SU1164889A1 - Frequency-to-number converter - Google Patents

Abstract

1. A FREQUENCY CONVERTER containing a reference frequency generator, a first two-input switch, two exponential generators, a first three-input switch, a counter and pulse generator, the input of which is connected to the input of the converter, and the output to the first input of the counter and the first input of the first two-input switch, characterized in that, in order to increase functional reliability and accuracy, three pulse frequency dividers, a second three-input key, a second and a third two-input keys, a digital comparator, the first and the second delay element, the input of the first delay element connected to the output of the pulse generator, and the output to the input of the second delay element, the second, the counter input and the first input of the first three-input key, and the output of the second delay element connected to the first input of the second two-input key, the second the input of which is connected to the output of the first frequency divider, and the output to the third input of the counter, the output of which is connected to the first input of the first exponential generator, the second input of which is connected to the output of the first three-input key, the second input of which is connected to the output of the second frequency divider, the input of which is combined with the inputs of the first and third frequency dividers and connected to the output of the reference frequency generator, the first input of the second exponential generator connected to the output of the first two-input switch, and the first input of the third two-input a key whose output is soy (Linen is with a converter output, the first input of a digital comparator is connected to a fixed-value bus, the second input is connected to the output of the first expo entsialnogo generator, and The output to the second input of the third two-input key, the third row BJtoa trehvhodovogo first key and the first key vhoduvtorogo trehvhodo00 Vågå, whose second input 00 is connected to the output of the first delay member, the third input - to the output w. the third frequency divider, and the second second input of the second exponential generator, the third input of which and the third input of the first exponential generator are connected to the output of the pulse former, the second input of the first two-input switch is connected to the maximum value bus. 2. The converter according to claim 1, in which each exponential generator contains

Description

a subtracting counter and a controlled frequency divider, the first input of which is connected to the second input of the exponential generator, the second to the third input of the exponential generator, and the third to the output

an exponential generator on the output of a detracting counter, the first input of which is connected to the first input of an exponential generator, and the second input - to the output of a controlled frequency divider.

