SU413501A1 - - Google Patents

Description

one

The invention relates to hybrid computing devices, in particular, to digital-analogue function generators with piecewise quadratic stage approximation, and can be used in digital-analogue computing.

A function generator is known, which contains a memory device of digital ordinates of the generated function, a control circuit of two decipherors and a trigger, as well as a line-step voltage shaping device consisting of two registers, two code-voltage converters, matching amplifiers, a reversible counter and an output converter code - voltage.

However, in such a generator implementing a piecewise linearly stepwise function approximation, there is a relatively large KOJUI number of split intervals into which the reproducible function is approximated (by segments), and therefore a relatively large amount of input information is required, specified as values of ordinates. reproducible function to achieve a predetermined reproduction of this function, especially if the latter has a sufficiently large number of extrema in the reproduction interval.

The proposed generator provides higher accuracy of reproduction of the generated functions by implementing piecewise quadrate-step-like approximation.

The function generator contains a memory device (memory) with output registers, a trigger is controlled, the inputs of which are connected to the corresponding outputs of two decoders, and the outputs are connected to the inputs of the memory and

reversible counter, the counting input of which is connected to the output of the pulse generator, to the inputs of the detectors and digital inputs of the output code-voltage converter, the analog inputs of which are connected through the terminating amplifiers to the outputs of two intermediate code-voltage transducers.

In addition, code-voltage converters, reversible counters, matching amplifiers and output memory registers have been added to it. In this case, the inputs of the additional converters code - voltage is connected to the corresponding registers of the charger, and the outputs through the matching amplifiers -

To analog inputs of intermediate converters, the code is a voltage, to the digital inputs of which are connected the outputs of additional reversible counters, the counting inputs of which are connected to the output of the pulse generator, and the inputs of the control of the reverse, with cooTBCTCTByioutHMH control trigger outputs.

The block diagram of the function generator is shown in the drawing.

In the generator, the outputs of the digital ordinate memory 1 and the curvature coefficients of the generated function are connected via registers 2-5 to the corresponding digital inputs of converters 6–9 code - voltage, outputs of converters 6 and 7 through matching amplifiers 10 and 11 - to analog inputs of converter 12 the code is voltage, and the outputs of blocks 8 and 9 through matching amplifiers 13 and 14 - with analog inputs of the converter 15, the code - voltage.

The outputs of the converters 12 and 15 through the matching amplifiers 16 and 17 iodl ochey to the analog inputs of the output transducer 18 code - for par, the digital inputs of this converter to the corresponding outputs of the reversing counter 19 and the inputs of the decoders 20 and 21, and the outputs of the latter to the corresponding installation inputs trigger 22.

The outputs of the trigger 22 are connected to the corresponding inputs of the device 1 and reversible counters 19, 23 and 24, the counting inputs of the counters 19, 23, 24 - to the corresponding outputs of the generator 25 clock pulses.

In the initial state, the thresher 22 and the triggers of the counters 19, 23, 24 are in the state "O, and the counters themselves are in the summation mode.

In registers 2, 5, ordnat codes of the generated function are given for discrete time points 7о and 7i, and in registers 3, 4 - codes, ironorpl-ural curvature coefficients of the approximated function for discrete time points 7o, T.

According to the Comaid, the Start starts at a wavelength of the reverse counter clock 19, 23, 24 clock pulses from the generator 25. Between the clock pulses arriving at the counting inputs of counters 19, 23, 24, axle1, a time shift occurs to reduce the discreteness and level of the output stage quadratic interference and a decrease in the magnitude of the interference caused by the voltage switching in the converters 12, 15, 18.

As the pulses arrive at the counters 23, 24 and the output of the transducers 12 and 15, linear-step voltages are formed, which through the matching amplifiers 16, 17 are connected to the analog inputs of the transducer 18. On the output of this transducer, a step-square voltage is generated (in the special case step linear linear).

The process of shaping the stingy-square voltage and the output of the converter 18 continues until time TI, when the code in the counter 19 reaches the value 111 ... 1.

At time TI, the decoder 21 outputs a pulse that switches the trigger 22 to the second steady state. The latter switches counters 19, 23, 24 into subtraction modes and issues a command to device 1, which, before the next clock pulse from generator 25, writes to the register 2 of the ordinate code of the approximated function corresponding to time 72, and also writes the coefficient code to register 4 the curvature of the approximated function corresponding to the time TI, and in register 3 - the code of the coefficient of curvature of the approximated function corresponding to the time TZ.

As the clock pulses from the generator 25 arrive, the counters 19, 23, 24 work and subtract, and the output of the converter 18 generates quadrant quadrant until the time at which the code in the counter 19 reaches the value 000 ... 0. At the same time 20 forms the impulse that | sets the state of the “On trigger 22.” The last-. puts the counter 19, 23, 24 into the summation mode and outputs xsmind to the device 1. With this command, the device 1, before receiving the next clock pulse from the generator 25, writes to the register 5 the ordinate code approximation of the function, corresponding to it, its moment of time 7z, n register 3 - code of the curvature coefficient of the approximated function corresponding to time 7z, and in register 4 - the code of curvature coefficient

approximated function corresponding to time 2. Next, the device works in the same way.

Subject invention

The function geerator, the contents of the memory with output registers, the trigger trigger, the inputs of which are connected to the corresponding outputs of two decoders, and the outputs are connected to the inputs of the inverter1, its devices and through a reversible counter, the counting input of which is connected to the output of the generator of pulses, to the inputs of the decoders and digital output inputs

Converter code - voltage, the analog inputs of which, through terminating amplifiers, are connected to the outputs of two intermediate converters. Code - voltage, which means that, in order to improve the accuracy of reproducing the functions, additional transducers are introduced into it. code-voltage, reversible counters, matching usnliteli and output registers of the device, and the inputs of converters converters code - connected to the corresponding memory register registers, and output s soglasuyuschne usnliteli connected through to the analog inputs of the intermediate code converters - voltage to the digital inputs of which are connected the outputs of additional reverse counters, counting inputs of which are connected to the output of the pulse generator and the control inputs are connected to respective reverse outputs the control trigger.

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