Noise-filtered detection of marine seismic signals

Claim 1

A MARINE SEISMIC DETECTOR CABLE FOR RECEIVING SEISMIC WAVES REFLECTED FROM SUBSURFACE HORIZONS COMPRISING: A PLURALITY OF SPACED-APART SUBARRAYS OF DETECTORS LOCATED ALONG SAID CABLE, THE DETECTORS WITHIN EACH SUBARRAY BEING LONGITUDINALLY SPACED FROM ONE ANOTHER DISTANCES SUCH THAT EACH SUBARRAY ACTS AS A HIGH FREQUENCY FILTER ADAPTED TO ATTENUATE HIGH FREQUENCY HORIZONTALLY TRAVELING NOISE WAVES OVER A REJECT BAND, A MAIN DETECTING ARRAY COMPRISED OF SAID SUBARRAYS, SAID MAIN DETECTING ARRAY HAVING AN IMPULSE RESPONSE ACCORDING TO A PREDETERMINED NONUNIFORM WEIGHTING FUNCTION TO PROVIDE A LOW FREQUENCY FILTER FOR PASSING THE REFLECTED WAVES AND FOR ATTENUATING LOW FREQUENCY HORIZONTALLY TRAVELING NOISE WAVES OVER A REJECT BAND WHICH OVERLAPS WITH THE REJECT BANDS OF SAID HIGH FREQUENCY FILTERS, THE NUMBER OF DETECTORS WITHIN EACH SUBARRAY BEING PROPORTIONAL TO THE AMPLITUDE OF SAID NONUNIFORM WEIGHTING FUNCTION, AND MEANS FOR COMBINING THE OUTPUTS OF ALL OF SAID DETECTORS TO PRODUCE A SINGLE SIGNAL REPRESENTATIVE OF THE REFLECTED SEISMIC WAVES AND SUBSTANTIALLY FREE OF HORIZONTALLY TRAVELING NOISE WAVES OF BOTH HIGH AND LOW FREQUENCY.