SU1120363A1 - Function generator - Google Patents

Abstract

FUNCTIONAL GENERATOR containing the first and second registers connected by information inputs to the input bus of codes for the nodal values of the function, and outputs to the inputs of the first and second digital-to-analog converters, respectively, the outputs of which are connected to the first and second inputs of the first decoding resistor matrix, respectively, connected by each iM) an output to the i-th signal input of the first switchboard, connected by control inputs to the outputs of the bits of the reversible counter, connected by the output of the indication of Zero to the recording control input of the second register and the input of the OR element, and the output of the overflow feature to the recording control input of the first register and the second input of the OR element, the output of which is the output of the function generator initiation signal and connected to the recording control input of the third register connected by the information input to the input code of the length of the section, and the output to the input of the controlled pulse generator, characterized in that, in order to improve the accuracy of reproducibility of the functions, A second resistor decoding matrix, second and third switches, a controlled switch and a frequency divider connected by output to the input of the reversible counter, and input to the output of the controlled pulse generator and the controlling input of the third switch, whose output is the output of the function generator, are entered and the signal inputs are connected to the outputs of the second decoding resistor matrix connected by the first and second inputs to the outputs of a controllable switch connected by control inputs to moves of zeroing and overflowing the reversible counter, and signal inputs to the outputs of the first and second switches, the first switch connected to the (n + 1) signal input with the output of the second D / A converter, and the second switch connected to the control inputs to the outputs of the reversing bits counter, the first signal input to the output of the first digital-to-analog converter, and each iM

Description

111

The invention relates to automation and computer technology and can be used, in particular, in hybrid computing and control systems for reproducing functions set by codes of nodal values of ordinates and dpin approximation areas, and the most appropriate is the use of the invention in automatic control systems for testing for static strength and creep of samples of materials and elements of mechanical structures (in particular, aeronautical), where high accuracy is required for specifying the load And to: maintain their stability during a long time and {(chasg, day months particle).

Known functional generator containing registers, digital-to-analog converters, a pulse generator, a counter, and the elements of the settings;

The disadvantage of the functional generator is the reduced accuracy of reproduction of functions due to the piecewise-stepwise nature of working out the approximation areas and the uniform character of the division into separate approximation areas.

Also known is a function generator, a pulse generator, a binary counter, a controlled-bit counter, a code shift block, digital-to-analog converters, and a signal shaping unit AND P1CIACI11.

The disadvantage of the generator is the complexity of the technical implementation with increased requirements for accuracy

 reproduction functions.

 The closest to the invention is a functional generator containing the first and second registers connected by information inputs: to the input pin of codes for the nodal values of the function, and the outputs to the inputs of the first and second digital-to-analog converters, respectively, whose inputs are connected to the first and second inputs a decoding resistor matrix connected by each (, where n is the number of matrix outputs) output to the i-th signal input of the first switch connected by the control inputs with the output Ii of the rotates Counter counter. Outputs of signs of zeroing and overflow of a counter up to 32

yen (using the OR element) to the general overflow output of the counter, WITHOUT also the output of the function generator initiation signal and connected to the control input of the third register, connected by an information input to the entry code for the length of the section, and the output to the input of the controlled pulse generator. The control inputs of the recording of the first and second registers for the case of approximation of the function at each section by the same type of dependence, for example, a segment of a straight line, are connected to the outputs indicating zeroing and overflow of the reversible counter, respectively. The input, the counter, is connected to the taps of the controlled generator, and the input buses of the codes of nodal values of ordinates and lengths of sections through the corresponding buffer registers are connected to the jj -direct output of the control unit (microprocessor) 5 whose input is connected to the output of the initiating signal fsj,

A disadvantage of the known arrangement is that the accuracy of the function of generating functions due to the piecewise-step-like nature of mining in the area of approximation is reduced.

The purpose of the invention is to improve the accuracy of reproducibility of functions.

The goal is achieved by the fact that in the functional generator there are first and second registers connected by informational inputs to the input bus of codes of specific function values, and the outputs to the inputs of the first and second digital-analogue converters of the correspondingly, the outputs of which are connected to the first and third inputs of the first decoding sharp converter matrices, respectively, connected with each i-th () output to the i-th signal input of the first switch connected to the control-i inputs with the outputs of the reversing back bits of the sensor connected to the output of the zero sign to the control input of the second register and the input of the LHS element, and on the overflow of the overflow symptom to the recording control input of the first register and the second-g, the input of the MI element, whose output is the output of the func tional generator initiation signal to connected to a control input

