发明名称 |
IMPROVED DEVICE FOR DCT ENCODING OF DIGITAL VIDEO SIGNALS |
摘要 |
<p>The digital video signal is decomposed in intrafield blocks each comprising a set number of adjacent image elements, and each intrafield block, or an interfield block or an interframe block derived therein, is subjected to a Discrete Cosine Transform and the transformed signal is applied to quantizer to generate a quantized signal which is encoded at variable length and loaded to a transmission buffer, the quantization resolution being inversely proportional to the buffer fill rate. According to the invention, a digital low-pass filter is connected to filter the block to be subjected to Discrete Cosine Transform, and is subjected to the buffer so that its upper-frequency cutoff lowers as the buffer fill rate increases.</p> |
申请公布号 |
EP0396846(B1) |
申请公布日期 |
1993.04.28 |
申请号 |
EP19890830208 |
申请日期 |
1989.05.12 |
申请人 |
RAI RADIOTELEVISIONE ITALIANA |
发明人 |
STROPPIANA, MARIO;RONCHETTI, LUIGI |
分类号 |
H04N7/30;G06T9/00;H03M7/30;H04N1/41;H04N7/26;H04N7/32;H04N7/36;H04N7/50 |
主分类号 |
H04N7/30 |
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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