DC offset filter
AssigneeMobil Oil Corporation
InventorsGary P. Baggett, Robert D. Peterson, Wayne A. Penner
Life of this patent
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Abstract
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.
Claims7
In a multichannel seismic data processing system where analog seismic data signals are converted to digital representations, a two-stage offset filter comprising:
- a first filter stage for consistently removing dc bias due to common amplifiers from digital representations from all channels;
- control means for determining the dc offset present in each digital representation due to individual channel components;
- and
- a second filter stage connected serially to said first filter stage and controlled by said control means for removing said determined dc offset.
In a seismic data processing system, a method of filtering digital seismic data comprising the steps of:
- receiving digital seismic data as digital representations;
- removing a predetermined DC bias from all digital representations;
- determining the DC offset present in each digital representation;
- removing said determined DC offset;
- and
- transmitting said digital representations with said DC bias and said DC offset removed.
Dependencies are inferred from the claim text.