Method of coding a digital signal, method of generating a coding table, coding apparatus and coding method
US5510785A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1994 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Mar 17, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Generating a plurality of tables based on a condition series, such as non-zero coefficient size groupings, by repeatedly executing an operation in which the quantization step of a quantizer is controlled by supplying the total code word length generated by a variable length coder to the quantizer. Coefficient data is coded by selecting a table based on a preceding condition series and the current condition series is coded based on the selected table. Thus, the total code word length is decreased. The coding apparatus includes a Huffman table generating apparatus, a transform circuit, a quantizer, and a variable length coder having a memory for storing the Huffman tables for every condition series.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.