Television – Format conversion
Reexamination Certificate
2007-04-23
2009-06-09
Natnael, Paulos M (Department: 2622)
Television
Format conversion
Reexamination Certificate
active
07545438
ABSTRACT:
A graphics integrated circuit chip is used in a set-top box for controlling a television display. The graphics chip processes analog video input, digital video input, graphics input and audio input simultaneously. The system includes a video decoder having a chroma-locked sample rate converter. The chroma-locked sample rate converter converts the samples to those taken at a sample rate that is a multiple of the chroma subcarrier frequency and that is locked to chroma bursts of the analog video signal in a control loop. The video decoder also includes a line-locked sample rate converter that receives samples at a multiple of the chroma subcarrier frequency and converts the samples to samples with a sample frequency that is a multiple of the horizontal line rate of the video input. The line-locked sample rate converter measures the horizontal line rate to an accuracy of a fraction of a pixel and adjusts the sample rate and phase of the line-locked sample rate converter to produce accurate line-locked samples. The time base corrector receives samples at the output of the line-locked sample rate converter and provides samples synchronized to the display clock for reducing undesirable artifacts such as jitter.
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Kranawetter Greg A.
MacInnis Alexander G.
Patterson James T.
Tang Chengfuh Jeffrey
Xie Xiaodong
Broadcom Corporation
McAndrews Held & Malloy Ltd.
Natnael Paulos M
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