Video optimized modulator-demodulator
CA 1295413 C · Owner: Luma Telecom, Inc. · Inventors: Meyer, Charles S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A video optimized, low-cost modulator-demodulator is provided. Each modulated state or symbol (amplitude, 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 amplitude level at opposite phases. As the pixel value becomes less black or white and more gray it is assigned, lower and …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 4, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.