulse sequence from the output of the converter 2 enters-, em to the subtracting input of counter 9 and

at the first input of the element OR 14. At the same time, the code from the output of the counter 9 is fed to the subtractor, and the input of the subtraction unit 7. At the same time, the control code on converter 1, the equal difference between the scale code and the output code of counter 9, decreases, which leads to a decrease in the number of pulses arriving at the summing input of counter 9 through element 12 during the operation of the pulse signal of the argument . The reversible counter 10 works in the same way, the forward circuit of which includes the subtraction unit 8, the transducer 3 and the element 13, and the reverse circuit the converter 4. The summing input of the counter 11 receives the total pulse sequence from the output of the element OR 14 and the subtracting one from the output converter 6 included in the negative feedback circuit. Counter 11 operates similarly to counter 9.

The operation of the device is based on the iterative principle of averaging pulsed flows using a frequency-pulse tracking system S5 as a comparison circuit incorporating a misalignment signal using a reversible counter. Thus, using the counter 11, the frequencies of the pulsed streams arriving at its inputs are subtracted and the difference obtained is integrated with the result in the form of a binary code. In addition to the main negative feedback loop, including counter 11, there are two additional ones based on counters 9 and 10, respectively. The condition of the dynamic equilibrium of the device is the equality of the increments of the codes of the summing and subtracting circuits in each reversible counter during the period of the pulse-width argument signals, i.e. the equality of the average values of the frequencies of the pulse sequences arriving at the summing and subtracting inputs of the counters.

The condition of the dynamic equilibrium of the counter 9, taking into account the operation of the transducers 1 and 2, the blasla 7 of the subtraction and the And 12 element is

QCN-Njl -L.Ngi

Yd and

output code counter 9; Converter transducer code — frequency, whence the average value of the frequency from the output of transducer 2 arriving at the first input of the element OR 14 is defined as

og

year

6f

01

N

01 f (1)

Similarly, the average value of the frequency from the transducer 4 input to the third input of the element OR 14,

TJ --- T

& i

03

ots

fob®

N

The second input of the IL 14 element receives a pulse sequence 20 from the output of converter 5, the average frequency of which is equal to

- frequencies P,

 OS

S

(3)

IR

From the output of the element OR 14 enters

The totalizing input of the counter 11, on the subtracting. the input of which is supplied with a balancing frequency from the converter 6 code.

Proceeding from the dynamic equilibrium condition for frequencies (1), (2) and (3) arriving at the summing input of counter 11, and the frequency arriving at its subtracting input, the expression for the code of the device has the form

 foz, ots fob c. .

- (if / -ti (; (b.cf.9) r

Expression (4) is a rational function.

 20

N, --a, .a

At

jX ai-i-cxjx

NOC

аъ X t

g, X ,. .av,, (5)

106 to tot

25

lot .-. fу;

five

which approximates the function y, with XfeLO, 1; 1.0,

Claims (1)

DEVICE FOR FUNCTIONAL CODING OF WATER-PULSE SIGNALS, containing four code-frequency converters, two subtraction units, two AND elements and three reversible counters, the output of the first code-converter is frequency connected to the first input of the first element AND, the frequency input is connected to the first input devices, and the code input - with the output of the first reading unit, the first input of which is connected to the scale code bus, and the second input is combined with the code input of the second code-frequency converter and connected to the output of the first dividing counter, the frequency input of the second code-to-frequency converter is connected to the second input of the device, and the output is by subtracting the input of the first reverse counter, the summing input of which is connected to the output of the first element And, the second input of which is informational “device input, the output of the third code-frequency converter is connected to the first input of the second element And, and the code input to the output of the second subtraction unit, the first input of which is combined with the first input of the fourth code-frequency converter and is connected to the second reverse counter, the output of the fourth code-to-frequency converter is connected to the subtracting input of the second reverse counter, the summing input of which is connected to the output of the second AND element, the output of the third reverse counter is the output of the device, characterized in that, in order to increase the encoding accuracy, it introduced the fifth and sixth code frequency converters and the OR element, the first, second and third inputs of which are connected to the outputs of the second, fourth and fifth frequency code converters That is, the output is connected to the summing input of the third reversible counter, the subtracting input of which is connected to the output of the sixth code-frequency converter, the frequency inputs of the third, fourth, fifth and sixth code-frequency converters are connected to the third, fourth, fifth and sixth inputs of the device, respectively, the second the input of the second subtraction unit is combined with the code input of the fifth code-to-frequency converter and connected to the scale code bus, the second input of the second element And is connected to the information input of the device, code vy sixth input code converter of - frequency connected with the output of the third reverse counter. OR 14. One counter 9 block input ί