Hearing aid with adaptive matching of microphones
CA 2380396 C · Owner: Widex A/S · Inventors: Jensen, Lars Baekgaard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hearing aid with a controllable directional characteristic having at least two spaced apart microphones (Mic 1, Mic 2) in at least two microphone channels at least one signal processing unit, at least one output transducer and a directional controlling system, with means for adaptively matching the characteristics of at least two microphones. This novel hearing aid comprises an adaptive phase matching circuit (1) inserted into said at least two , microphone channels the adaptive phase matching circuit (1) having its outputs connected to an acoustical delay compensation means (2) followed by a , parameter control circuit (3) the output of which is applied to a , controllable filter …
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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 August 3, 1999 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2021.
- 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.