Television – Bandwidth reduction system – Data rate reduction
Patent
1992-09-17
1994-04-05
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
H04N 7133
Patent
active
053010191
ABSTRACT:
A data compression system responsive to a preprocessed digitally encoded high definition video signal includes a discrete cosine transform, a frequency weighting filter, and an inverse discrete cosine transform circuit to provide a digitally encoded video signal within which the high frequency terms of the discrete cosine transform have been reduced. A motion compensated predictive coding data compression system organizes the current frame and a previous frame into a plurality of pixel blocks. The pixel blocks are compared by an error calculating and matching circuit under the influence of a timing control to provide an error value output. A spatial weighting factor is applied to each error value output to provide spatially weighted error values which are used to produce a corresponding plurality of motion vectors. The motion vector corresponding to the lowest weighted error value is selected by a motion vector selector for application to a channel buffer/encoder and eventual transmission.
REFERENCES:
patent: 5134477 (1992-07-01), Knauer
patent: 5142360 (1992-08-01), Niihara
patent: 5173773 (1992-12-01), Ueda
Britton Howard W.
Zenith Electronics Corp.
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