Method and apparatus for the transmission of speech signals
CA 2081441 C · Owner: Ntt Mobile Communications Network Inc. · Inventors: Miki, Toshio; Ohya, Tomoyuki; Uebayashi, Shinji
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 method of communicating a speech signal over a communication medium which utilizes what is called VOX (Voice Operated Transmitter) control and a speech signal transmitting unit and a speech signal receiving unit used in the method are disclosed. The speech signal includes at least one speech-active duration in which an actual speech of the speech signal exists and one silent duration in which no actual speech of said speech signal exists. At a transmitting side, the speech signal is analyzed for each of successive frames thereof to determine whether each frame is in the speech-active duration, and is coded for each of successive frames thereof to produce a …
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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 October 26, 1992 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 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.