Digital modulator
CA 1289634 C · Owner: Harris, Robert Michael · Inventors: Harris, Robert Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Signal modulation apparatus for the transmission of binary data signals embodying a process which results in superior side-lobe suppression compared with other forms of modulation such as frequency shift keying. The apparatus generates two carrier waves the, difference between whose frequencies Is an integral multiple of the data signal bit-rate, amplitude modulates the two waves by a low-pass filtered data signal and an inverted version thereof respectively and then sums the resulting modulated waveforms to produce a frequency keyed waveform having continuous phase and almost negligible envelope ripple. The apparatus can be used with most forms of digital communication systems and may be …
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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 September 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2008.
- 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.