SU1274128A1 - Frequency-pulse function generator - Google Patents

Abstract

The invention relates to a pulse technique and can be used to test and tune information-measuring systems and automation systems working with frequency sensors. The circuit of the invention — extending the functionality of the generator — is achieved by reproducing functions with an alternate derivative and with bits and increasing the accuracy of the approximation of a given function. In this generator, the second controlled frequency divider (UDF) 6, the element OR 8, the reversible counter 10 and the converter are added to the generator 11 code - frequency. In addition, the device contains the generators 1 and 2 frequencies, UDCH 3, the counter 4 pulses, the decoder 5, the block 7 switches, the unit 9 initial values. Each of the UDCH contains a frequency divider 12, a switch block 13, and I-ШШ 14. The converter 11 contains a subtracting counter 15, an AND 16 element, a divider 17, and a trigger 18, Device up to (L allows you to zoom in on the frequency of the approximation function and improves the accuracy of the approximation at any scale. 1 il.

Description

The invention relates to a pulse technique and can be used to check and configure information-measuring systems and automation systems working with frequency sensors.

The aim of the invention is to expand the functionality of the generator by reproducing functions with an alternating derivative and with gaps and increasing the accuracy of the approximation of a given function.

The drawing shows a functional diagram of a frequency-pulse functional generator.

The device contains generators 1 and 2 of the reference frequency, the first controlled frequency divider (UDF) 3, • 4 pulse counter, decoder 5, the second controlled frequency divider (UDF) 6, block 7 switches, element OR 8, setter 9 initial values, a reversible counter 10 and converter 11 code - frequency (PCC). Each of the controlled frequency dividers (UDF) '3 and 6 contains a frequency divider 12, the input of which is the input of the UDF, and the outputs through the block 13 of the switches are connected to the first inputs of the AND-OR 14 element, the output of which is the output of the UDF. The second inputs of the AND-OR element 14, which are UDM inputs, are connected to the outputs of the decoder 5, the inputs of which are connected to the outputs of the counter 4. The inputs of the controlled frequency dividers 3 and 6 and the input of the counter 4 are connected to the output of the first generator 1 of the reference frequency.

The preset inputs of the reversible counter 10 are connected to the outputs of the initial value setter 9, the count direction control input is connected to the output of the OR element 8, the counting input is connected to the output of the second UDM 6. The outputs of the reverse counter are connected to the code inputs of the converter 11, the clock input of which is connected to the output of the first UDM 3, and the input of the reference frequency with the output of the second generator 2 of the reference frequency. The output of the PCC 11 is the output of the frequency-pulse functional generator.

The drawing also shows one example of a code converter, a frequency that contains | a subtracting counter 15 with a preset, element 16, a frequency divider 17, and trigger 18. An input for enabling a preset of a subtracting counter 15, which is an input of the clock frequency of the control panel Iί, is connected to the input of the unit in trigger unit 18 and to the output of the first UCH 3. Subtracting preset inputs the counter 15, which are the code inputs of the PCC 11, are connected to the outputs of the reverse counter 10. The transfer output of the subtracting counter 15 is connected to the zero input of the trigger 18, the output of which is connected to one of the inputs of the And 16. element. Another input of the element And 16, which is the input of the reference frequency PCC 11, is connected to the output of the first generator 2 of the reference frequency, and the output is subtracting the input of the counter 15 and the input of the frequency divider 17. The output of the frequency divider 17 is the output of the PCC 11 and the output of the frequency-pulse functional generator as a whole.

The device operates as follows.

Before starting work, the generator is programmed. The given function is analyzed and its piecewise linear approximation is performed. The switches of the block 13 switches UDM 3 and 6 and block 7 of the switches are installed in positions that provide reproduction of the approximating function. The initial value of the function is set using the dial 9 initial values, which can also be made in the form of a block of switches.

At the time of the start of the program (power on) in the reverse counter 10 is written the number specified by the dial 9 initial values. Pulses with a repetition rate f _t come from the output of the generator 1 of the reference frequency to the inputs of the UDF 3 and 6 and to the input of the counter 4. The counter 4 using the decoder 5 generates signals (sections of the time axis of the reproduced function), which are received on the AND-OR 14 elements, UDC 3 and 6, as well as through block 7 of the switches to the inputs of the OR element 8. The clock frequency of the converter 11, which determines the scale along the f axis of the reproduced function, is selected at each time section using UDC 3 in accordance with the program specified by the position of the switches block 13 switches. The frequency divider 12, at the input of which the frequency arrives, forms a set of frequencies f at the outputs. = f · / K ,, (K is the division coefficient of the divider 12), which, through the switches of the -13 switch block, allowing you to select any of the frequencies on each of the sections of the time axis, are received. The inputs of the AND-OR element 14. With the arrival of the enable signal corresponding to the plot of the time axis, from the output of the decoder 5, the selected frequency f "enters through the AND-OR 14 elements to the clock input of the converter I 1.

