Digital data demodulating apparatus
CA 2112151 C · Owner: Nec Corporation · Inventors: Ushirokawa, Akihisa; Okanoue, Kazuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a digital data demodulating apparatus a, sampling circuit samples a received signal at a speed N x K(N > 1, K > l; integers) times a symbol rate to output received signal sequences. N received signal sequence selection circuits estimate channel impulse responses from the respective received signal sequences to obtain channel state data, and output a control pulse and the estimated channel impulse response values. A received signal sequence selection controller outputs a switch control signal on the basis of the channel state data. N selectors select demodulation received signal sequence candidates from the received signal sequences on the basis of the control pulse. A first switch …
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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 December 22, 1993 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 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.