The invention relates to computer technology and can be used as an input converter of information defined by a stream of low or low-frequency pulses, as well as an integral part of pulse frequency computing devices for information-measuring systems operating with frequency sensors. A frequency converter is known, which contains a reference frequency generator, a control unit, counters, a key system, an assembly circuit that performs a hyperbolic transformation x — using exponential approximations ij. The disadvantages of the converter are the narrow conversion range and low accuracy. The closest to the proposed technical entity is a digital frequency meter containing a reference frequency generator, the first drive; an input key, two exponential generators, the first three-input key, a counter and a pulse shaper, the input of which is connected to the input of the converter, and the output with the input The counter and the first input; The first two-input key, the output of the reference frequency generator is connected to the second input of the first two-input key, and its output is connected to the first input of the exponential generator, information The input is connected to a constant bus; the first output of the exponential generator is connected to the first input of the first three-input switch, the second input of which is connected to the second output of the exponential generator; the information outputs of the counter are connected to the corresponding inputs of the second exponential generator, the output of which is connected to the third input of the first three-way. the key, and its output is connected to the combined control inputs of the first and second exponential generators, the information input of the second exponential generator is connected to the bus with a maximum value of 2J. The disadvantages of this device are low reliability and low conversion accuracy. The purpose of the invention is to increase the functional reliability and accuracy. The goal is achieved in that the frequency converter contains a reference frequency generator, the first two-input key, two exponential generators, the first three-input key, a counter and a pulse shaper, whose input is connected to the input of the converter, and the output to the first input of the counter and the first input of the first two-input key, three pulse frequency dividers, the second three-code key, the second and third two-input keys, a digital comparator, the first and second delay elements, the input of the first element of the rear The terminal is connected to the pulse driver output, and the output is connected to the input of the second delay element, the second counter input and the first input of the first three-input key, and the output of the second delay element is connected to the first input of the second two-input key, the second input of which is connected to the output of the frequency divider, and the output - to the third input of the counter, the output of which is connected to the first input of the first exponential generator, the second input of which is connected to the output of the first three-input key, the second input of which is connected to the output ohm second frequency divider, the input of which is combined with the inputs of the first and third frequency dividers and connected to the output of the reference frequency generator, the first input of the second exponential generator is connected to the output of the first two-input key, and the output to the first input of the third two-input key, the output of which is connected to the output of the converter, The first input of the digital comparator is connected to a fixed-value bus, the second input is connected to the output of the first exponential generator, and the output to the second input of the third two-inputs key to the third input of the first three-input key and the first input of the second three-input key, the second input of which is connected to the output of the first delay element, the third input to the output of the third frequency divider, and the output to the second input of the second exponential generator, the third input of which is the third the input of the first exponentially generator is connected to the output of the pulse former; the second input of the first two-input switch is connected to the bus of the maximum value. Each exponential generator contains a detracting counter and a controlled frequency divider, the first input of which is connected to the second input of the exponential generator, the second to the third input of the exponential generator, and the third to the output of the exponential generator and the output of the reading counter, the first input of which is connected to the first input of the exponential generator , and the second input is to you, the course of the controlled frequency divider. FIG. 1 shows the structure of the device; in fig. 2 is a timing diagram illustrating the operation of the second clock of the converter; in fig. 3 is a time pulse diagram illustrating the operation of the device. . Frequency-code converter consists of 1 reference frequency generator, three dividers 2-4 frequencies. 894 two digital exponential generators 5 and 6, two three-input keys 7 and 8, three two-input keys 9-1, a counter 12, a digital comparator 13, two delay elements 14 and 15, a driver 16, the output of which is connected to the first input of the counter 12, the first input key 9 and the input of the first delay element 14, the output of which is connected to the input of the second delay element 15, with the second input of the counter 12 and the first input of the key 7, and the output of the second delay element 15 connected to the first input of the key 10, the second input of which is connected to Delhi exit Ate 2 frequencies, and the output to the third input of the counter 12, the output of which is connected to the first input of the digital exponential generator 5, the second input of which is connected to the output of the key 7, the second input of which is connected to the output of the divider 3 frequency, the input of which is connected to the output of the generator 1 the reference frequency and the inputs of dividers 2 and 4 frequencies, the first input of the exponential generator 6 is connected to the output of key 9, and the output is connected to the first input of the key 11. The second input of digital comparator 13 is connected to the output of digital exponential generator 5, and you one to the second key input 11 and to the third key input 7 and the first key input 8, the second input of which is connected to the output of the first delay element 14, the third input to the output of the 4 frequency divider, and the output to the second input of the digital exponential generator 6, the third input is the same as the third input of the first digital exponential generator 6 is connected to the output of the imaging device 16, the Digital Expo, the potential generators 5 and 6 are based on digital integrators closed to themselves, for example digital serial integrators types on binary multipliers, and in this case contain subtractive counters 17 and 18 and the correct parts 19 and 20 frequencies, the first inputs of which are connected to the second, and the second to the third inputs of digital exponential generators 5 and 6, and the third to the outputs These generators are connected to the corresponding first inputs of generators 5 and 6, and the second to the outputs of the corresponding controlled dividers 19 and 20 of the impulse frequency. The input of the driver 16 is the input 21 of the driver 16 and the entire device. The first input of the digital comparator 13 is the input 22 of a constant value Np. The second input of the key 9 is the input 23 of a value proportional to the maximum value of the input frequency Np, e, c The output of the key 1I is the output 24 of the device. . The device operates as follows. Obtaining a value Np proportional to the frequency of the input pulsed flow takes place in two cycles. In the first cycle, a value is calculated that is proportional to the period of the input pulse flow N-f, by counting the pulses, the calibrated frequency, filling the periods between two adjacent pulses. In the second cycle, a hyperbolic transformation of the value N into the quantity Ыр occurs. Fig. 2 is a timing diagram illustrating the operation of the second clock of the converter. The device consists of two parts. The first part performs the transformations of the first clock cycle, the second part in parallel with the first one performs the conversion of the second clock cycle, moreover, the time is always less than the period of the input pulse stream. . :. . FIG. 3 is a pulse timing diagram illustrating the operation of the device, the input impulses with a frequency F are delivered to the input 21 of the former 16. At a signal from the output of the former 16, a value (FIG.) Proportional to the maximum value of the input frequency is entered into the counter via key 9 18, and the contents of the count; dial 12 is transferred to counter 17. A pulse delayed by delay delay element 14 (FIG. 36) wraps the counter 12 and connects the inputs of controllable dividers 19 and 20 of the frequency h and the corresponding keys 7 and 8 896 and dividers 3 and 4 pulse frequencies s to the generator output digital I and launches exponential generators 5 and 6 (at time t). The pulse from the output of the delay element 15 (fig. Sv) connects through the key 10 and divider 2 frequency generator 1 to the input of the counter 12, which continues counting until the next input pulse (fig. 3 g, d, e). FIG. 3 graphs before the time point T. are shown on an enlarged scale, and after f - on a reduced scale. At this time, the digital exponential generator 5 continues to work until the contents of the N-j-counter 17 compare with the value of Ng (see Fig. 2 and 3, time point t,). In this case, the digital comparator 13 generates a signal that shouts the keys 7 and 8, opens the key 11 and stops the operation of the digital exponential generators 5 and 6, the contents of the counter 18 changed from the value M of the desired value Np (Fig. ZJ), which through the key 11 enters the output device. With the arrival of the next input pulse, everything happens first. Before the converter starts operation, it is necessary to reset the counter 12, then with the arrival of the first pulse, the counter 17 will write zero (Fig. W), the comparator 13 will not work before the second input pulse arrives, the key II will not open and the output will not fail. The frequency of filling the counter 12 and the power supply of the controlled parts 19 and 20 are frequencies, i.e. the output frequency of the pulse flow at the output of the generator 1 (Fig. Zi, k, l) and the coefficients of the dividers 2-4 pulse frequencies are selected from the condition of accuracy, the range of representation of the output value Np and the need to finish determining the value H, before the arrival of the next input pulse. Introduction to the device of three pulse frequency dividers, the second three-input key, two two-input keys ,. DIGITAL comparator, control unit, as well as new inter-unit communications increases its reliability, due to the fact that in the interval between input pulses

