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US 6,275,967 B1Granted
Optical disk drive using y0+y1 signal detection
AssigneeTexas Instruments Incorporated
InventorRyohei Kuki
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Abstract
The present invention implements a maximum likelihood detector for optical disk drive without using a Viterbi detector. The detection algorithm that includes y0+y1 detection is very simple by requiring only one adder and one comparator, and not survival path memories.
Claims1
A y(0)+y(1) detection method for an optical disk wave form, comprising:
- performing demodulation method for decoding a d>=1 modulation code;
- performing 3-level sampling;
- performing y(0)+y(1) addition;
- and
- performing 2 level detection,
- correcting a d*T pattern;
- detecting a d*T pattern;
- and
- comparing y(0)+y(1) and y−(d+1)+y−d.
6 more elements
Dependencies are inferred from the claim text.