FIELD: measurement technology. SUBSTANCE: signal spectrum is restricted from the top by means of a set of lower frequency filter with cut-off frequencies being equal to top frequencies of corresponding bandpass filters. Availability of signals is determined at outputs of bandpass filters by comparing these signals with threshold value and lower frequency filter is chosen with cut-off frequency being equal to top frequency of most high-frequency bandpass filter which has output signal to exceed threshold. Output signals of selected filter is subjected to digitization with sample frequency which is determined by cut-off frequency of the lower frequency filter. EFFECT: improved precision of measurement. 1 dwg
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