An integrator integrates the central portion of each signaling interval of a PCM input signal for a time less than the reciprocal of the PCM baud rate. Means responsive to the integrated signal or a manifestation thereof performs a comparison operation at the end of the integration period and stores...http://www.google.de/patents/US4278992?utm_source=gb-gplus-sharePatent US4278992 - PCM Detector for video reproducer apparatus
