Playback method and apparatus for reproducing encoded data...

Details Playback method and apparatus for reproducing encoded data... Playback method and apparatus for reproducing encoded data...

H - Electricity

04

N

H04N 7/50 (2006.01) H04N 5/783 (2006.01) H04N 5/85 (2006.01) H04N 9/804 (2006.01) H04N 9/877 (2006.01)

Patent

CA 2168419

Encoded data is reversely reproduced by decoding each picture only once and using only as many frame memory sections as are needed in a normal playback operation. A picture header detector detects a picture header from data read out from a video code buffer to identify the type of picture. The picture type information controls a picture data selecting circuit for selecting frames of I and P pictures equal in number to the number of frame memory sections in a frame memory bank. The selected frames are supplied to an inverse VLC circuit to be decoded, starting at the head of a GOP with an I picture. The decoded I and P pictures are stored in the frame memory bank and transmitted to a display unit, starting with the temporally most recent picture and reading backward.

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