Convergence improvement for oversampled subband adaptive filters
CA 2399159 A1 · Owner: Dspfactory Ltd. · Inventors: Abutalebi, Hamid Reza; Nadjar, Hamid Sheikhzadeh; Brennan, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of improving the convergence properties of the oversampled subband adaptive filters is disclosed. The method comprises steps of: (a) whitening by spectral emphasis, where, after WOLA analysis subband signals, are decimated by a factor of M/OS where M is the number of filters and OS is the, oversampling factor, or (b) whitening by additive noise where high-pass noise , is, added to bandpass signals to make them whiter in spectrum; or (c) whitening by decimation, where the subband signals are further decimated by a factor of DEC<OS; or (d) a combination of the above steps (a),(b) and (c).
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 August 16, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 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.