Television – Bandwidth reduction system – Data rate reduction
Patent
1998-01-29
1999-10-26
Britton, Howard
Television
Bandwidth reduction system
Data rate reduction
348416, H04N 750
Patent
active
059737409
ABSTRACT:
A digital signal decoder system is provided for receiving digital video signals and processing them while reducing the external memory requirements for frame buffer storage for an MPEG-2 decoder through decimation. The system includes an expansion filter, such as a polyphase finite impulse response (FIR) horizontal filter for re-expanding decimated macroblock data to original form. This expansion filter is a variable filter which automatically adjusts expansion of the decimated macroblock data using the decimation factor employed by the decimation unit of the digital video decoding system. The automatically adjusting of expansion includes dividing the upsample ratio of the filter by the decimation factor received from the decimation unit. The expansion filter also includes a predefined phase correction associated with the decimation factor and style employed by the decimation unit. The predefined phase correction ensures spatial accuracy of macroblock data output from the expansion filter. The filter may alternatively comprise a high frequency filter for filtering high frequency affects from decimated macroblock data, e.g., when the digital video decoder system is sending decimated macroblock data to an associated display unit for display in decimated form.
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Britton Howard
International Business Machines - Corporation
LandOfFree
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