Loudspeaker with large displacement motional feedback
CA 2408045 A1 · Owner: Audio Products International Corp. · Inventors: Hlibowicki, Stefan R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a distortion reduction system and method for reducing an acoustic distortion in an loudspeaker. The invention involves: a) generating a first sensor signal based on longitudinal displacement of the voice coil from the initial rest position; b) generating a second sensor signal based on longitudinal acceleration of the voice coil; c) processing and combining the first sensor signal and the second sensor signal to generate a feedback control signal; and d) adjusting an audio drive signal supplied to the voice coil to generate the acoustic waveform wherein the audio drive signal is adjusted based on the first feedback control signal.
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 October 11, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 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.