A third register connected by an information input to a section length code input bus, and an output 1k to the input of a controlled pulse generator, entered a second decoding resistor matrix, a second and third switches, a controlled switch and a frequency divider connected by an output to the input of a reversible counter, and an input - with the output of the controlled pulse generator and the control input of the third switch, the output of which is the output of the function generator, and the signal inputs are connected to the outputs of the second a coding resistor matrix connected by the first and second inputs to the outputs of a controlled switch 5 connected by control inputs to the outputs of zeroing and overflow signs of the reversible counter, and the signal inputs of the reversing counter to the outputs of the first and second switches, and the first switch is connected (n + 1 ) is the signal input from the output of the second digital-to-analog converter, and the second switch is connected by control inputs to the outputs of the bits of the reversible counter, the first signal input to the output of the first digital the log converter, and each i-th (26iin + 1) signal input - to (1-1) -th output of the first decoding resistor matrix. The drawing shows a block diagram of the proposed functional generator. The device contains the first and second registers 1 and 2, connected by the information inputs to the bus 3 for inputting the codes of the nodal values of the function and the outputs to the inputs of the first and second digital-to-analog converters 4 and 5, respectively. The outputs of converters 4 and 5 are connected to the inputs of the first decoding resistor matrix 6 connected by i-M (where n is the number of matrix outputs) by the output to the i-th signal input of the first switch 7,

connected by control inputs with outputs of the bits of the reversible counter 8. Counter B is connected to the control input of the second register 2 and the input of the element OR 9 and the output of the overflow sign to the input of the control of the first register 1 and second; To the input of the element 11ЛЙ 9..The output of the element OR 9 is the output 10 of the initiation signal and is connected to the input of the recording control of the third register 11 connected by the information input to the bus 12 for entering the section length code, and the output to the input of the controlled oscillator 13 a frequency divider connected to the control box by the input to the input of the generator 13, and a signal input to the frequency reference bus. Reversible counter 8 contains the actual counter, the decoders for zeroing signs | and overflow and reverse trigger. SoVo The frequency divider 14 is connected by an output to an input of a reversible counter 8, and an input to an output of a generator 13 and a control input of a third switch 15, the output of which is the code of a function generator. The signal inputs of the switch 15 are connected to the outputs of the second decoding resistor matrix 16 ,. connected to the first and second inputs with the outputs of the controlled switch 17. The latter is connected to the control-P1 inputs to the outputs of the signs of zeroing and overflow of the count 8, and the signal; -sh inputs to the outputs of the first and second switches 7 and 18. The first switch 7 is connected to (n + 1) -m signal input with the output of the second digital-to-analog converter 5. The second switch 18 sub-i switch is n control inputs to the bits of counter 8, the first signal input to the output of the first digital-analog converter 4, and every i-th (2 -i $ iH-1) with the rotary input is to (il) -My the output of the first resistor matrix 6. Each of the resistor matrices 6 and 16 can be made as a chain of series-connected resistors, the first output of the first and second output of the last of which are inputs of the matrix, and the connection points of all resistors with one another - the outputs of the matrix (the outputs of the matrix 16 are also its inputs). The control switch 17 can be executed by pa of two pairs of keys, connected by control inputs To the corresponding output of the trigger, the setting inputs of which are the control inputs j. switch 17. The controlled oscillator 13 can be performed on the oscillator operates as follows. Before starting, the registers i, 2 and 11 and the counter 8 are zeroed. The signal from the output of the counter zero reset sign. 8 goes to the control inputs of registers 2 and 11 and output 10 of the initiator 11–5 allows writing the end (nodal) point code to register 2. the first plot of the approximation, and the 1I register is the length code of the P 5rvo. Approximation section "On the Start signal (the circuits during the descent of the gz nodes, the initial state and the start of the function generator are not shown in the drawing); the generator (5p 13, pulse frequency | on the output of which register code 11 counts. Counter 8 counts the pulses passing through frequency divider 14, and forwards linearly increasing from zero to the maximum value the sweep code of the first approximation area arriving at the control inputs of the switches and 18. The signal inputs of the switches 7 and 18 connect the outputs matrix 6, and converters 4 and 5 in such a way that for each state of the counter 8 to the first switch of the switch 18, the first output of one of the 6 5 matrix resistors is connected to the switch 7, the second output of the same register from the chain in series of the resistors of the matrix 6, In the zero state of the counter 8, when the output of the switches 7 and 18 is connected to their first signal inputs, voltage. at the output of the switch 18 is equal to the output. The voltage of the converter 4 (i.e. corresponds to the ordinate of the starting point of the first approximation section) 5 at the output of the co-capacitor 7 differs from that of the switch 18 by the voltage drop of the first resistor of the matrix b connected first & 1 output to the converter output. 4, As the code of the counter 8 increases, the switches 7 and 18 switch in such a way that their output voltages constantly approach the output voltage of the converter 5, and each time overshoot the difference The voltages between the codes of the switches 18 and 7 become equal to the voltage drop of the resistors of the matrix and the ENI code of the counter reaches its maximum value J when the outputs of the switches 18 and 7 are connected to their (i + 1) -e signal inputs, output voltage of the switch 7 becomes equal to the output voltage of the converter 5 (i.e. corresponds to the ordinate of the end point of the first region approximation and), and the output voltage of the switch 18 differs from it by the value of the voltage drop at the last resistor of the chain after matrix 6, the output voltages of the switches 7 and 18 through the controlled switch 17 are fed to the inputs of the matrix 16, during operation, after the switching of switches 7 and 18 to a new state, the control input of the commentator 15 is after a series of pulses , the number of which is equal to the division factor of the 14 frequency divider. These pulses successively change the state of KONiMyTaTopa 15, as a result of which its output is alternately connected to the resistor terminals of the matrix 16, starting with the first output of the first resistor pa (ie, the first input of the matrix 16) and ending with the second output of the last resistor of the chain of subsequently connected resistors of the matrix 16 (i.e., from the second input of the matrix 16). After the next change in the state of the counter 8 and the commutators 7 and 18, the next series of impulses comes to the control of the k-th input k1 -.- {mutator 15, switching its inputs in the same way. In this case, the output voltage of the com1-.1 switch 15, which is the output voltage of the functional 5; about the generator, each time varies stepwise from the switch 18 to the output voltage of the 1st switch of the switch 7, and the number of stages is determined by the division ratio of the frequency divider 14. When the counter code 8 reaches its maximum value and forms voltage at the output of switch 7, corresponding to the ordinate of the end point of the first section of the approximation, the matrix 16 and switch 15 work out the last one. series of steps of the first approximation area. After the commutator 15 of the last pulse 71 of the current pulse series arrives at the control input, the voltage at the output of this switch corresponds to the ordinate of the end point of the first section of the approximation (register code 2). When the counter 8 reaches the maximum value, the signal from the output of the overflow indicator of the counter 8 transfers it to the pulse subtraction mode and enters the control inputs of registers 1 and 11 and output 10 of initiation, allowing the endpoint codes and the duration of the second segment to write to registers 1 and 1 approximations. Further, the functional generator operates similarly with the only difference that as the contents of the counter 8 decrease, the switches 7 and 18 switch the outputs of the matrix 6 to the reverse 20

