Tracking comb filter includes charge-coupled-device delay line and phase-locked loop. Filter removes harmonics of frequency of repetition of welding-current pulses from acoustic-emission signal. Spurious signals reduced almost to fundamental limit.
Tracking Comb Filter Suppresses Welder Harmonics
NASA Tech Briefs ; 16 , 10
1992-10-01
Miscellaneous
No indication
English
NTRS | 1980
|NTRS | 1990
|NTRS | 1980
|NTRS | 1979
|NTRS | 1991
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