Wideband speech coder
CA 2208384 C · Owner: Serizawa, Masahiro · Inventors: Serizawa, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An LPC analyzer 12 calculates an LPC, coefficients from a speech signal input from an input terminal 10 through LPC analysis. An LPC coder 14 codes the LPC coefficients. An impulse response circuit 16 calculates an impulse response from the LPC coefficients obtained by the decoding. A band divider 18 divides the band of the impulse response. LPC analyzers 22 and 24 calculate each subband LPC coefficients. A band divider 20 divides the band of the input speech signal input from the input terminal 10 and produces each subband speech signal. Coders 26 and 28 code excitation signal by using the LPC coefficients and speech signal of each subband. A multiplexer 30 outputs each code as a …
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 June 20, 1997 and granted January 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2019.
- 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.