Optical disk apparatus permitting high-precision Viterbi...

Details Optical disk apparatus permitting high-precision Viterbi... Optical disk apparatus permitting high-precision Viterbi...

2005-07-19

2005-07-19

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

Binary pulse train information signal

Including sampling or a/d converting

C369S059190, C369S124050

Reexamination Certificate

active

06920100

ABSTRACT:
The optical disk apparatus is provided with a Viterbi decoder and an expected value correction circuit. The branch metric operation unit calculates first, second and third errors between sampling data and expected values, and outputs them to the expected value correction circuit. The expected value correction circuit extracts the sampling data in a region where its variation is small based on the first, second and third errors, calculates the average values of the extracted sampling data to correct the first, second and third expected values, and outputs the corrected expected values to the branch metric operation unit. The Viterbi decoder performs Viterbi decoding of the sampling data based on the first, second and third corrected expected values. Thus, high-precision Viterbi decoding is permitted even if the amplitude value of the reproduction signal varies.

REFERENCES:
patent: 5719843 (1998-02-01), Nakajima et al.
patent: 5796693 (1998-08-01), Taguchi et al.
patent: 6603722 (2003-08-01), Taguchi et al.
patent: 6618338 (2003-09-01), Fujiwara et al.
patent: 6781938 (2004-08-01), Nanba et al.
patent: 9-320206 (1997-12-01), None

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