CSP- DIGITAL COMPUTERS AND CSSHARDWARE SYSTEMS OF A BASICALLY DIGITAL NATURE, COMPUTER-INHERENT OR COMPUTERORIENTED, WHICH WHOLLY OR IN CONCERT PROVIDE SUCH DIGITAL SIGNAL PROCESSING FUNCTIONS AS AUTO-CORRELATION, CROSSCORRELATION, CONVOLUTION, CEPSTRA, OTHER FOURIER TRANSFORM TECHNIQUES, RECURSIVE DIGITAL FILTERING, ENSEMBLE AVERAGING, AMPLITUDE HISTOGRAMS, AND DIRECT COMPUTATION OF SUCH FUNCTIONS AS AUTO-CORRELATION, CROSS-CORRELATION, AND CONVOLUTION