Seismic data acquisition system

摘要

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.