HDTV Sub-band coding using IIR filter bank
US4918524A · kind A · utility
87Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1989 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Mar 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique for the sub-band decomposition and reconstruction of video signals is disclosed. In an illustrative embodiment of the present invention, each field of a video signal is decomposed into sub-bands utilizing a polyphase filter bank unit including an infinite impulse response allpass filter with coefficients that are powers of two. To reconstruct the original image, an FIR is utilized which approximates an IIR allpass filter This eliminates the need for a full field memory in the reconstruction process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.