SU1117661A1 - Logarithmic calculating device - Google Patents

Abstract

LOGARIFMIC COMPUTING DEVICE containing the source of the reference voltage, connected to the information input of the exponential voltage generator, the output of which is connected to the first inputs of the P comparison blocks, the second inputs of which are a group of information inputs of the device, the outputs (n-1) of the comparison blocks are connected to control inputs (r | -1) keys, and the output of the nth comparison block is connected to the start input of the exponential voltage generator, characterized in that, in order to expand the class of tasks Uteem permit calculating the logarithm of the product of the input signals with different degrees of data were obtained, it introduced an output adder having inputs connected to the outputs key information inputs which are the inputs group parameters specifying factors g degrees, the output of the adder output is the output device.

Description

The invention relates to electronic pulse devices and can be used in analog computers and information converters.

A device for logarithmizing electrical signals is known, comprising a clock generator, an exponential voltage generator, a comparator, a key, a constant voltage source, a storage element, and a differential amplifier Ll3,

The disadvantage of the device is low accuracy due to the dependence of the final result on the constant exponential voltage generator.

The closest to the invention is a logarithmic computing device containing a source voltage, connected to the information input of an exponential voltage generator, the output of which is connected to the first inputs of the n comparison units, the second inputs of which are a group of information inputs of the device, the outputs of the comparison blocks are connected to the control inputs (l-1) of the keys, and the output of the h-th comparison unit is connected to the trigger input of the exponential voltage generator L23.

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A disadvantage of the known device is the impossibility of calculating the logarithm of the product of the input signals with different exponents, which limits the scope of application of the device.

The purpose of the invention is to expand the class of tasks to be solved by providing the possibility of the permutation of the logarithm of the product of input signals with various exponents.

The goal is achieved in that a logarithmic computing device containing a reference voltage source connected to the information input of an exponential voltage generator, the output of which is connected to the first inputs and comparison blocks, the second inputs of which are a group of information inputs of the device i outputs (h- 1) comparison blocks are connected to control inputs (h-1) of keys, and the output of the n-th comparison block is connected to the start input of the exponential generator

voltage, input output adder inputs. Which are connected to the outputs of the keys, the information inputs of which are a group of inputs for specifying factors of factors, factors of the output adder. is the output of the device.

The drawing shows a block diagram of a logarithmic computing device.

The logarithmic computing device contains the source 1 of the reference voltage, the generator 2 of the exponential voltage, blocks, comparison, keys to the output adder 5.

The device works as follows.

At the initial moment of time, at the output of the nth block 3 of the comparison, the permissions signal for the generator 2 of the exponential voltage is present, and from its output, the first inputs of all the comparison blocks receive the exponentially falling voltage

-o6t

Uren jo

whereC. voltage at the output of exponential voltage generator 2; UQ is the voltage of the voltage source 1;

cL is the damping constant of generator 2;

t is the current time. Input voltages are supplied to the second inputs of all comparison blocks, and the smallest of the input signals is fed to the second input of the n-th comparison block. As the voltage varies at the output of the generator 2, all input voltages are compared, cUr-eH) P

--i i

where t is the time from the start of the generator 2 to the moment when the voltage L / gatch is compared with the input signal. Until the comparison t, the keys are open and input signals V are fed to the inputs of the adder 5. At the time of comparison, the keys are closed with, and the input signals to the inputs of the adder 5 are not received. At the time of comparing U with the smallest input

a signal appears at the output of the nth block 3 of the comparison, which returns the generator 2 to the initial position, while its output will be the potential UQ, which will lead to a change in the sign of the signal from the output of the hth. the comparison unit permits for generator 2, and then the process is repeated in the same way. The signal at the output of the adder 5 has a stepped form and its average value is equal to

Mon

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H

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The cycle repetition period is equal to the time interval from the beginning of the cycle to the moment of equality UnH and - (Jn; i, is the time during which

Key 4 is open, Vj is the signal that arrives at

. entrances The output voltage of the device does not depend on the constant damping of the exponential voltage generator. .

The economic effect of the proposed logarithmic computing device is determined by its use in instrument making due to its versatility.

Claims (1)

A LOGARITHMIC COMPUTER, containing a reference voltage source connected to the information input of an exponential voltage generator, the output of which is connected to the first inputs rt of the comparison blocks, the second inputs of which are a group of information inputs of the device, the outputs (p-1) of the comparison blocks are connected to the control inputs (ή-1) keys, and the output of the ηth comparison unit is connected to the start input of the exponential voltage generator, characterized in that, in order to expand the class of problems to be solved by Sintered possibilities for computing the logarithm of a product of input signals with different exponents, it introduced an output adder having inputs connected to the outputs of keys, data inputs of which are a group of indicators reference inputs § degrees multipliers, the output of the adder output is the output device. Q