H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/088 (2006.01) H04N 5/44 (2006.01) H04N 7/52 (2006.01) H04N 7/60 (2006.01)
Patent
CA 2226588
A digital waveform generator complies with different vertical blanking interval (VBI) standards, and is inserted into VBI portions of a digital component video signal. A buffer receives symbols carrying VBI data for a particular VBI service according to a user data syntax, which identifies a television line into which the VBI data is to be inserted. A symbol processor is responsive to information provided by the syntax. This information indicates the number of pixels represented per symbol, a symbol transition time, and the number of symbols carrying data to be inserted into the VBI portion. The symbol processor provides the VBI data in a format according to the particular VBI service. A timing circuit is responsive to a start time provided by the syntax for inserting the VBI data. A level control circuit adjusts the level of the VBI data prior to insertion into the VBI portion in response amplitude values provided by the syntax.
Nuber Ray
Walker G. Kent
General Instrument Corporation
Nextlevel Systems Inc.
Ridout & Maybee Llp
LandOfFree
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