PASM and TASM forward error correction and detection code method and apparatus
US4849976A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1987 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Aug 3, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/29
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A PASM and TASM encoding method with the steps of storing a block of a data-bit sequence in a memory, calculating parity-check symbols, and outputting an encoded data bit sequence. The PASM encoding method includes calculating a first set of parity-check symbols from the data-bit sequence along a first set of parity lines, and calculating at least a second set of parity-check symbols from the data symbols and parity-check symbols along a second set of parity lines, wherein each parity line of the second set of parity lines has a path traversing through the parity-check symbols. The TASM encoding method includes calculating a first parity-check symbol from data symbols and parity-check symbols along a first parity line having a first slope and calculating at least a second parity-check symbol from data symbols and parity-check symbols along a second parity line having a second slope, wherein the second parity line traverses through the first parity-check symbol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.