Microphone array apparatus and method for extracting desired signal
CA 1208758 A · Owner: Nippon Telegraph And Telephone Corporation · Inventors: Ohga, Juro; Kaneda, Yutaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An acoustic signal is received by a plurality of microphone elements and their outputs are delayed by delay means and weighted and summed up by weighted summation means, obtaining a noise-reduced output. A fictitious desired signal is electrically generated and the weighting values of the weighted summation means is determined based on the fictitious desired signal and the outputs of the microphone elements when receiving substantially only noises.
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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
- Granted July 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2003.
- 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.