Adaptive seismic signal processor

Claim 2

An adaptive seismic signal processor with a portable seismic data acquisition unit for providing a plurality of sampling rates for recording digitized seismic signals in the portable seismic data acquisition unit, comprising: processor means with the seismic data acquisition unit for sampling digitized seismic signals at a plurality of sampling rates and for passing cooperatively coupled frequency domains of the sampled digitized seismic signal so as to preclude the generation of alias frequencies, wherein pass band frequency domains are determined from a set of digital filter coefficients; programmable memory means with the seismic data acquisition unit for storing a plurality of sets of filter coefficients for determining pass band frequency domains; and selector means with the seismic data acquisition unit responsive to command signals from a remote location for selecting one of the plurality of sampling rates and for addressing one of the sets of filter coefficients in the programmable memory means to the processor means whereby the processor means samples and passes a cooperatively coupled pass band frequency domain of the digitized seismic signal.

Claim 3

The apparatus of claim 1 wherein said processor means includes: at least two digital filters connected in cascade.

Claim 4

The apparatus of claim 2 wherein each successive digital filter has a predetermined frequency domain an octave step lower than the preceding digital filter.

Claim 5

The apparatus of claim 2 wherein said digital filters are finite impulse response filters.

Claim 8

The method of claim 5 wherein frequency domain is cooperatively coupled to one of the plurality of resampling rates according to: SR=1/F.sub.c 2 where SR is the resampling rate in samples/second and F c is the highest frequency content in each predetermined frequency domain in Hz.

Claim 9

An adaptive seismic signal processor with portable seismic data acquisition units including: at least two digital filters connected in cascade, each digital filter being adapted to bandpass a predetermined frequency domain of an input digital seismic signal; timing means for resampling the filtered digital seismic signal of each digital filter so as to provide a plurality of resampling rates; programmable memory means for storing a plurality of sets of filter coefficients for use with the digital filters, whereby each set of filter coefficients provides a predetermined pass band frequency domain cooperatively with the resample rates so as to preclude the generation of alias frequencies; and selector means responsive to a command signal from a remote location for selecting one of the resampling rates of the timing means during the course of acquiring the input digital seismic signal and for addressing sets of the filter coefficients to the digital filters whereby the pass band frequency domain of each digital filter is cooperatively coupled with the resampling rates of the timing means so as to preclude the generation of alias frequencies.

Claim 10

An adaptive seismic signal processor with portable seismic data acquisition units including: at least two digital filters connected in cascade, each digital filter being adapted to bandpass a predetermined frequency domain of an input digital seismic signal; timing means for resampling the filtered digital seismic signal of each digital filter so as to provide a plurality of resampling rates; programmable memory means for storing a plurality of sets of filter coefficients for use with the digital filters, whereby each set of filter coefficients provides a predetermined pass band frequency domain cooperatively with the resample rates so as to preclude the generation of alias frequencies; and selector means responsive to a command signal from a remote location for selecting one of the resampling rates of the timing means during the course of acquiring the input digital seismic signal and for addressing sets of the filter coefficients to the digital filters whereby the pass band frequency domain of each digital filter is cooperatively coupled with the resampling rates of the timing means so as to preclude the generation of alias frequencies.

Claim 11

An adaptive seismic signal processor with a portable seismic data acquisition unit for providing a plurality of sampling rates for recording digitized seismic signals in the portable seismic data acquisition unit, comprising: digitizing means with the portable seismic data acquisition unit for digitizing input seismic signals; decimation means with the portable seismic data acquisition unit for sampling the digitized seismic signals at a plurality of sampling rates; filtration means with the portable seismic data acquisition unit for passing a plurality of frequency pass bands cooperatively coupled to the sampling rates of said decimation means so as to preclude generation of alias frequencies in the sampled digitized seismic signals, wherein each frequency pass band is determined by a set of filter coefficients; programmable memory means with the portable seismic data acquisition unit for storing sets of filter coefficients for use with said filtration means in generating frequency pass bands cooperatively coupled to the sampling rates; and selector means with the portable seismic data acquisition unit responsive to transmitted coded signals for selecting sampling rates for said decimation means and for selecting sets of filter coefficients for said filtration means, wherein the selected set of filter coefficients have frequency pass bands cooperatively coupled to the selected sampling rates so as to preclude generation of alias frequencies.

Claim 12

An adaptive seismic signal processor with a portable seismic data acquisition unit for providing a plurality of sampling rates for recording digitized seismic signals in the portable seismic data acquisition unit, comprising: digitizing means with the portable seismic data acquisition unit for digitizing input seismic signals; decimation means with the portable seismic data acquisition unit for sampling the digitized seismic signals at a plurality of sampling rates; filtration means with the portable seismic data acquisition unit for passing a plurality of frequency pass bands cooperatively coupled to the sampling rates of said decimation means so as to preclude generation of alias frequencies in the sampled digitized seismic signals, wherein each frequency pass band is determined by a set of filter coefficients; programmable memory means with the portable seismic data acquisition unit for storing sets of filter coefficients for use with said filtration means in generating frequency pass bands cooperatively coupled to the sampling rates; and selector means with the portable seismic data acquisition unit responsive to transmitted coded signals for selecting sampling rates for said decimation means and for selecting sets of filter coefficients for said filtration means, wherein the selected set of filter coefficients have frequency pass bands cooperatively coupled to the selected sampling rates so as to preclude generation of alias frequencies.