Digital gmsk modulator with non-integer bit interval handling
CA 2000475 C · Owner: Motorola, Inc. · Inventors: Wang, Chih-Fei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, A modulation circuit is used in a GMSK modulation system. The system includes I-channel (210) and Q-channel (212) ROM look-up tables, each proprogrammed for generating a representative digital waveform based on an input data stream (250) and a clock signal (252). Each digital waveform is converted to an analog signal for subsequent radio frequency (RF) modulation. Each ROM is addressed by an interpolation counter (224) controlled by a clock signal (252) by a data shift register (226), receiving input data (250) at a rate corresponding to the clock signal, and by a quadrant register (230) also receiving the input, data, for specifying the phase of the data signal with …
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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 October 11, 1989 and granted May 3, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2011.
- 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.