SU788346A1 - Low-pass filter for pulse signals - Google Patents

Description

(54) LOWER FREQUENCY FILTER FOR PULSE SIGNALS

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The invention relates to radio engineering and can be used in various radio engineering systems.

A low-pass filter for pulsed signals is known, comprising a delay line and an AND 1 element.

However, the known filter has a low frequency stability at the filter attenuation boundary.

The purpose of the invention is to increase the stability of the cutoff frequency.

To achieve the goal, two triggers and a serially connected clock generator, an additional And element and a pulse counter, the output of which is connected to the first setup inputs of the trigger, the output of the first of which is connected to the second input of the additional element is And, and the output of the second is connected to the first input of the element And, and the installation input of the pulse counter, the second input of the element And and the input of the delay line are combined in are input devices, and output of the delay line is connected to a second adjusting input triggers.

The drawing shows the structural electrical circuit of the proposed filter.

The low-pass filter contains a generator 1 clock pulses, the element And 2, the counter 3 pulses., Line 4 delay, triggers 5 and 6, an additional element And 7.

The device works as follows.

In the initial state, the AND 2 element is closed and the input signal is not fed to the filter output. The first impulse of the input signal is fed to the setup inputs of the corresponding triggers of the counter of 3 pulses to introduce an addition to it, which determines the cutoff frequency limit of the filter. In this case, the control trigger 5, with a delay equal to the delay time of the delay line 4, goes to another steady state, and the trigger 6 confirms its state. Element And 7 opens, and Element 20 And 2 remains closed. Through the element And 7 is fed to the input of the counter 3 pulses, the signals of the clock pulses from the generator 1 clock pulses. The pulse counter 3 is filled and sets the time interval

Claims (1)

Claim A low-pass filter for pulse signals containing a delay line and an element And, characterized in that, in order to improve the stability of the cut-off frequency, two triggers and a serially connected clock generator, an additional element And pulse counter, whose output is connected to the first installation inputs the flip-flops, the output of the first of which is connected to the second input of the additional element I, and the output of the second is connected to the first input of the element I, the setting input of the pulse counter, the second input The AND gate and the input of the delay line are combined and are the device input, and the output of the delay line is connected to the second trigger inputs of the trigger.