Digital signal huffman coding with division of frequency sub-bands
US6215422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1998 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Aug 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention proposes a digital signal coding method including a step of analysing (E1) the digital signal (IM) into a plurality of frequency sub-band signals distributed according to at least two different frequency bands, at least one first sub-band signal having a lower frequency and at least one second sub-band signal having a higher frequency, PA1 characterised in that it includes, for each second sub-band signal, the steps of: PA2 dividing (E4) the second sub-band signals into blocks (B.sub.i,n), PA2 selecting (E9) blocks to be coded by setting to a predetermined value, according to a selection criterion, PA2 coding the blocks selected by setting to the predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.