Method and apparatus for digitally processing a high definition television augmentation signal
US5128758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1989 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jun 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for digital encoding are described for compressing the augmentation channel signals (chrominance and luminance signals for panel information and high frequency luminance and line difference signal) so that this information can be transmitted in a 3 MHz wide RF channel using a digital transmission scheme such as QPSK. Analog signal components are sampled and converted to digital signals. Each of the signals is fed into a separate coder which reduces the number of bits/pixel required to reconstruct the original signal. Compression is achieved by quantization and removal of redundancy. The compression scheme is based on the use of DCT together with VLC. Each augmentation signal has its own coder, which is adapted to the unique statistics of this signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.