SU1008753A1 - Device for determination of signal ratio logarithm - Google Patents

Abstract

) A DEVICE TO DETERMINE THE SIGNAL RELATION LOGARIFM, containing serially connected code generator and display unit, to the control inputs of which the corresponding clock pulse outputs are connected, in order to improve the accuracy of the calculation, an exponential voltage to frequency converter is inserted into it, a linear voltage converter in a frequency converter and a frequency comparison unit, the pero and second inputs of the device being the inputs of an exponential and linear conversion Voltage-to-frequency drives, whose outputs are connected to the corresponding inputs of the frequency comparison unit, the output of which is connected to the information input of the form code, the third output of the clock pulse generator is connected to the control of the inputs of the exponential and linear transducers and frequency comparison unit.

Description

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OO The invention relates to electrical computing devices and can be used in analog computers. A device for tracking the logarithm of a signal ratio, containing & a neck generator, an exponential change to the voltage, a reference unit, a gene synchronizing dkh pulses, trigger l, is known. A disadvantage of the known device is low accuracy of operation. The closest to the present invention is a device for determining the log ratio of signals containing a code generator, a display unit of the comparison circuit (2) .® The disadvantage of this device is the low accuracy of operation due to the low sensitivity of the comparison circuits. The goal of isophene is to increase the accuracy of the calculation. The goal is achieved by the fact that the device for determining the logarithm of the signal ratio, which contains a sequentially connected code generator and a display unit, to the control inputs of which the corresponding clock generator outputs are connected, introduced an exponential voltage-to-voltage converter frequency and frequency comparison unit, the first and second inputs of the device being the inputs of the exponential and linear voltage to frequency converters, you Which ones are connected to the corresponding inputs of the frequency comparison unit, the output of which is connected to the information input of the code generator, the third output of the clock pulse generator is connected to the control inputs of the linear voltage-to-frequency converters and the frequency comparison unit definitions of the logar of signal mapping. The circuit includes an exponential voltage-to-frequency converter 1, a linear voltage-to-frequency preamplifier 2, block 3, frequency comparison, 4 clock pulse generator, code generator 5, display unit 6, first and second inputs 7 and 8 of the device. A device for determining the logarithm of the signal ratio works as follows. The input voltages of the first and second inputs 7 and 8. The signal from the clock generator 4 to the control inputs of the exponential voltage converter 1 to frequency and linear voltage converter 2 into frequency, converts the input voltages into frequency, respectively by exponential and linear laws. In block 3, the frequency signals are compared. In accordance with the time interval from the beginning of frequency formation in converters 1 to 2 until the frequency coincides, the shaper 5 of the code forms a measurement result that is reproduced by the display unit 6. The absolute measurement error of the resulting time interval when using the time-amplitude method is l4.AU ° a1ShG d-fc de di - the increment of the exponential voltage over time Atoi (J (4;) is the exponentially varying voltage. The relative error is ji 3 Ui (2) de t is a constant exponential voltage, and u is a constant (reference) voltage. At the time of comparison io / r (3) therefore U fi. Irf.) K | - / tJ, e. "When using the proposed yci function to determine the logarithm of the ratio of the signals, the accuracy of the comparison of the frequency signals depends on the absolute value of the frequencies. The magnitude of the frequencies can be chosen sufficiently high and stable over time. Therefore, the minimum value of the frequency difference can be assumed to be constant. In accordance with this, we have K / - / t- / 3 10О87534

In the flpCTTTHne device, the values of the logarithm of the received signals;

Operating error equals measurement error in addition, depending on the reference voltage. Spedova / cT-t U I - in one piece, the proposed device for op I io and Ci-gr (6) S for determining the logarithm of the opgosh in signals

: by comparison with a known device

From comparison (5) and {6 (it follows that it has a higher accuracy for the proposed determination-calculation device.,.

Claims (1)

(57-) A DEVICE FOR DETERMINING A LOGARITHM FOR THE RELATIONSHIP OF SIGNALS, comprising a code generator and an indication unit connected in series, to the control inputs of which the corresponding outputs of the clock generator are connected, which is different. in order to increase the accuracy of the calculation, an exponential voltage to frequency converter, a linear voltage to frequency converter and a frequency comparison unit are introduced into it, the first and second inputs of the device being the inputs of the exponential and linear voltage to frequency converters, the outputs of which are connected to the corresponding inputs frequency comparison unit, the output of which is connected to the information input of the code generator, the third output of the clock generator is connected to the control inputs exponential and linear voltage to frequency converters and a frequency comparison unit.