When recording a PCM signal, particularly an audio signal, on the oblique tracks of a magnetic tape, e.g. for example of a videorecorder, errors occur in the digital signal during the change of heads. These errors are removed in that, in the region where the scanning of the heads overlaps, phase matching...http://www.google.de/patents/US4636875?utm_source=gb-gplus-sharePatent US4636875 - Playback device for a digital signal recorded by a plurality of heads
