Apparatus and method for automatic tracking during abnormal play

Details Apparatus and method for automatic tracking during abnormal play Apparatus and method for automatic tracking during abnormal play

1996-01-16

1997-11-04

Tran, Thai

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 78, 360 64, 360 7713, H04N 5783, H04N 593

Patent

active

056849168

ABSTRACT:
A video tape playback device in which heads are tracking-controlled according to a predetermined tracking control value, in order to accomplish automatic tracking so that noise is not regenerated on the screen during an abnormal speed playback. The device has a direct-current (DC) envelope detector for detecting a direct-current (DC) envelop signal of a video signal read out a video tape via video heads; a comparator for comparing the detected DC envelop signal with a predetermined threshold value, and outputting a pulse signal representing the comparison result; a servo portion for performing a tracking operation according to a tracking control value, and generating a pulse of a head switching signal; and a controller for detecting a difference of time between a falling edge in the pulse signal output from the comparison means and a point of level alteration time of the head switching pulse, and controlling the predetermined tracking control value so that the detected time difference is within a range where noise is not regenerated on a screen to be displayed.

REFERENCES:
patent: 4451860 (1984-05-01), Honjo et al.
patent: 4720753 (1988-01-01), Iwasaki et al.
patent: 5214546 (1993-05-01), Yamada
patent: 5218489 (1993-06-01), Jeong et al.
patent: 5546247 (1996-08-01), Fujioka et al.

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