Coding to improve timing recovery in a sampled amplitude read ch

Details Coding to improve timing recovery in a sampled amplitude read ch Coding to improve timing recovery in a sampled amplitude read ch

1996-07-29

1998-11-17

Tse, Young T.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375290, 360 51, 341 59, H03M 746

Patent

active

058387382

ABSTRACT:
A partial response class-IV (PR4) read channel is disclosed for magnetic recording including a coding scheme which improves timing recovery by providing a more accurate phase error estimate. The conventional 1/(1+D.sup.2) precoder is not used in the present invention (to avoid the ambiguous initial state), so that the read channel can directly control the flux transitions written onto the magnetic disc. This enables the read channel to encode user data according to a criteria that creates well defined slopes in the analog read signal at the sample instances, thereby improving the accuracy of the timing recovery phase error estimate.

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R. Cideciyan, F. Dolivo, R. Hermann, W. Hirt, and W. Schott, "A PRML System For Digital Magnetic Recording", IEEE Journal On Selected Areas Of Communications, vol. 10, No. 1, Jan. 1992.

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