Video optimized modulator-demodulator

Details Video optimized modulator-demodulator Video optimized modulator-demodulator

H - Electricity

04

N

350/40, 350/56

H04N 5/40 (2006.01) H03C 5/00 (2006.01) H03D 1/00 (2006.01) H04N 7/14 (2006.01)

Patent

CA 1295413

VIDEO OPTIMIZED MODULATOR-DEMODULATOR ABSTRACT OF THE DISCLOSURE A video optimized, low-cost modulator-demodu- lator is provided. Each modulated state or symbol (am- plitude, phase, frequency or a combination thereof) has a one-to-one correspondence with a particular pixel value of brightness. For a black and white picture, adjacent shades of gray for the pixels are assigned to adjacent amplitude, phase or frequency values so that any error in transmission results in a pixel having its shade changed only slightly. A multiple amplitude, two-phase modulation method is preferably used. The black and white values are assigned to the highest am- plitude level at opposite phases. As the pixel value becomes less black or white and more gray, it is assigned lower and lower amplitude levels with its phase being determined by whether it is closer to black or to white. Other features are also disclosed.

511519

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