Musical entertainment system
CA 2090948 C · Owner: Ivl Technologies Ltd. · Inventors: Bertsch, John P.; Gibson, Brian C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a karaoke-type entertainment system that allows a participant to sing along with a prerecorded song. The system includes a microphone for producing an input vocal signal that corresponds to the singer's voice and a , pitch, corrector samples the input vocal signal and determines its pitch. The pitch corrector shifts the pitch of the input signal to correspond to the pitch of a reference note which in turn corresponds to the correct pitch at which the melody, is to be sung. The pitch corrector thereby alters the pitch of the input vocal signal, to correspond to the pitch of the reference note so that the participant is singing, "on pitch" with the melody.
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 March 3, 1993 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 2015.
- 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.