发明名称 |
Fernsehübertragungssystem mit differentieller Kodierung von Transformationskoeffizienten. |
摘要 |
In a television transmission system for digital picture signals each picture is divided into sub-pictures of N x N picture elements for the purpose of limiting the bit rate. Each sub-picture is subjected to a two-dimensional forward transform to determine coefficients. These coefficients are converted into a series of serially occurring coefficients in which the AC coefficients in this series are arranged in such a way that the magnitude variation of these AC coefficients in the series is monotonous. The magnitudes of the AC coefficients thus arranged are subjected to a differential encoding so that the difference between the magnitudes of two successive AC coefficients is transmitted instead of the magnitude of the AC coefficients themselves. |
申请公布号 |
DE68908254(T2) |
申请公布日期 |
1994.02.17 |
申请号 |
DE1989608254T |
申请日期 |
1989.05.03 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN, EINDHOVEN, NL |
发明人 |
DE WITH, PETER HENDRIK NELIS, NL-5656 AA EINDHOVEN, NL |
分类号 |
H04N7/26;H03M7/30;H04N7/30;H04N7/32;H04N7/50;(IPC1-7):H04N7/133 |
主分类号 |
H04N7/26 |
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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