Quantizing signals using sparse generator factor graph codes
US6771197B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2003 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Sep 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/6577
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method quantizes an input signal of N samples into a string of k symbols drawn from a q-ary alphabet. A complementary method reproduces a minimally distorted version of the input signal from the quantized string, given some distortion measure. First, an [N,k]q linear error-correcting code that has a sparse generator factor graph representation is selected. A fixed mapping from q-ary symbols to samples is selected. A soft-input decoder and an encoder for the SGFG codes is selected. A cost function is determined from the input signal and a distortion measure, using the fixed mapping. The decoder determines an information block corresponding to a code word of the SGFG code with a low cost for the input signal. The input signal can be reproduced using the encoder for the SGFG code, in combination with the fixed mapping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.