Method and apparatus for objective speech quality measurements of telecommunication equipment
CA 2277975 C · Owner: Psytechnics Limited · Inventors: Hollier, Michael Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A telecommunications testing apparatus comprises a signal generator (7) which generates a speech-like synthetic signal which is supplied to the input , of a, telecommunication apparatus (1) to be tested. The distorted output of the telecommunications apparatus (1) is supplied to an analysis used (8) which, derives, for both the undistorted test signal and the distorted signal from the, telecommunications apparatus (1), a measure of the excitation of the human auditory system generated by both signals taking into account both spectral, masking and temporal masking phenomena. The difference between the two excitations is then calculated, and a measure of the loudness of the difference, and …
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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 June 24, 1993 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 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
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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.