Method and device for encoding-decoding a narrow band high definition digital television signal
US5311308A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Mar 19, 1991 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Mar 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/048
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and device are provided for encoding-decoding an HD digital television signal into a narrow band encoded signal. The HD digital television signal is representative of high definition images sampled at a frequency f1, and the narrow band encoded signal corresponds to a narrow band signal sampled at f2, wherein f2<f1. Narrow band encoding is achieved by horizontal compression by decimation of the image lines of the HD digital television signal so as to bring the number N1 of useful pixels per image line to a value N2=.alpha. of the sampling frequencies, so as to thus form an encoded signal representative of an image line and obtain reduced format high definition images. A narrow band encoded signal representative of digital television signals can thus be broadcast over an HD-MAC NB type channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.