SU807285A1 - Function converter of pulse number into digital code - Google Patents

Description

(54) NUMBER FUNCTIONAL TRANSFORMER

PULSE IN DIGITAL; st code

The device relates to a digital measuring and computing technique, in particular, to a device for the functional transformation of a temporal pulse sequence into a digital code. A functional converter for obtaining power dependencies is known, which contains a reference frequency generator, AND and OR elements, a frequency divider, a trigger, a first pulse counter connected to a digital input with an output of the first AND element, and a bit output with the first inputs of the AND transfer elements groups, the second pulse counter, the bit outputs of which are connected to the first inputs of the transfer elements of the second group, and the control unit connected by the outputs respectively to the first input of the first element I, to the input controlling reversing the second counter and to a first input of OR f. . . The disadvantage of the device is a narrow class of reproducible. The closest in technical essence to the proposed is a functional transducer containing the first summing counter. trigger, reference frequency generator, delay element and control unit P3 A disadvantage of the known device is the impossibility of reproducing the class of functions X X Y k (-) k. The purpose of the invention is to expand the class of reproduced functions due to the possibility of calculating functions of the form -A G. that the device contains the first summing counter, the reversible counter, the first adder-subtractor, two groups of elements AND with the elements OR on the code and the frequency divider, with the outputs of the first. its counter and reversible counter connected to the first inputs of the elements And, respectively, the first and second groups, the input. The first summing counter by the middle of the output of the first adder-subtractor, the first input of which is connected to the output of the first OR element, whose inputs are connected to the outputs of the AND elements of the first group, additionally introduced a second counter, the subtractive counter, the third and fourth groups of the AND elements, the third and fourth the OR elements, the second adder-subtractor, the switch h, the control unit containing the inverter, a pulse shaper and two keys, the first inputs of which are connected to the power source and the second to the bus zero potential, the output of the first switch is connected to the control input of the switch, the output of the second key is connected to the summing output and through the inverter to the input of the subtractor, reversible counter, the input of the pulse shaper is connected to the input of the control unit, and the output of the generator of the pulse is connected to the input of the subtractive counter and the second input of the first summatr-subtractor, while the outputs of the bits of the subtracting counter are connected to the second inputs of the elements of the first and second groups, the outputs of the elements of the second group through the second .OR element OR under Connected to the input of the second summing counter and pergume to the input of the second adder-subtractor, the second input of which is connected to the output of the third element OR, whose inputs are connected to the outputs of elements AND of the third group, the first and second inputs of elements AND of which are connected respectively to the outputs of the first and second summing counters; the output of the second adder-subtractor is connected to the first input of the switch; its second input is connected to the output of a frequency divider, the input of which is connected to the output of the fourth element OR, the inputs to Secondly, they are connected to the outputs of elements AND of the fourth group, the first and second inputs of elements AND of which are connected respectively to the outputs of the first summing counter and the reversible counter, the input of which is connected to the output of the switch. The drawing shows the block diagram of the device. The device consists of a reversible counter 1, a subtracting counter. 2,. summing counters, 3rii 4, groups of elements And 5, 6, 7 and 8, adders-subtractors 9 and 10, frequency divider 11, switch 12, control unit 13, elements OR 14, 15, 16 and 17. The device works as follows . Before the start of the conversion, the counters cTBei Ho begin with the numbers a and a-j, the counters 4 are reset, and the counter 2 records the number equal to the counting factor of the counters. With the start of the conversion, the impulses of the converted sequence begin to arrive at the device, the total number of which is equal to x. If dx is the increment of the input stream, and dxjjfj is the increment of the stream at the output of the group of elements 5, then the increment of the stream dx at the output of the accumulator 9 in the summation mode is dx + dx dxQj, generated by the binary multiplier on the counters 2 and 3 where a is the counter conversion factor; x is the number recorded in the Transformation process in the second counter. Since counter 2 is subtractive and the number a was previously written in it, then -X, a - X. Taking into account equations (1), (2) and (3), we get the expression 3fn- 2 Integrating the expression 4) and taking into account the initial conditions, we get X If the output of the control unit 13 to the control input of the switch 12 receives a signal to allow passage of the reversible counter signal from the output of the adder-subtractor 10, then the increment of the pulse flow at the input of counter 1 is equal to the sum of the increments of the flows formed by the corresponding but binary multipliers on counters 1 and 2 , 3 and 4. dx. + dx ,, dx jj By reading expressions (5), (6), (7 and (8), we get

dx, .dx,). (S) V m V dm

When counter 1 is in addition mode, the number in the latter increases according to the equation

g a + j (1 + lu -) dx, (10)

 t 1, the solution of which is k x S. (-ъ When the counter -1 operates in the subtraction pe / sim, xa, (T. aj The final expression for the dependency is + type 1 / (looks like V-. If the control input switch 12 is allowed to pass the signal from the input of the frequency divider 11, the increment of the pulse flow at the input of the counter 1 is defined by the expression (a) where W1 / rt is the transmission coefficient of the frequency bodies 11. Solving equation (13) with the equation ( 4) is the following: The sign of the exponent is defined as in the previous case; Thus, the device can realize a power function with a negative negative or positive index, as well as a functional JL 5. Dependence of the form of the device can be used to linearize the characteristics of frequency sensors, which are described by similar transcendental expressions. converter in linearizer allows to significantly reduce hardware costs, compared1 "with linearizers based on methods of no-linear or piecewise non-linear approximation, while increasing the accuracy and reliability of these devices,

Claims (2)

1. Author's certificate of the USSR 454552, class, G About F 7/38, 1977. 2. Authors certificate of the USSR 553629, cl. G About F 7/38/1977.