Video signal recording and playback, rearranging dct...

H - Electricity – 04 – N

Patent

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Details

H04N 7/50 (2006.01) G11B 20/10 (2006.01) G11B 27/30 (2006.01) H04N 5/76 (2006.01) H04N 5/783 (2006.01) H04N 7/30 (2006.01) G11B 20/12 (2006.01) H04N 9/79 (2006.01) H04N 9/804 (2006.01) H04N 9/806 (2006.01)

Patent

CA 2286251

In order to obtain a high-quality image when an encoded stream which is encoded using MPEG is played back at variable speed, a stream conversion apparatus is provided which converts an arrangement of DCT coefficients of a source encoded stream into an arrangement suitable for variable-speed playback. Specifically, a header part is separated from an elementary stream of MPEG, and DCT coefficients arranged from a low order of a spatial frequency to a high order are extracted by zigzag scan at intervals of a plurality of DCT blocks which form a macro block. These DCT coefficients are rearranged from a low order to a high order across a plurality of DCT blocks. The DCT coefficients rearranged in this manner are packed into a stream, and the separated header part is added, forming a converted elementary stream. This converted elementary stream is recorded. During high-speed playback, even if there is an error in the middle of the macro block, since decoding is possible using a low-order DCT coefficient, high-quality image video data can be obtained.

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