Processing speech signals
CA 2445378 A1 · Owner: Ealey, Douglas Ralph · Inventors: Kelleher, Holly Louise; Ealey, Douglas Ralph; Pearce, David John Benjamin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of processing a speech signal in noise comprising: determining a , frequency spectrum of a frame of the speech signal; determining a value of the pitch of the frame of the speech signal; identifying peakes (12 14, 16, 22, 28, 32) in the spectrum; and evaluating the peaks individually to determine respective scores for the peaks, the score for a peak being a measure of the likelihood that the peak is a harmonic band of teh speech signal. As a consequence there is: (a) no need for high f0 accuracy as there is no need to predict long sequences of harmonic positions; and (b) no need for an assumption of harmonic integrity at all points.
Read the whole patent
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 April 22, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2024.
- 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.