Partial response maximum likelihood (PRML) signal processing app

Details Partial response maximum likelihood (PRML) signal processing app Partial response maximum likelihood (PRML) signal processing app

1997-04-21

1998-07-14

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

360 39, H04L 2706

Patent

active

057815909

ABSTRACT:
A PRML (Partial Response Maximum Likelihood) signal processing apparatus for both MP (Mark Position) recorded medium and ME (Mark Edge) recorded medium. The apparatus has a PR (Partial Response) equalizer to which the reproduction signal from the medium is inputted, a folded back value calculation circuit for folding back an input signal thereto with a predetermined level, and a Viterbi detector having a path memory and performing a Viterbi detection. The path memory is constructed based on a structure of a trellis for a signal recorded by the MP recording. In case of the MP recorded medium, the equalizer transfer characteristics and the reference amplitude both for the MP recording are set to the PR equalizer and the Viterbi detector, respectively, and the output of the PR equalizer is directly supplied to the Viterbi detector. On the other hand, in case of the MP recorded medium, the equalizer transfer characteristics and the reference amplitude both for the ME recording are set, and the output of the PR equalizer is supplied to the Viterbi detector via the folded back value calculation circuit.

REFERENCES:
patent: 5680380 (1997-10-01), Taguchi et al.
Onoe, "Hikari Disuku Gijutsu (Optical Disck Technology)", Radio Gijutsu (Radio Technoloy), pp. 184-185, 1989.
Proceeding of Institute of Television Engineering (ITE), pp. 287-288, 1994.

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