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Time-Notch Filtering

1970; Institute of Electrical and Electronics Engineers; Volume: EMC-12; Issue: 2 Linguagem: Inglês

10.1109/temc.1970.303038

1558-187X

Albert A. Smith, Walter Tuchman,

Geophysics and Sensor Technology

A method is described for measuring low-level time-truncated signals by using narrow-bandwidth synchronous time-notch filters. These filter systems, intended for use with ordinary narrowband receivers or field intensity meters, provide a means of isolating time-truncated signals of interest from adjacent interfering signals. In addition, the important property of near optimum sensitivity (approaching that of a matched filter) is discussed, and the laboratory results of a low-frequency time-notch filter covering the 500-Hz to 2-MHz range are given.