EFFECT OF CHANGING MULTIPLE ARRAY PROCESSOR OUTPUT FILTER BAND WIDTH.
Special rept. no. 18,
UNITED ELECTRODYNAMICS INC PASADENA CALIF
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The MAP summation at the TFSO is particularly affected by noise in the frequencies generated by wind, thunder, and animals or personnel near a seismometer site. In an attempt to decrease this effect, the MAP output filter was changed from a bandwidth of 5.0 - 0.75 cps with 12db per octave slopes to a bandwidth of 3.0 - 0.75 cps, with 24db per octave slope at 3 cps, and a 12db per octave slope at 0.75 cps. Frequency response was obtained by driving all the involved seismometer calibration coils simultaneously. The change in filter characteristics appears to have improved the quality of the MAP trace by eliminating or reducing most of the higher frequency noise. Before and after sequences are shown.