Device for the dct encoding of digital video signals

Details Device for the dct encoding of digital video signals Device for the dct encoding of digital video signals

H - Electricity

04

N

350/33

H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/32 (2006.01) H04N 7/36 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2012641

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 quantized 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-pas 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.

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