Prejudging current state in a decoder for coded signal processing channels
US5430745A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1994 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Feb 17, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M5/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Decoder for processing digital sample values corresponding to an incoming read signal representative of coded binary data. Functional expressions of digital sample values are precomputed for a preselected number of sample values ahead of a current sample value. To provide binary decision outputs, preselected functional expressions are compared against binary representations of corresponding thresholds that are conditioned by the sign of a selected functional expression comprising at least one preselected digital sample value. These outputs, the sign of the selected functional expression, the current value and previous value of decoded data, and the current value of detected phase, are all used to determine the next value of decoded data and next value of detected phase. These next values become the current values of decoded data and detected phase for the next clock cycle. The binary representations input to the comparators and the binary decision outputs of the comparators are inverted only if the selected functional expression has a preselected sign.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.