In an apparatus for time-compression video recording and time-expansion reproduction, first and second memory address counters are initialized in response to there being a simultaneous presence of vertical and horizontal sync pulses. Until the next vertical blanking period the counters are continuously...http://www.google.co.uk/patents/US4692814?utm_source=gb-gplus-sharePatent US4692814 - Jitter-immune time expansion for time-compressed line-sequential video signals
