Information reproducing apparatus and its automatic equalization

Details Information reproducing apparatus and its automatic equalization Information reproducing apparatus and its automatic equalization

1995-10-10

1999-06-29

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375230, H03D 100

Patent

active

059178620

ABSTRACT:
A maximum likelihood detection of a convolution code Yn obtained by coupling a transversal equalizer to a code Zn of a recording and reproducing channel. A branch metric is arithmetically operated by changing a weight of a data train of a convolution code corresponding to multiplication coefficients of a filter by a distributor with respect to a reproduction signal Rn. On the basis of the branch metric, an ACS circuit judges a maximum likelihood path at every path node and the results are stored into a path memory 56. Simultaneously with the maximum likelihood detection, metrics of the maximum likelihood paths judged with respect to the path nodes are compared by a maximum likelihood path comparing circuit, thereby deciding the maximum likelihood path node. A maximum inclination arithmetic operating circuit calculates a maximum inclination of the multiplication coefficients of the filter. The next multiplication coefficients are updated by an updating circuit.

REFERENCES:
patent: 3792356 (1974-02-01), Kobayashi et al.
patent: 5138314 (1992-08-01), Shimpuku et al.
patent: 5381359 (1995-01-01), Abbott et al.
patent: 5579340 (1996-11-01), Tokuriki et al.
patent: 5619167 (1997-04-01), Adachi
patent: 5621769 (1997-04-01), Wan et al.

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