Coding system and method for partial response channels
US6385255B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1999 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Aug 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/497
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for reading data to and writing data from multi-level (M-ary) partial response channels uses a trellis coder to encode an input bit stream sequence into a stream of multi-level data symbols. The data symbols are written to the partial response channel using any of a number of techniques. Preferably, the trellis coder anticipates the modulation transfer function of the partial response channel in encoding the data. Because the partial response channel has its own transfer function, the relationship between the data read from the channel and the actual input data bits is a function not only of the data encoder but also of the partial response channel. Therefore, a decoder specification used to implement the decoder takes into account the effect of the trellis encoder as well as the effect of the partial response channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.