Television – Format – Including additional information
Patent
1992-08-21
1995-01-31
Groody, James J.
Television
Format
Including additional information
348 1, 348907, 380 5, 380 17, H04N 708, H04N 716
Patent
active
053862406
ABSTRACT:
An encoder/decoder can insert and demodulate an information signal without affecting a video signal, the information signal being not analyzed, modified and deleted easily. The non-inverted and inverted information signals are inserted into two horizontal lines having a strong correlation in the same field or different fields separated by at least one field of the video signal. A difference of the inserted information signals is obtained by a combination of a delay circuit and a subtracter. Field difference signals Sx and Sy are applied to a band pass filter and are generated by a PSK generation circuit. Generated output signals Qx and Qy are converted into unit information by a majority decision logic circuit and are stored in a memory. A unit information group consisting of a predetermined number of stored bits is used to generate the meaningful information. The inserted information signal has a low level and is inserted in the video period and the unit information is generated by the field difference. Thus, the information signal cannot be analyzed, modified and deleted easily.
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Groody James J.
Metjahic Safet
Nippon Television Network Corporation
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