Multiplexed coded modulation with unequal error protection
US5214656A · kind A · utility
124Cited by
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32Claims
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Assignee
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Key dates
| Filing date | Dec 13, 1990 |
| Grant date | May 25, 1993 |
| Priority date | — |
| Expiry date | Dec 13, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Unequal error protection is provided for an HDTV signal by separately coding each one of the classes of information in the HDTV signal by using a conventional coded modulation scheme and then time-division-multiplexing the various coded outputs for transmission. In particular, each class of information is separately coded by a 4-dimensional 8-state trellis code and a uniformly-spaced (QAM) signal constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.