H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/34
H04N 7/08 (2006.01) H04N 7/06 (2006.01) H04N 11/24 (2006.01)
Patent
CA 2008600
ABSTRACT OF THE DISCLOSURE High definition television (HDTV) signals are transmitted in a manner to be compatible with television receivers that operate to reproduce standard definition images, and the broadcast HDTV signals can be contained within an existing frequency band allocated for transmission of the standard definition images. A high definition image source generates an image with a resolution of N horizontal lines, wherein N is a positive number equal to about twice the line resolution of a standard definition television image frame. Odd line image signals corresponding to each odd numbered line of the image frame, and even line image signals corresponding to each even numbered line of the image frame, are separately derived. The odd line image signals are modulated on a radio frequency (RF) carrier wave signal to produce HDTV odd line image signals occupying at most the same frequency band or channel as occupied by standard definition images, and the even line image signals are modulated on a RF carrier wave signal to produce HDTV even line image signals that occupy at most the same frequency band or channel as occupied by standard definition images. The odd and the even line image signals are simultaneously radiated from respective antennas having mutually orthogonal polarizations.
Riches Mckenzie & Herbert Llp
Zucker Leo
LandOfFree
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