TRICK PLAY SCHEMES FOR ADVANCED TELEVISION RECORDING ON DIGITAL VCR

In this paper, three technical elements that together implement trick- play modes of digital VCR for ATV recording are proposed: a data arran gement format, a trick-play tracking algorithm, and a coefficient extr action algorithm. First, an efficient tape format is carefully designe d for fast forward and reverse playbacks at various speeds. It can acc ommodate two pickup head configurations. The success of this format re lies on a reliable trick-play tracking scheme. This tracking scheme is capable of automatically driving the pickup heads to trace the correc t trajectory in typically less than 350 ms. Lastly, an adaptive coeffi cient extraction algorithm is presented, which produces fairly good qu ality trick-play images under severe bit limitation. A related issue i s to choose a balanced bit budget that provides a good comprise betwee n picture spatial quality and temporal quality. Simulations at a video recording bit rate of 25 Mb/s have been conducted to demonstrate the effectiveness of our proposed system.