Television – Format – Including additional information
Patent
1995-06-07
1996-09-10
Kostak, Victor R.
Television
Format
Including additional information
348468, H04N 7087
Patent
active
055550258
ABSTRACT:
An asynchronous circuit for decoding Vertical Blanking Interval (VBI) television data having any one of a plurality of VBI formats comprises an input circuit, a register, a programmable clock generator, and a controller. The input circuit receives an analog television signal including VBI data and converts the television signal into standard digital form. The register receives and stores the VBI data in the digitized signal. The programmable clock generator receives a program signal from the controller and generates a clock which has a frequency that is an integer multiple of the data frequency, as determined by the program signal. The clock is asynchronous with the VBI data. The controller receives the digitized television signal, the clock, and a format signal from a host computer system indicating which VBI format is to be decoded. The controller provides the program signal based on the format signal and provides a sample signal at the data frequency in response to the clock signal and the VBI data, causing the register to load VBI data at approximately the midpoint in time of each bit of VBI data.
REFERENCES:
patent: 5463423 (1945-10-01), Tults
Intel Corporation
Kostak Victor R.
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