Duplex speech transmission method and a system therefor
CA 1231788 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: White, Philip D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a duplex speech transmission method and a system therefor and has particular but not exclusive, application to cordless telephone systems. In known time division duplex transmission systems speech by one party is digitalised at a certain mean bit rate and then time-compressed and applied in alternate slots in a speech transmission channel the remaining slots, being used by the other party on the link. The disadvantage of this known system is that when one person is not speaking then his slots on the transmission channel are left vacant. In the method described when it is determined that one party has no valid speech to send in his time slot then the other party is …
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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
- Granted January 19, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 19, 2005.
- 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.