Tone detection using neural network
CA 2315323 A1 · Owner: Nortel Networks Corporation · Inventors: Ahmadi, Masoud
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tone detector for detecting a tone such a DTMF tone by converting the signal to, the frequency domain, then extracting signal features to input to an artificial neural, network. The neural network is trained to detect the tone or detect which of , many, predetermined tones is present. It can be arranged to operate more quickly than, conventional tone detection methods. This is particularly significant for coding or, compressing signals which contain tones and other information. Since it is often, more efficient to code or compress such tones separately from the other information, it can be essential to detect and separate such tones very quickly to, avoid the risk of a single tone …
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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 July 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2022.
- 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.