Similarly, UDC 6 generates at the output for each section of the time axis a frequency defining the slope of the reproduced function, which is fed to the counting input of the reverse counter 10.

The control signal of the direction of the account, arriving at the control input of the direction of the account of the reverse counter 10 from the output of the OR element 8, is formed from the output signals of the decoder 5 coming through block 7 of the switches to the inputs of the OR element 8.

At the outputs of the reversible counter 10, a sequence of codes is formed that displays the type of the approximating function. The number originally recorded in the reversible counter sets the initial value of the approximating function. The sequence of codes is supplied to the code inputs of the converter 11.

The input of the reference frequency of the Converter 11 receives pulses with a frequency f _3J from the output of the generator 2 of the reference frequency, the clock input receives pulses with a frequency f _τ from the output of the UDF 3.

The Converter 11 converts the number N, given by the code at its inputs, into the repetition rate of the output pulses F _v in accordance with the formula

F = K · N · f OUT pr ¹⁴ Sokt 'where K _pr - conversion coefficient of the converter 11.

The dependence of the output frequency of the Converter 11 on time F & = f (t) approximates a given function.

The purpose of the Converter 11 begins when a pulse is received at the clock input. This pulse sets the trigger 18 to one and writes to the subtractive counter 15 the number N specified by the code. at the inputs of the converter 11. The output signal of the trigger 18 opens the And 16 element and through it pulses with a frequency f begin to arrive at the subtracting input of the counter 15 and at the input of the frequency divider 17. Each pulse decreases the contents of counter 15 by one. When N pulses pass through element 16, the contents of counter 1.5 become zero and a pulse appears at the transfer output, which sets trigger 18 to zero. In this case, the output signal of the trigger 18 will block the passage of pulses through the element And 16. With the arrival of the next clock pulse, the converter cycle is repeated. A frequency divider 17 performs frequency division with a coefficient K, thereby reducing the unevenness of the output frequency. The dependence of the output frequency of the Converter 11 on the number N specified by the code at its inputs is described by the formula

F = K · N G

6TH. % R ^P tact 'where K = 1 / K is the conversion coefficient.

In this case, the relation f <f / N _u ,

Tokt jt Max ’where N is the maximum transformable max number.

Claims (1)

