Television – Format – Including additional information
Patent
1994-05-03
1997-04-15
Kostak, Victor R.
Television
Format
Including additional information
348486, H04N 7081
Patent
active
056214715
ABSTRACT:
A system and method for modulating a data signal uses a phase shifting transformer function to phase shift the lower and upper sidebands of the data signal so that the sidebands of the data signal have a 180.degree. phase shift with respect to each other (i.e., are complementary). The phase shifted sidebands are added to a standard video signal and then transmitted. A television or other video receiver demodulates the video signal with a simple demodulator circuit, which causes the upper and lower sidebands to be summed together. The data signal, with complementary sidebands, cancels out so that the data signal does not interfere with normal video operation. The upper and lower sidebands of the data signal are processed separately from the video processing circuitry of the television receiver. An inverse phase shifting circuit performs a second phase shift operation on the upper and lower sidebands of the data signal so that the data signal can be demodulated and the data signal recovered.
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Kim William E.
Myhrvold Nathan P.
Yuval Gideon A.
Kostak Victor R.
Microsoft Corporation
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