发明名称 |
An adaptive leak HDTV encoder |
摘要 |
<p>In a differential PCM encoder, the problem of error perpetuation is solved by leaking a changing, rather than a fixed, fraction of the input signal to the differential PCM. The fraction leaked is sensitive to the characteristics of the signal. In one embodiment the fraction leaked is fixed for a frame in accordance with a chosen characteristic of the frame signal. In another embodiment, the fraction leaked is set in accordance with one function when a chosen characteristic of the frame signal exceeds a given level, and follows another function when the chosen characteristic does not exceed the chosen level. In a still another embodiment, the fraction leaked is set to one of two levels, based on a chosen characteristic of the frame signal.</p> |
申请公布号 |
EP0490538(B1) |
申请公布日期 |
1997.04.09 |
申请号 |
EP19910311062 |
申请日期 |
1991.11.29 |
申请人 |
AT&T CORP. |
发明人 |
JOHNSTON, JAMES DAVID;KNAUER, SCOTT C.;MATTHEWS, KIM N.;NETRAVALI, ARUN NARAYAN;PETAJAN, ERIC D.;SAFRANEK, ROBERT J.;WESTERINK, PETER H. |
分类号 |
H03M7/30;H04N7/015;H04N7/26;H04N7/28;H04N7/32;H04N7/50;H04N11/04;(IPC1-7):H04N7/48 |
主分类号 |
H03M7/30 |
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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