71G648898

the digital comparator blocks the output by increasing the magnitude of the exponentiation device and prevents it from failing. due to. Increased accuracy is achieved. their design.

Thebes. 2

Claims (2)

I. FREQUENCY CONVERTER comprising a reference oscillator -frequencies, the first two-input switch, two exponential generators, the first three-input switch, a counter and a pulse shaper whose input is connected to the input of the converter, and the output - with the first input of the counter and the first inputs of the first two-input switch, characterized in that, in order to increase the functional reliability and accuracy, it introduced three pulse frequency dividers, a second three-input switch, a second and third two-input switch, a digital comparator, the first and second delay elements, the input of the first delay element is connected to the output of the pulse shaper, and the output g to the input of the second delay element, the second, the counter input and the first input of the first three-input key, and the output of the second delay element is connected to the first input of the second two-input key, the second input of which is connected to the output of the first frequency divider and the output is to the third input of the counter, the output of which is connected to the first input of the first exponential generator, the second input of which is connected to the output of the first three-input key, the second input of which is connected to the output of the second a frequency divider, the input of which is combined with the inputs of the first and third frequency dividers and connected to the output of the reference frequency generator, the first input of the second exponential generator is connected to the output of the first two-input key, and the output of the first input of the third two-input key, the output of which is connected to the output of the converter, the first input • the digital comparator is connected to a constant-voltage bus •, the second input is connected to the output of the first exponential generator, and the output is connected to the second input of the third two-input switch, 'to the third input of the first three-input key and the first input of the second three-input key, the second input of which is connected to the output of the first delay element, the third input to the output of the third frequency divider, and the output of the second input of the second exponential generator, the third input of which and the third input of the first exponential generator the output of the pulse shaper, the second input of the first. two-input key connected to the bus maximum value. 2. The converter according to π. ^ characterized in that each exponential generator contains a subtracting counter and a controlled frequency divider, the first input of which is connected to the second input of the exponential generator, the second to the third input of the exponential generator, and the third to the output of the exponential generator and the output of the subtracting counter, the first input of which is connected to the first the input of the exponential generator, and the second input to the output of the controlled frequency divider.