SU468175A1 - The method of measuring the width of the spectrum of signals - Google Patents

Description

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SAPSET MEASUREMENT WIDTH SPECTRUM

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torus 19 and clock generator 20.

The process of measuring the width of the signal spectrum is as follows.

The processing of the test is performed.

the signal, consisting in that from its response at the input of narrowband path 3, a strobe pulse is generated, normalized in amplitude, but with a variable duration, which depends on the width of the spectrum with & and from the level of the threshold device generating a strobe-pulse.

The signal under study is converted to the output voltage of the narrowband path 3 channels of the signal, which is fed to the threshold device (Schmitt trigger) 11,

producing a strobe pulse, normalized in amplitude, but with a duration determined by the threshold level and width

spectrum of the measured signal. A gate pulse is applied to one of the input (input a) of the coincidence circuit 15, and is also differentiated by a differentiating circuit 12 and a pulse of the differentiating circuit corresponding to the leading edge of a 5-pulse, and a backlight pulse is generated, with the open key 13, it enters the CRT and simultaneously charges with trigger 16, the potential difference of which is fed to the input b of circuit 15. This is the starting point both on the display of the indicator 4 by the backlight pulse and on the coincidence circuit 15, giving permission to pulse counting from generator 10, which generates a controlled-frequency oscillation, i.e. at the origin of the spectrum width.

The processing of the oscillator 1O of the adjustable frequency consists, on the one hand, in converting it into a response in the form of a pulse, which limits the length of the frequency segment to be measured in the analysis band, and on the other, converting it into a sequence of pulses following with a variable oscillation period are adjustable. My generator. This oscillation, passage channel 7-8-9 marker medak, at the output of narrowband path 9 is converted into a narrow pulse. His position on the frequency

The scan axis of a cadicator CRT 4 depends on the tuning frequency of the generator 10. The same pulse is applied to the key 9 and to the corresponding beat, i.e. the next clock cycle after opening the key 13, with the open key 9 arrives at the backlight of the CRT beam of the indicator 4, marking the end of the width of the spectrum. On the other hand, the same impulse resets the trigger 16, fixing the reference end of the spectrum width. At the same time, oscillation from generator 10 is supplied through circuit 14 as a series of narrow pulses to the input of circuit 15.

The output pulses go to the pulse counter of the voltage-code-18 transducer, which converts the pulse sequence into a form convenient for indication on the display 19. Each number of generator 10 pulses, which are placed in the duration of the variable strobe pulse, corresponds to a uniquely determined width of the spectrum, and therefore, indication occurs directly in frequency units.

Subject invention

A method of measuring the width of the spectrum of signals based on the formation of responses of signals during sequential spectral analysis, characterized in that, in order to enable the automation of the measurement process, improve performance and obtain the measurement result directly in units of measured values, the responses of each signal are converted into strobe pulses normalized amplitude with a duration equal to the width of the signal spectrum at a given level, generate a controlled frequency oscillation in a given range Subjected last sequence analysis and converted into response, the rising edge of each strobe pulse form a new gate, and an adjustable frequency response oscillation stop the formation of the strobe pulse is measured and indicate the duration of the last result in frequency units.