Fdm-tdm transmultiplexing system
CA 1252923 A · Owner: Nec Corporation · Inventors: Ichiyoshi, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An FDM-TDM transmultiplexing system for a modulation/demodulation device which is applicable to a regenerative repeating system of a satellite or a ground radio communication system is disclosed which uses chirp-ztransform. A chirp filter is implemented with a digital circuit. The circuit scale of the digital chirp filter increases in proportion to a square root of the total number of channels N enhancing, miniaturization of an FDM-TDM transmultiplexer.
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
- Granted April 18, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 18, 2006.
- 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.