Television – Format – Including additional information
Patent
1992-09-25
1994-05-03
Groody, James J.
Television
Format
Including additional information
348469, H04N 987, H04N 708
Patent
active
053092350
ABSTRACT:
A system and method for transmitting digital data in the horizontal overscan portion of a composite video signal is presented. A source supplies digital data which is encoded by a 32-state QAM encoder using a symbol clock having a frequency 4f.sub.sc, 4 times the color subcarrier frequency (f.sub.sc), then the encoded data is quadrature amplitude modulated using a carrier signal with a frequency of f.sub.sc /2. The modulated digital data replaces the video signal in the horizontal and vertical overscan portions of the baseband video signal. The video signal is received, the modulated digital data is extracted from the video signal, demodulated using QAM techniques, and decoded with a reconstructed version of the symbol clock.
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Grant Chris
Groody James J.
Matsushita Electric Corporation of America
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