Wide biphase digital servo information detection, and estimation

Details Wide biphase digital servo information detection, and estimation Wide biphase digital servo information detection, and estimation

1996-07-24

1997-08-26

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 46, 360 48, 360 7708, H04D 2706, H03D 100

Patent

active

056617607

ABSTRACT:
A synchronous sampling data detection channel includes a data transducer head positioned by a servo-controlled actuator over a recording track of a rotating data storage disk, a preamplifier for receiving electrical analog signals magnetically induced by the data transducer head from flux transitions present in at least the servo information field, a digital sampler for synchronously sampling the electrical analog signals to produce digital samples, and a Viterbi detector coupled to receive digital samples from the synchronous sampling data detection channel for decoding 1/4 T coded wide biphase servo information patterns patterns as maximum likelihood servo data sequences, wherein the wide biphase magnet patterns are arranged e.g. as ++-- magnet patterns for a binary zero information value and --++ magnet patterns for a binary one information value.

REFERENCES:
patent: 5036408 (1991-07-01), Leis et al.
patent: 5341387 (1994-08-01), Nguyen
patent: 5345342 (1994-09-01), Abbott et al.
patent: 5384671 (1995-01-01), Fisher
patent: 5420730 (1995-05-01), Moon et al.
patent: 5521945 (1996-05-01), Knudson
patent: 5576906 (1996-11-01), Fisher et al.

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