Method and apparatus for synchronizing recreated DAT frames and

Details Method and apparatus for synchronizing recreated DAT frames and Method and apparatus for synchronizing recreated DAT frames and

1993-03-08

1995-03-28

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 13, G11B 509, G11B 2702

Patent

active

054022754

ABSTRACT:
A system employing a shift register for serially delivering the bits of recreated IEC time code from a DAT recorder to a video recorder for synchronous playback of audio and video information. In order to accomplish exact synchronization despite possible variations in the frame lengths of the IEC time code recorded, the shift register is driven by a variable frequency clock. During playback the actual phase differences between the DAT frames and the IEC frames being output are detected, and deviations of these actual phase differences from desired phase differences between the DAT frames and IEC frames supplied are constantly monitored. The repetition frequency of the clock pulses applied to the shift register is increased or decreased whenever the deviation of each actual phase difference from one associated desired phase difference exceeds a predetermined limit.

REFERENCES:
patent: 4896337 (1990-01-01), Bushy, Jr.
patent: 5172677 (1993-01-01), Kizu et al.

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