Intermodulation correction for combined analog- and digital-format rf transmitters
CA 2254375 A1 · Owner: Acrodyne Industries, Inc. · Inventors: Hulick, Timothy P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Out-of-channel intermodulation distortion in a combined analog and digital television, (DTV) signal is corrected using a circuit preferably operating at intermediate frequency (IF). The circuit provides out-of DTV-channel suppression of DTV intermodulation components, in a way that better protects an analog (for example NTSC) signal in an , immediately-adjacent channel at radio frequency (RF). When adjacent-channel DTV and analog, television signals are amplified by a single high-power amplifier, the , intermodulation corrector circuit suppresses the out-of-DTV-channel DTV intermodulation products to below, the threshold of visibility (TOV) of the analog channel viewer. In particular …
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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
- Filed November 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2020.
- 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.