Modem including an equalizer for amplitude jitter
CA 2128609 C · Owner: Universal Data Systems, Inc. · Inventors: Rushing, Mickey Cleveland; Blackwell, Steven Ray
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A modem (100) includes an equalizer for equalizing a received signal (10) for amplitude jitter distortion. The received signal includes modulated symbols based on a predetermined constellation of points each point representing a symbol. The modem first extracts a modulated symbol to provide an extracted symbol R(k), which includes amplitude jitter distortion. The modem then identifies a signal point Pn(k) of the predetermined constellation corresponding to the extracted symbol. Further the, modem determines an error signal (76) based on the amplitude jitter distortion and then uses the error signal to compensate subsequent extracted symbols for the amplitude jitter distortion.
Read the whole patent
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 January 4, 1993 and granted November 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2015.
- 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.