Tracking control circuit and method in digital image recording a

Details Tracking control circuit and method in digital image recording a Tracking control circuit and method in digital image recording a

1997-04-30

1999-07-27

Faile, Andrew I.

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 79, 386 90, 360 71, H04N 591

Patent

active

059304480

ABSTRACT:
A tracking control circuit is disclosed for use in a digital image recording and reproducing device which has a mechanism (22) for controlling the movement of a magnetic medium according to a servo control signal, which has an error correction code decoder (12), and which reproduces data recorded on the recording medium in sync blocks. The tracking control circuit includes a bit error rate detector (14), a control unit (16, 18) and a servo circuit (20). The bit error rate detector (14) calculates the frequency of bit errors in the reproduced data by counting the number of error flags from the error correction code decoder in each sync block to thereby producing bit error rate data. The control unit (16, 18) generates tracking control data corresponding to bit error rate data generated by the bit error rate detector (14) when the bit error rate data from the bit error rate detector exceeds a predetermined limit. The servo circuit (20) provides a servo control signal corresponding to the tracking control data which is supplied from the control unit (16, 18).

REFERENCES:
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patent: 5038229 (1991-08-01), Mester
patent: 5193010 (1993-03-01), Juri et al.
patent: 5381292 (1995-01-01), Richmond
patent: 5490017 (1996-02-01), Nakamura et al.
patent: 5684916 (1997-11-01), Hong
patent: 5760988 (1998-06-01), Abe et al.

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