Flexible vocabulary recognition
CA 2069675 C · Owner: Kenny, Patrick Joseph · Inventors: Gupta, Vishwa Nath; Toulson, Christopher Kenneth; Lennig, Matthew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flexible vocabulary speech recognition system is provided for recognizing speech transmitted via the public switched telephone network. The flexible vocabulary recognition (FVR) system is a phoneme based system. The phonemes are modelled as hidden Markov models. The vocabulary is represented as, concatenated phoneme models. The phoneme models are trained using Viterbi training, enhanced by: substituting the covariance matrix of given phonemes by others applying energy level thresholds and voiced unvoiced, silence labelling , constraints during Viterbi training. Specific vocabulary members such as digits, are, represented by allophone model. A* searching of the lexical network is …
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 May 27, 1992 and granted June 27, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 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.