Serial bitstream code for timing-based servo

Details Serial bitstream code for timing-based servo Serial bitstream code for timing-based servo

1997-07-08

1999-07-13

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

Substituting specified bit combinations for other prescribed...

360 7712, H03M 700

Patent

active

059232722

ABSTRACT:
Disclosed is a coding technique which takes advantage of the use of an internal synchronization technique for a timing-based servo which employs alternating 4 and 5 transition bursts of servo to provide a simplified synchronization of the data, and comprises a coding technique which employs a periodic pattern of bursts each period comprising two bursts of 5 transitions followed by two bursts of 4 transitions. The code provides, in each burst of 5 transitions, two defined positions for the 2nd and 4th transitions, spaced from equally spaced positions in the burst, to represent each of two bit values. The code provides, in each burst of 4 transitions, two defined positions for the 2nd and 3rd transitions, spaced from equally spaced positions in the burst, to represent each of two bit values. The bitstream is encoded in words comprised of one or more 4 bit symbols, the words separated by a 6 bit word separator symbol, 2 of the symbols of the possible 16 employed for the word separator symbol, leaving 14 symbols available for data.

REFERENCES:
patent: 4549232 (1985-10-01), Axmear et al.
patent: 5003412 (1991-03-01), Bizjak et al.
patent: 5070421 (1991-12-01), Sumiya et al.
patent: 5321570 (1994-06-01), Behr et al.
patent: 5689384 (1997-11-01), Albrecht et al.

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