Trick play schemes for advanced television recording on digital VCR

Three technical elements that together implement trick-play modes of digital VCR for ATV recording are proposed: a data arrangement format, a trickplay tracking algorithm, and a coefficient extraction algorithm. First, an efficient tape format is carefully designed for fast forward and reverse playbacks at various speeds. It can accommodate two pickup head configurations. The success of this formal relies on a reliable trick-play tracking scheme. This tracking scheme is capable of automatically driving the pickup heads to trace the correct trajectory in typically less than 350 ms. Lastly, an adaptive coefficient extraction algorithm is presented, which produces fairly good quality trick-play images under severe bit limitation. A related issue is to choose a balanced bit budget that provides a good compromise between 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