SU739568A1

SU739568A1 - Device for approximating functions

Info

Publication number: SU739568A1
Application number: SU782592311A
Authority: SU
Inventors: Юрий Александрович Авах; Владимир Константинович Фатин; Адольф Давидович Цагарели
Original assignee: Предприятие П/Я А-1001
Priority date: 1978-03-20
Filing date: 1978-03-20
Publication date: 1980-06-05

Description

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Изобретение относитс к aвtt)мaтикe и вычислительной технике и может быть использовано дл цифроаналоговой аппроксимации произвольных функций.The invention relates to avttt and computer technology and can be used for the digital-analog approximation of arbitrary functions.

Известно устройство дл аппроксимации функций, содержащее генератор импульсов , управл емый делитель частоты, реверсивный счетчик результата, дешифратор и блок пам ти 1.A device for approximating functions is known, comprising a pulse generator, a controlled frequency divider, a reversible result counter, a decoder, and a memory block 1.

Недостатком устройства вл етс низка точность аппроксимации быстромен ющихс функций времени, обусловленна невысоким быстродействием устройства.The drawback of the device is the low accuracy of approximation of the fast-changing functions of time, due to the low speed of the device.

Известен кусочно-линейный функциональный преобразователь, содержащий делитель частоты, счетчик числа участков, дешифратор , регистр пам ти, реверсивный счетчик, элементы ИЛИ и группы элементов И 2.A piecewise linear functional converter is known that contains a frequency divider, a counter for the number of sections, a decoder, a memory register, a reversible counter, OR elements, and a group of elements of AND 2.

Такой функциональный преобразователь обладает высоким быстродействием, однако отличаетс сложностью конструктивной реализации .Such a functional converter has a high speed, however, it is characterized by the complexity of the constructive implementation.

Известно также устройство дл аппроксимации функций, содержащее генератор импульсов , соединенный выходом с управл ющим входом регистра, подключенного информационными входами к первой группеIt is also known a device for approximating functions comprising a pulse generator connected by an output to a control input of a register connected by information inputs to the first group.

ВЫХОДОВ блока пам ти и соединенного выходами с входами выходного цифроаналогового преобразовател и входами блока пам ти 3.The OUTPUTS of the memory unit and the connected outputs with the inputs of the output D / A converter and the inputs of the memory unit 3.

Это устройство обладает высоким быстро действием и простотой, конструктивной реализации , однако отличаетс невысокой точностью аппроксимации, обусловленной равномерным характером разбиени на интервалы аппроксимации аргумента воспроизвоto димых функций.This device has a high speed and simplicity, constructive implementation, however, it is characterized by a low approximation accuracy, due to the uniform nature of the division into approximation intervals of the argument of reproducible functions.

Целью изобретени вл етс повышение точности аппроксимации.The aim of the invention is to improve the accuracy of the approximation.

С этой целью в устройство дл artnpoicсимации функций, содержащее генератор импульсов , блок пам ти, подключенный первой To this end, a device for artnpoix functions simulation, comprising a pulse generator, a memory unit connected first

Claims

15, a group of outputs to the information inputs of the register connected by the outputs to the inputs of the output digital-to-analog converter, a counter, a delay element and a pulse distributor connected by the outputs to the inputs of the memory block and connected by an input through the delay element to the counter over-charging output, the setting inputs of which are connected from the second group of outputs of the memory unit, and the counting input is connected to the output of the pulse generator. The drawing shows a block diagram of the device; The device contains a pulse generator 1 connected by an output to the counting input of counter 2, the overflow output of which is connected to the input of the pulse distributor 4 connected to the inputs of memory 5 through the delay element 3. The first group of outputs of memory 5 is connected to the information inputs of the register 6 connected by the outputs to the inputs of the output digital-to-analog converter 7, and the second group of outputs of the block 5 is connected to the installation inputs of the counter 1. The device for approximating the functions works as follows ohm In memory block 5, the digital ordinates of the approximated function and the increment codes of the argument are pre-recorded. In the initial state, the zero code is written to the register 6 and the output voltage of the digital-to-analog converter 7 is zero, all bits of the counter 2 are set to one (elements of the installation of the device nodes to the initial state are not shown in the drawing). The first pulse from the output of the pulse generator 1 to the counting input of counter 2, as an overflow pulse, passes through the delay element 3 and enters the input of the distributor 4, while the counter 2 is zeroed. The pulse distributor 4, with the arrival of the first pulse at its input, issues a polling signal to the first input of memory 5, as a result of which the increment code of the argument from the second group of outputs of memory 5 through the installation input enters and is stored in Counter 2. The delay time of element 3 is chosen so that the code of the approximation interval enters the installation inputs of counter 2 after the completion of the overflow pulse. At the same time, the ordinate code of the approximated function from the first group of outputs of the memory block 5 is rewritten into register 6. Writing the code in register 6 occurs forcibly, without first zeroing the register. The output of the converter 7 is set to the voltage corresponding to the code recorded in register 6. The approximation interval begins with the arrival of the second pulse from generator 1 to the counting input of counter 2 and ends with the output of the overflow pulse from this counter. During this time, the voltage at the output of the digital-to-analog converter 7 remains constant. The duration of the approximation interval is determined by the increment code of the argument recorded from memory 5 to counter 2. The second overflow pulse, passed through delay element 3, enters distributor 4, which outputs a polling signal to the next memory 5 input. 2, the code of the next increment of the argument is written, and in register 6, the ordinate code of the approximated function is replaced. After replacing the contents of register 6, the output voltage of the D / A converter 7 is set to the voltage corresponding to the new value of the function, and the counter 2 starts counting the next approximation interval. Similarly, the device operates at subsequent approximation intervals, while the increment codes of the argument and the values of the ordinate functions are set as a result of sequential polling signals, to the corresponding inputs of the memory block 5. The advantage of this device compared to the prototype is a higher accuracy of the functions, due to the uneven nature splitting into intervals of approximation of the function argument. Apparatus for approximating functions, comprising a pulse generator, a memory unit connected by a first group of outputs to information inputs of a register connected by outputs to inputs of an output digital-to-analog converter, characterized in that, in order to improve the accuracy of approximation, it has a counter, a delay element and a pulse distributor connected by outputs to the inputs of a memory unit and connected by an input through a delay element to an overflow output of the counter, the installation inputs of which connect with the second group of outputs of the memory block, and the counting input is connected to the output of the pulse generator. Sources of information taken into account in the examination 1. USSR author's certificate number 451989, cl. G 06 F 1/02, 1973.

2. USSR author's certificate for application No. 2472612 / 18-24, cl. G 06 F 15/20 1977 .. ..,,,

3. USSR author's certificate for application number 2492858 / 18-24, cl. G 06 J 3/00, 1977 (prototype).

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