Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1995-02-28
1997-02-04
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341 61, 364734, H04B 1404, G06F 1500
Patent
active
056003188
ABSTRACT:
The present invention is a method of processing digitized signal samples generated by a free running analog-to-digital converter and sampled at a first sample rate. The method includes the steps of convolving the digitized signal samples with a single-stage digital filter and generating a series of resampled signal samples having a second sample rate no greater than the first sample rate. The resampled signal samples are synchronized with a predetermined time reference during the step of generating the series of resampled signal samples.
The present invention is also an apparatus for recording seismic surveys. The apparatus comprises: a delta-sigma analog-to-digital converter; a means for calculating an average of a plurality of outputs of the delta-sigma converter; a means for subtracting the average from a single output of the converter; and a single-stage digital filter which has the capability of synchronizing digital signal samples from the delta-sigma converter to a predetermined time reference and can resample the digital signal samples to a lower sampling rate than that rate provided by the delta-sigma converter.
REFERENCES:
patent: 4193118 (1980-03-01), Nash et al.
patent: 5235534 (1993-08-01), Potter
patent: 5465270 (1995-11-01), Beauducel et al.
patent: 5512894 (1996-04-01), Ikeyama et al.
Fagin Richard A.
Gaffin Jeffrey A.
Jean-Pierre Peguy
Western Atlas International Inc.
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