Frequency detector based on a digital phase lock loop
CA 2031145 C · Owner: Kivari, Raimo Kalervo · Inventors: Strommer, Esko Kaarlo Juhani; Tenhunen, Juha Heikki; Kivari, Raimo Kalervo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a frequency detector based on a digital phase lock, the detector being especially suitable for use in an SAT frequency detector of mobile telephones in the TACS and AMPS systems. The detector part of the detector according to the invention comprises a detection timer (6) which forms a detection sequence of the desired length at the end of which, the output signal (SATVAL) of the detector part (5) is updated; a first phase detector VI1 (7) having a detection window in which it counts those rising or falling edges of the synchronized input signal (SSAT) which coincide with the windows a second phase detector VI2 (8) also having a detection window of its own in which …
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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 29, 1990 and granted October 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.