Mobil Oil Corporation

Robert D Peterson

Wayne A Penner

Gary P Baggett

A cathode ray tube is used for quality control in conjunction with a method and apparatus for monitoring seismic data gathers. As seismic reflection data is acquired, it is displayed on a cathode ray tube and visually monitored to determine whether information channels are to be deleted due to excess noise, improper amplification, etc., prior to recording the acquired data.

Monitor display control

A floating point formatter for changing fixed point serial digital data, such as that received by a seismic data acquisiton system, is disclosed wherein fixed point serial digital data is received and scaled to remove any bias added by preamplification. The scaled data is shifted a predetermined number of bits and a resulting exponent is calculated. The shifted data signal and corresponding exponent are combined and further scaled to permit stacking the data without exceeding the system capacity.

Serial floating point formatter

An electronic circuit is disclosed wherein a two-stage DC offset filter is provided and implemented serially to coincide with serially implemented seismic data gathers. A first stage corrects the offset in a multichannel system due to amplification stages common to all channels. A second stage includes a circuit for determining the DC offset unique to each channel and compensates for each channel automatically and individually.

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Plano, TX, United States of America

Robert D Peterson