On their own order, a voltage is formed in its voltage codes that jumps from the output voltage of the converter 5 to the output voltage of the converter 4. Since the switching direction of the switch 15 does not change, the transition from working out the second approximation section results in a signal from the output a sign of overflow counter 8 translates 30

the switch 17 is in such a state that the first input of the matrix 16 is connected to the output of the switch 7, and the second input to the output of the switch 18. As a result, the voltage at the output of the function generator begins to change stepwise from the voltage level at the output of the known device (at that the same section of the function) in a number of times equal to the division factor of the frequency divider. 14, which determines the increase in the accuracy of generating the specified functions. The switch time of the keys is 10 times less than the time it takes to generate one step of the program, therefore the bursts are output by the device circuit.

These advantages allow the use of the proposed functional generator for setting very slow loading programs that require high stability and accuracy in their generation. 3 n, corresponding to the ordinate of the end point of the first segment of the approximation (register code 2), to the level corresponding to the ordinate of the end point of the second segment (register code 1). The transition to testing the next third section, reversing the counter 8, and changing the state of the switch 17 is performed at the time of completing the second section, according to a signal from the output of the zero sign of the counter 8, and so on. Thus, over the time interval between every two adjacent switches of switches 7 and 18, the change in the output voltage of the voltage prbdl. function generator has a stepped nature, the amplitude of each step of which is less than the amplitude of the step-like change of the generator signal is easy to filter

Claims (1)

FUNCTIONAL GENERATOR, containing the first and second registers connected by information inputs to the input bus codes of the node values of the function, and the outputs to the inputs of the first and second digital-analog converters, respectively, the outputs of which are connected to the first and second inputs of the first decoding resistor matrix, respectively connected by each i- m (1 £ i4n) with an output to the 1st signal input of the first commutator, connected by control inputs to the outputs of the bits of the reversible counter, connected by the output of the sign input to the control input of the second register and the input of the OR element, and the output of the overflow sign to the input of the write control of the first register and the second input of the OR element, the output of which is the output of the function generator initiation signal and is connected to the write control input of the third register connected to the information input to the bus for entering the code for the duration of the section, and the output to the input of a controlled pulse generator, characterized in that, in order to increase the accuracy of reproducibility of functions, a second a decoding resistor matrix, second and third switches, a controlled switch and a frequency divider connected by an output to the input of a reversible counter, and by an input to the output of a controlled pulse generator and a control input of a third switch, the output of which is the output of the functional generator, and the signal the inputs are connected to the outputs of the second decoding resonator matrix connected by the first and second inputs to the outputs of the controlled switch connected by the control inputs to the outputs zeroing and overflow of the reverse counter, and signal inputs - to the outputs of the first and second switches, the first switch connected to the (n + 1) -th signal input with the output of the second digital-to-analog converter, and the second switch connected by control inputs to the outputs of the bits of the reverse counter, the first signal input - to the output of the first digital-to-analog converter, and each i-th (2 ^ · ίέη + 1) signal input - to the; (£ -1) -th output of the first decoding resistor matrix. "And * No. О СО о со