Sound acquisition method and system, and sound acquisition and reproduction apparatus
CA 2120019 C · Owner: Prescom · Inventors: Zurcher, Frederic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Several microphones (M1, M3) are arranged substantially in the same plane (P) and they are distributed symmetrically with respect to a direction of symmetry (D) perpendicular to this plane (P). A phase shift is applied between the signals output respectively by different microphones (M1, M3) and the signals thus phase shifted are added, in such a way as substantially to cancel the signals relating to any sound wave arriving in phase and with the same intensity on each of the microphones (M1 M3). The apparatus may. moreover, be equipped with a loudspeaker (4) arranged on the direction of symmetry (D) and oriented alone this direction, opposite the microphones (M1, M3). Use especially with …
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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 October 2, 1992 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2014.
- 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.