Apparatus and method for synchronizig audio and video tape playe

Details Apparatus and method for synchronizig audio and video tape playe Apparatus and method for synchronizig audio and video tape playe

1990-01-24

1992-06-02

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record editing

360 7302, G11B 2702, G11B 1546

Patent

active

051192420

ABSTRACT:
In synchronizing audio and video tape players each reproducing a tape having recorded thereon a time code signal comprising digital words each containing data identifying a video frame, the time code signals are detected and frame pulse signals recovered from them are applied to a PLL (phase locked loop) controlling the speed of one of the players whereby the two players are synchronized by phase locking between the frame pulse signals such that the time code signals have a desired mutual temporal relationship. In the event of failure to detect at least one of the time code signals, the one player is driven at a fixed speed. On resumption of detection of both time code signals after such a failure, synchronization of the players is reestablished as follows. The drive of the one player at the fixed speed is stopped. Further pulse signals derived from the time code signals are applied to the PLL (pulse locked loop) which establishes phase locking between them. One or the other of the further pulse signals is then repeatedly inverted whereby the PLL (phase locked loop) repeatedly establishes phase locking between them, each time with a 180.degree. step in their phase relationship. When the repeated inversion has stepped the phase relationship of the further pulse signals such that the frame pulse signals are in synchronization and the time code signals have the desired temporal relationship, the frame pulse signals are again used for synchronization.

REFERENCES:
patent: 4554602 (1985-11-01), Tobe
patent: 4862411 (1989-08-01), Dishon et al.

Affiliated with

Also associated with

Rating

Apparatus and method for synchronizig audio and video tape playe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for synchronizig audio and video tape playe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for synchronizig audio and video tape playe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2233910