Method for suppressing noise in a digital speech signal
CA 2304571 A1 · Owner: Lockwood, Philip · Inventors: Lubiarz, Stephane; Lockwood, Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method which consists in carrying out a spectral subtraction comprising: a first subtraction step taking into account the maximised estimations (B'¿n,i?) of the noise spectral components so as to obtain spectral components (S?2¿¿n,f?) of a first enhanced signal; computing a masking curve (M¿n,q?) by applying an auditory perception model based on the first enhanced signal spectral components; and a second subtraction step which consists in subtracting respectively from each spectral component of the speech signal on the frame a quantity depending on the parameters including a variation between the maximised estimation of the corresponding spectral component of the …
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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 September 16, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 2020.
- 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.