Noise reduction for automatic speech recognition
CA 2566751 C · Owner: Gemello, Roberto · Inventors: Mana, Franco; Gemello, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a noise reduction method for automatic speech recognitionl. A noise reduction method for automatic speech recognition including: computing a magnitude spectrum (Yk(m) of a noisy speech containing a clean speech to be recognized and noise affecting the clean speech; computing a power spectrum ( Yk(m 2) of the noisy speech; computing an estimate ( Xk (m) 2 of a power spectrum of the clean speech; computing an estimate ( Dk (m 2) of a power spectrum of the noise; computing an estimate (.xi.k(m)2) of an a priori signal-to-noise ratio as a function of the estimate ( Xk,(m)?2) of the power spectrum of the clean speech and the estimate ( Dk(m)?2of the power spectrum of …
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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 May 14, 2004 and granted July 16, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2026.
- 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.