The method and apparatus of the present invention is directed to architectures for signal processing, such as for performing analog-to-digital and digital-to-analog conversions, in which the source signal is decomposed into subband signals by an analysis filter, processed, and the processed subband signals...http://www.google.de/patents/US6252535?utm_source=gb-gplus-sharePatent US6252535 - Method and apparatus for acquiring wide-band pseudorandom noise encoded waveforms
