Digital video recording apparatus and method

Details Digital video recording apparatus and method Digital video recording apparatus and method

1997-03-20

2000-02-15

Chevalier, Robert

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 88, 386 46, H04N 5911, H04N 595, H04N 591

Patent

active

060262141

ABSTRACT:
A system for recording AVS data (Audio Video and Subcode data) onto a magnetic tape that contains previously recorded data. When performing an AVS insertion according to the invention, the ITI (Insert and Track Information) portion of the previously recorded data is preserved while the AVS portion of the previously recorded data is overwritten. In order to match the frame phase of the old ITI data with the frame phase of the new AVS data the leading edge of a head switching signal is monitored. By counting the number of occurrences of the leading edge of the head switching signal, cuing the insertion of the new AVS data to the count, and resetting the count upon the occurrence of a frame change in the previously recorded data, the new AVS data and the previously recorded ITI data are frame synchronized.

REFERENCES:
patent: 5724475 (1998-03-01), Kirsten
patent: 5892982 (1999-04-01), Mitsuda et al.

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