SU913417A1 - Device for reproducing variable-in-time coefficient - Google Patents

Description

The invention relates to automation and computer technology and may find application in analog and analog-to-digital computing devices and systems.

A device for reproducing a variable coefficient time, comprising a pulse generator, a frequency divider, a g-group of AND elements, a switch, a program unit, a reversible counter, and a digital-to-analog multiplication unit [1).

The disadvantages of the device are reduced accuracy (due to the uniform partition of time functions into approximation sections) and limited functionality.

A device is also known for reproducing a time-varying coefficient, comprising a pulse generator, a controlled frequency divider, a delay element, a pulse distributor, a memory unit, a register, and a digital-to-analogue block. This device, based on an uneven partition of time functions into approximation sections, has high accuracy and speed [2].

⁵ However, the device is characterized by the complexity of technical implementation due to the need to store in the memory block full-sized codes of the nodal ordinates of the time functions.

Closest to the invention is a device for reproducing a time-variable coefficient, comprising a digital-to-analog multiplication unit, the analog input and output of which are the input and output of the device, a pulse generator connected by the output to the first input of the element And connected by the output to the counting input of the reversible counter and the second input with the output of the code-frequency converter connected by the first group of inputs to the outputs of the bit3 91 dov of the first counter, and by the second group of inputs to the first uppe of the code outputs of the memory block, the sign output of which is connected to the input of the sign trigger, and the address inputs with the outputs of the decoder connected by information inputs to the outputs of the bits of the second counter, connected by the counting input to the output of the highest bit of the first counter, and the output of the sign trigger is connected to the reverse control input a reversible counter connected by the outputs of the discharges to the digital inputs of the digital-to-analog multiplication unit ^ 'the counting input of the first counter is connected to the output of the pulse generator (3] ·

The disadvantages of the known device are the reduced accuracy of reproducing variable coefficients due to the uniform nature of their splitting into approximation sections and the limited class of reproducible coefficients only in time-variable coefficients with zero initial conditions.

The purpose of the invention is improving accuracy and expanding the class of reproducible coefficients.

This goal is achieved by the fact that in the device for reproducing a time-variable coefficient containing a digital-to-analog multiplication unit, the analog input and output of which are the input and output of the device, a pulse generator connected by the output to the first input of the And element connected by the output to the counting input a reverse counter, and the second input - with the output of the code-frequency converter, connected by the first group of inputs to the outputs of the bits of the first counter, and by the second group of inputs - to the first group e of the code outputs of the memory block, the sign output of which is connected to the sign trigger input, and the address inputs are with the outputs of the decoder connected by information inputs to the bit outputs of the second counter connected by the count input to the output of the highest bit of the first counter, and the sign trigger output is connected to the control input reverse (reversible counter, additional (17 4 body trigger, controlled frequency divider and group of AND elements connected by outputs to digital inputs of digital-analog multiplication unit, first the input inputs - with the outputs of the bits of the reversible counter, and the combined second inputs - with the control input of the decoder and with the output of an additional trigger, about the input connected to the output of the senior bit of the second counter, and the second group of code outputs of the memory block is connected to the control inputs of the controlled divider, 5 frequencies connected by the counting input to the output of the pulse generator, and the output to the counting input of the first counter.

₂₀ The drawing shows a block diagram of a device for reproducing a time-variable coefficient.

The apparatus comprises a generator _{25 January} impulsss coupled output to the counting input of a controlled divider 2 frequency and to a first input of AND 3 · Element and 3 is connected the output from the counting input reverb _30-intensity counter 4 and the second input to an output transducer 5 code-frequency connected first a group of inputs to the outputs of the bits of the first counter 6, and a second group of inputs to the first group of code outputs ³⁵ outputs of the memory unit 7. Block 7 is connected by a second group of code outputs to the control inputs of the divider 2, a sign output is connected to the input of the trigger of 8 characters, and address inputs are connected to the outputs of the decoder 9 discharge counter 6, a countable ⁴⁵ whose input is connected to the output of the divider 2. The output latch plate 8 is connected to a thrust reverser control input of the counter 4. The elements and group 11 elements and ⁵⁰ connect the first input E to the outputs of the counter 4 bits, bedinennymi second inputs to the control input of the decoder 9 and to the output of the additional flip-flop 12, and output - with digital inputs ⁵⁵ digital-to-analog block 13 multiplication. The trigger input 12 is connected to the high-order output of the counter 10, and the analog input and output of block 13 are respectively the input 14 and the output 15 of the device. Converter 5 code-frequency can be performed, for example, in the same way as in the known device on a group of elements AND and elements OR.

