Variable bit rate MPEG2 video decoder having variable speed fast

Details Variable bit rate MPEG2 video decoder having variable speed fast Variable bit rate MPEG2 video decoder having variable speed fast

1997-01-08

1999-11-09

Tung, Bryan

Television

Bandwidth reduction system

Data rate reduction

348845, 386 68, H04N 724

Patent

active

059824310

ABSTRACT:
A variable bit rate MPEG2 video decoder having a variable rate fast playback function includes a variable rate fast playback processor with a portion determining the fullness of a video buffer according to the amount of data input to and output from the video buffer; a fast playback rate controller for calculating a variable rate control parameter S representing the number of bi-directional predicted (B) pictures to be restored within one group of pictures (GOP) for the fast playback mode and a parameter D representing the sequence of B pictures to be restored during the fast playback mode according to the total number (T) of pictures and the number (N) of B pictures within one GOP and the buffer's fullness output from the portion for determining the fullness of the video buffer; and an effective data detector and transmitter for detecting a picture start code to detect data of a picture layer, classifying data of pictures and counting the number of B pictures to transmit effective data for the fast playback mode according to the variable rate control parameter S and the parameter D representing the sequence of B pictures. Accordingly, B pictures to be restored during the fast playback are arranged in sequence based on the buffer's fullness.

REFERENCES:
patent: 5432769 (1995-07-01), Honjo
patent: 5664044 (1997-09-01), Ware
patent: 5754241 (1998-05-01), Okada
patent: 5809454 (1998-09-01), Okada

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