Television – Bandwidth reduction system – Data rate reduction
Patent
1996-08-08
1998-10-06
Britton, Howard
Television
Bandwidth reduction system
Data rate reduction
348415, 348715, H04N 736
Patent
active
058185330
ABSTRACT:
An MPEG decoder system and method for decoding frames of a video sequence. The MPEG decoder includes frame reconstruction or decoder logic which operates to reconstruct a bi-directionally encoded (B) frame with minimal memory requirements. The MPEG decoder operates to decode or reconstruct the frame twice, once during each field display period. The picture reconstruction unit operates to decode or reconstruct the B frame twice, once each during a first field time and a second field time. The first field time substantially corresponds to the time when the first or top field of the picture is displayed, and the second field time substantially corresponds to the time when the second or bottom field of the picture is displayed. This obviates the necessity of storing the reconstructed B frame data, thus reducing memory requirements. The present invention also eliminates the storage requirement of the B-frame without substantially increasing the bandwidth required from external semiconductor memory when compared to prior art methods.
REFERENCES:
patent: 5198901 (1993-03-01), Lynch
patent: 5329365 (1994-07-01), Uz
patent: 5646693 (1997-07-01), Cismas
patent: 5717461 (1998-02-01), Hoogenboom
Auld David R.
Chau Kwok
Britton Howard
Hood Jeffrey C.
LSI Logic Corporation
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