A device for reproducing a variable over time coefficient works as follows.

Rectangular pulses from the output of generator 1 are recounted in series with a controlled frequency divider 2, counters 6 and 10. Counter 6 participates in a piecewise linear approximation of each section of the partition of a given time function, and counter 10 serves to find the values of the increments of the ordinates of neighboring nodes through a decoder 9 in block 7 approximations. The code-frequency converter 5, controlled by the outputs of the bits of the counter 6 and the first group of code outputs of the memory unit 7, generates a count resolution signal, which is sent to the And 3 element and allows the passage of pulses from the output of the generator 1 to the counting input of the counter 4. By reverse 'of the counter 4 in in case of changing the sign of the slope of the time function section, the sign trigger 8 is controlled by the switch from the sign output of the memory unit 7. The output code of the counter 4 controls through a group of 11 AND elements the transmission coefficient of block 13, which multiplies the generated transmission coefficient by an input signal supplied to input 14. Voltage is supplied from the output of block 13; to the output 15 of the device and, if necessary, can be further smoothed and scaled by switching on an additional operational amplifier at the output of the device.

The number of pulses from the output of the generator 1 to the counting input of the counter 4 through the And 3 element is equal in each approximation section to the numerical value of the increment of the variable coefficient in this section, specified by the code from the first group of code outputs of the memory unit 7.

The device is tuned to a given time function by entering into the memory block 7 the corresponding values of the increments of the nodal ordinates of the time functions, as well as the codes controlling the second group of code outputs, block 7 by the division coefficient of the controlled frequency divider 2 at each approximation section, which allows to obtain an uneven arrangement approximation nodes along the time axis. To set arbitrary initial values of the time function in the device, trigger 8 and group 11 of elements I.

The device automatically sets the initial value of the time function during the first cycle of work. The trigger 12 is controlled by an overflow pulse counter 10.

Before overflow, there is zero at the output of trigger 12, which selects the increment of the ordinates of the time function from the memory unit 7 to the converter 5 from the memory input 7 to the converter 5 so that the counter 4 counts for the first cycle of operation to the specified initial value of the time function. In this case, the group of 11 AND elements is closed, and after the overflow of the counter 10, the trigger 12 switches to a single state and opens the group of 11 And elements, the code of the initial value of the time function from the counter 4 to the digital inputs of block 13. Thus, the second cycle of the device is working. The first cycle can occur, for example, after the entire device returns to its original position.

The advantages of the proposed device compared to the known one are to increase the accuracy of the device due to the uneven arrangement of the approximation nodes along the time axis (with an equal number of approximation nodes) and the expansion of the class of reproducible coefficients due to the reproduction of time-variable coefficients with arbitrary initial conditions. In this case, the multi-bit initial condition is set by the relatively low-bit code of the memory unit 7. These circumstances characterize the technical and economic efficiency of the device.

Claims (1)

Claim A device for reproducing a time-variable coefficient, 7 913 containing a digital-to-analog multiplication unit, the analog input and output of which are the input and output of the device, a pulse generator connected by the output to the first input of the And element connected by the output to the counting input of the reversible counter, and the second input to the output of the code-frequency converter connected the first corpse ι sing inputs to the outputs of the bits of the first counter, and the second group of inputs to the first group of code outputs of the memory block, the sign output of which is connected to the input of the trigger 1 character, and address inputs dy - with the outputs of the decoder connected by information inputs to the outputs of the digits of the second counter, connected by the counting input to the output of the highest digit of the first counter, and the output of the sign trigger is connected to the reverse control input of the reversible counter. characterized in that, in order to improve accuracy and expand the class of reproducible coefficients introduced into it 417 8 '5. additional trigger, controlled frequency divider and group of AND elements connected by outputs to digital inputs of digital-to-analog unit 5 multiplications, the first inputs - with the outputs of the bits of the reversible counter, and the combined second inputs - with the control input of the decoder and with the output of an additional trigger, About the second counter connected to the output of the senior bit, and the second group of code outputs of the memory block is connected to the control inputs of the controlled divider hour 5 tons connected by the counting input to the output of the pulse generator, and the output to the counting input of the first counter.