发明名称 |
Coded modulation with unequal levels of error protection. |
摘要 |
<p>Digital signals, such as digitized television signals, are subjected to a source coding step in which a class of "most important" data elements represents a proportionately greater amount of the information to be communicated than the rest of the data elements. This is followed by a constellation mapping step which is carried out in such a way that those data elements have a lower probability of being erroneously detected at the receiver than the others. The constellation mapping step uses coded modulation in order to provide enhanced noise immunity for the "most important" data element class. <IMAGE></p> |
申请公布号 |
EP0485108(A2) |
申请公布日期 |
1992.05.13 |
申请号 |
EP19910310012 |
申请日期 |
1991.10.30 |
申请人 |
AMERICAN TELEPHONE AND TELEGRAPH COMPANY |
发明人 |
WEI, LEE-FANG |
分类号 |
H04B14/04;H03M13/23;H03M13/35;H04L1/00;H04L27/34;H04N5/44;H04N7/08;H04N7/30 |
主分类号 |
H04B14/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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