Digital discriminator for pulse shaped pi/4 shifted differentially encoded quadrature phase shift keying
CA 2065648 A1 · Owner: Chennakeshu, Sandeep · Inventors: Chennakeshu, Sandeep; Saulnier, Gary Jude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
RD-20,183, DIGITAL DISCRIMINATOR FOR PULSE SHAPED .pi./4 SHIFTED- DIFFERENTIALLY ENCODED QUADRATURE PHASE SHIFT KEYING ABSTRACT, A digital radio receiver for synchronization of radiowave transmissions for digital and analog FM signals in TDMA systems such as cellular telephones uses a tangent type discriminator that minimizes the bit error rate. The digital discriminator employs A/D converter circuit that samples a received intermediate frequency (IF) signal a sorter circuit, that produces a predetermined number of samples to be used in the decoding, a sample and phase adjustment circuit that allows for a carrier phase adjustment and sample timing adjustment a, divider circuit that …
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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 April 9, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2014.
- 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
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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.