A relatively low power phase-shift-keyed (PSK) subcarrier encoding digital information is admixed with composite video signal. The PSK subcarrier is at an odd multiple of half the scan line frequency of the composite video signal, and the symbol rate is at a multiple of the scan line frequency. The PSK...http://www.google.fr/patents/US5461426?utm_source=gb-gplus-shareBrevet US5461426 - Apparatus for processing modified NTSC television signals, with digital signals buried therewithin
Apparatus for processing modified NTSC television signals, with digital ...
