SU732910A1 - Device for producing logarithms of frequency signals - Google Patents

Description

The invention relates to the field of electrical functional converters of analog signals and can I be used in analog computers. One of the known devices for logarithmic electrical signals is a clock generator, comparator, exponential voltage generator D-1. This device is characterized by low accuracy of operation. Of the known devices of similar purpose, the closest one to the present invention is a device for logarithmizing frequency signals, containing a master oscillator, the output of which is connected to the first input of the first And element, the output of which is connected to the input of a frequency converter, pulse counter, the outputs of which are connected to the corresponding the inputs of the memory register, the source of the chute signals 2. The disadvantage of this device is the low accuracy of the logarithm of frequency signals, i.e. low accuracy of work. The purpose of the invention is to improve the accuracy of work, i.e. getting closer to the logarithmic law of the functional characteristics of the device. The proposed device differs from the known one in that a step voltage generator, a comparator, an exponential voltage generator, a delay unit, first and second triggers, a differentiating element, second and third And elements, and a pulse frequency adder, the output of which is connected to the input a pulse counter, the output of the source of frequency signals is connected to the input of a stepped non-transmitter, the additional input of which is connected to the output of the second trigger, an additional input of the functional About the frequency converter and the second input of the first element I, the output of the step voltage generator is connected to one input of the comparator, to another input of which the output of the exponential voltage generator is connected, the output of the comparator is connected to the first input of the first trigger, the second input of which is connected to the output of the delay unit whose input is connected to the additional output of the exponential generator and the first input of the second trigger. The second input of which is connected to the auxiliary pulse counter input, the output of the first trigger is connected to the first inputs of the second and third elements I, and through a differentiating element to the second input of the second trigger, the output of the master oscillator is connected to the second input of the second element I, the output of the frequency converter is connected to the second input of the third element And, the output of the second and third element And connected to the corresponding inputs of the frequency pulse adder.

The functional diagram of the proposed device for logarithmizing frequency signals is shown in the drawing, where the exponential voltage generator 1, the comparator 2, the step voltage generator 3, the first and second triggers 4 and 5, the delay block 6, the differentiating element 7, the first, second and third And 8, 9 and 10 elements, a functional frequency pre-fader 11, a master oscillator 12, a memory register 13, a pulse counter 14, a frequency-frequency adder 15, a source of 16 frequency signals.

The device works as follows.

At the initial time, the outputs of the first and second triggers 4 and 5 are set to the voltage corresponding to a logic zero, a certain number is recorded in the pulse counter 14 of the pulses, the 3-stage voltage generator does not generate a voltage, since it is blocked by the second trigger 5 its additional (installation) input.

After an exponential voltage appears at one of the inputs of the comparator 2 and at the same time the video pulse at the input of the delay unit 6 and at the first input of the second trigger 5, the latter switches and at the output of the generator 3

step voltage is formed. At the output of the functional converter 11, a tray of pulses from the master oscillator 12 appears through the first element AND 8.

The voltages at one input of the comparator 2 vary according to the law of a decreasing exponent, and at the second, according to an increasing stepwise law, depending on

frequency source 16 frequency signals.

If the indicated voltages are equal, a pulse is generated at the output of the comparator 2, which switches the first trigger

5 in one state. In this case, the inputs of the frequency-pulse adder 15 begin to receive pulses from the outputs of the second and third elements And 9 and 1O. At the next time point, an impulse delayed relative to the input video impulse appears at the output of delay unit 6. This pulse arrives at the second input of the first trigger 4 and converts it to zero.

condition. The first inputs of the second and third elements And 9 and 10 receive bans on the passage of pulses from the master oscillator 12 and the functional converter 11, and the output

differentiating element 7 a pulse appears. The pulse differentiated by the falling edge simultaneously carries out the transfer of the recorded number from the counter 14 pulses to the register 13

memory, while setting the counter 14 to the initial state, and switching the Second trigger 5 to the zero state.

The total number of pulses

falling to the input of counter 14, taking into account the linear nature of the change in the output signal of the 3-step voltage generator, is proportional to the logarithm of the frequency of the signals from the output

source 16 frequency signals.

In the proposed device, it was possible to improve the accuracy of the reproduction of the mathematical operation of logarithms due to the integration of the pulse-current flow, which varies in time according to hyperbolic law.

Claims (1)

Invention Formula A device for logarithmic frequency signals containing a master oscillator whose output is connected