G - Physics
01
V
349/16
G01V 1/28 (2006.01) G01V 1/20 (2006.01) G01V 1/36 (2006.01)
Patent
CA 1128189
FIELD FAN FILTER ABSTRACT Apparatus for fan filtering seismic data in the field comprising inputs for receiving signals from each seismometer in a group, summing amplifiers for summing the received signals by pairs, charge-coupled device delay lines for providing two different delays to each of the summed pairs, amplifiers for taking the difference of each of the two delayed signals from each summed pair, and means for weighting and summing the outputs of all pairs. The time delays of each of the charge-coupled device delay lines are proportional to and contolled by a single clock, which can be time-variable. The clock may be held at a single frequency during the taking of a given record, but in the preferred embodiment the clock is varied during recording to provide a narrower pass band of apparent velocities for deeper reflections than for the shallow reflections.
306674
Gowling Lafleur Henderson Llp
Standard Oil Company
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