Television – Format conversion
Patent
1997-12-19
2000-02-22
Lee, Michael H.
Television
Format conversion
348845, 348416, 348459, H04N 701
Patent
active
060286393
ABSTRACT:
A process and apparatus for converting an MPEG-2 bitstream into an SMPTE-259 compatible bitstream is characterized by a frame rate converter which is selectively enabled to drop every 1001st frame of the incoming MPEG-2 bitstream depending on the input bitstream frame rate. If the input bitstream frame rate is other than 29.97 or 59.94 Hz, a frame dropper is enabled to discard every 1001st frame. The present converter can convert many different types of input bitstreams, such as all I types, IPIP types, or complex GOP types containing I, P, and B frames. The enabled frame dropper will drop either the I or P frame if it occurs as the 1001st frame, but if the 1001st frame is of the B frame type, the pixel information of the B frame is dropped. This produces a minimum in loss of information during the conversion. The format converter allows existing SMPTE-259 routing equipment to route and utilize MPEG-2 bitstreams, such as HDTV applications.
REFERENCES:
patent: 5715009 (1998-02-01), Tahara et al.
patent: 5835151 (1998-11-01), Sun et al.
patent: 5852565 (1998-12-01), Demos
Bhatt Bhavesh Bhalchandra
Jonsson Ragnar Hlynur
Herrmann Eric P.
Kurdyla Ronald H.
Lee Michael H.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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