Decoding the output signal of a partial-response class-IV communication or recording device channel
US4644564A · kind A · utility
69Cited by
8References
3Claims
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Key dates
| Filing date | Oct 15, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Oct 15, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03369
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A maximum-likelihood sequence decoder is used with a partial-response signaling system for processing sequences of sampled values from a communication channel or recording device. The partial-response signals can be duobinary, dicode, or partial-response class-IV. The maximum-likelihood decoding for each sequence can be based upon a two-state trellis. Instead of two survivor metrics for two states, only a difference metric is necessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.