Methods for non-linearly quantizing and non-linearly dequantizing an information signal using off-center decision levels
US5946652A · kind A · utility
Inventor
Key dates
| Filing date | Jun 24, 1996 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Jun 24, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B14/048
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Data representing an information signal are non-linearly quantized to generate respective quantized data that represent the information signal using fewer bits. Each of the data, when non-linearly quantized, is represented by a quantizing level selected from a number of quantizing levels. The data are non-linearly quantized according to a non-linear function, the decision levels being off-center between adjacent quantizing levels obtained thereby from the quantizing values. The data and word-length information indicating the number of quantizing levels are received. A quantizing value for each quantizing level in the number of quantizing levels is determined from the word-length information and the non-linear function. The quantizing values determined for all the quantizing levels in the number of quantizing levels are non-uniformly spaced. Finally, the quantizing level having the quantizing value closest in value to the data value of each of the data is selected as a respective one of the quantized data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.