The invention relates to a pulse technique and can be used to test and adjust information-measuring systems and automation systems, working with frequency sensors. The aim of the invention is to expand the functionality of the generator by reproducing functions with alternating derivative and with gaps and improving the accuracy of approximation of a given function. The drawing shows the functional diagram of the frequency-pulse function generator. The device contains the generators 1 and 2 of the reference frequency, the first controlled frequency divider (UDCH) 3, 4 counters of the pulses, the decoder 5, the second controlled frequency divider (UDCH) 6, the block 7 switches, the element OR 8, the setpoint generator 9 initial values, reversible counter 10 and the converter code 11 - frequency (FSC). Each of the controlled frequency dividers (UDCH) 3 and 6 contains a frequency divider 12, the input of which is the UDCH input, and the outputs through the switch block 13 are connected to the first inputs of the AND-OR element 14, the output of which is the UHF output. The second inputs of the I-IPI 14 element, which are the UDCH inputs, are connected to the outputs of the decoder 5, the inputs of which are connected to the outputs of counter 4. The inputs of controlled frequency dividers 3 and 6 and the input of counter 4 are connected to the output of the first generator 1 of the reference frequency. The input of the presetting of the reversible counter 10 is connected to the setpoint outputs of the 9 initial values, the control input to the counting direction is connected to the output of the 1ENT cell OR 8, the counting input is connected to the output of the second UDCH b. The outputs of the reversible counter .10 are connected to the code inputs of the converter 11, the clock input of which is connected to the output of the first UDCH 3 and the input of the reference frequency to the output of the second generator 2 of the reference Frequency. The FCP 1I output is the output of a pulse frequency function generator. The drawing also shows one example of the implementation of the code-frequency converter 11, which contains the subtracting counter 15 with the preset, AND 16, the frequency divider 17 and the trigger 18. The preset resolution enable input of the subtracting counter 15, which is input of the clock frequency PCh 1i, is connected to the installation input to the trigger unit 18 and with the output of the first UDCH 3. The inputs of the preset of the subtracting counter 15, which are the code inputs of the NF 11, are connected to the outputs of the reversing counter 10. The transfer output of the subtractive counter 15 is connected to the input setting zero of the trigger 18, the output of which is connected to one of the inputs of the element 16. The other input of the element 16, is the input of the reference frequency FSC 11, is connected to the output of the first generator 2 of the reference hour counter 15 and the input of the frequency divider 17. The output of the frequency divider 17 is the output of the FPCH 11 and the output of the frequency-pulse function generator as a whole. The device works as follows. Before starting, the generator is programmed. The given function is analyzed and its piecewise linear approximation is produced. The switches of the block 13 of the UDCH switches 3 and 6 and the block of the switches 7 are set to 1 position, ensuring the reproduction of the approximating function. The initial value of the function is set with the help of the initial value setter 9, which can also be made as a block of switches. At the time the program starts (power on), the number specified by the setpoint controller 9 is recorded in the reversible counter 10. Pulses with the following frequency f are received from the output of the generator 1 of the reference frequency to the inputs of the UDCH 3 and 6 and to the input of the counter 4. Counter 4 using the decoder 5 generates signals (portions of the time axis of the reproduced function) that go to the I-SHSh 14, UDCH elements 3 and 6, as well as through the block 7 of switches to the inputs of the element OR 8, the clock frequency of the converter 11, which determines the scale along the axis of the f function, is selected at each time segment by means of the UDCH 3 in accordance with with the program given by the position of the switch block 13 switches. Frequency divider 12, to the input of which frequency f. Arrives, generates a set of frequencies f, f at the outputs. / Кр (к is the division factor of divider 12), which through the switches of the -13 switch unit, allowing you to select any of the frequencies f: at each of the sections of the time axis, arrive at the inputs of the I-CHI element 14. With the arrival of the enabling signal corresponding to to the section of the time axis, from the output of the decoder 5, the selected frequency fj goes through the elements of I-ШШ 14 to the clock input of the converter I1. Similarly, the UDCH 6 generates at the output for each section of the time axis the frequency f determining the slope of the reproduced function, which is fed to the count input of the reversible counter 10. The count direction control signal arrives at the count direction control input of the reverse counter 10 from the output of the OR 8 element formed from the output signals of the decoder 5, coming through the block 7 of the switches to the inputs of the element OR 8. At the outputs of the reversible counter 10, a sequence of codes representing the approximation type is formed Ymir function. The number originally recorded in the reversible counter sets the initial value of the approximation function. The sequence of codes is supplied to the code inputs of converter 11. To the input of the reference frequency of the converter. 1 1 receives pulses with frequency f from the generator 2 output of the reference frequency, pulses with frequency f from the UDCH output go to the clock input. Converter 11 converts the number N specified by the code at its inputs to the frequency of the output pulses F "in accordance with form F To Nf OUT lr-SoKT where is the conversion coefficient of converter 11. The dependence of the output frequency of converter II on time F f (t) approximates the given function. The purpose of operation of the converter 11 begins when a pulse arrives at the clock input. This pulse sets the trigger 18 to one and writes the number N specified by the code into the subtracting counter 15. at the inputs of the converter 11. The output signal of the trigger 18 opens the element AND 16 and through it the pulses with the frequency f .. begin to flow to the subtracting input of the counter 15 and to the input of the frequency divider 17. The Calts pulse reduces the content of the counter 15 by one. When N pulses pass through the element 16, the contents of the counter 1.5 become equal to zero and at the output, the transfer of the pulse that sets the trigger 18 to the zero state. At the same time, the variable code of the trigger 18 will block the passage of pulses through the element 16. With the arrival of the next clock pulse, the operation cycle of the converter is repeated. A frequency divider 17 performs frequency division by a factor K, thereby reducing the unevenness of the output frequency. The dependence of the output frequency of converter 1 on the number N, given by the code at its inputs, is described by its formula. where K 1 / K is the conversion factor. In this case, the ratio f f / N Talt t Max should be observed where N is the maximum convertible number. The formula shows a pulse frequency function generator, containing two reference frequency generators, a decoder, a master of X values, a controlled frequency divider, which consists of a frequency divider whose input, which is the input of a controlled frequency divider, is connected with the output of the first generator of the reference frequency, and the outputs through the switch block are connected to the first inputs of the multi-input element AND-OR, the output of which is the output of the controlled time divider, and the second inputs of the multi-input input elements that are the control inputs of a controlled frequency divider,. connected to the outputs of the decoder, and a pulse counter, the input of which is connected to the output of the first generator of the reference frequency, and the outputs are connected to the inputs of the decoder, characterized in that, in order to expand the functionality and accuracy of the approximation of a given function, an additional switch block, an OR element, a reversible counter with a preset, a frequency converter and a second controlled frequency divider, the input of which is connected to the output of the first reference frequency generator, the control inputs are connected to the outputs decoder and through series-connected additional switch block and the OR element - to the control inputs of the counting direction of the reversible counter, the counting input of which is connected to the output of the second controlled frequency divider, the preset inputs of the reversible counter are connected to the outputs of the initial value setter, and the outputs are connected to the code inputs of the converter code - the frequency of the clock input which is connected to the output the first controlled frequency divider, the reference frequency input of the code-frequency converter is connected to the output of the second reference frequency generator, the output of the code-h converter Astro is the output of a pulse frequency function generator;