Data frequency modulator with deviation control
CA 1237477 A · Owner: Motorola, Inc. · Inventors: Carney, Scott N.; Linder, Donald L.; Goode, Steven H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, An automatic deviation control circuit for an angle modulated data transmitter is disclosed wherein the deviation level of modulated data output from VCO (300) is controlled by a modulation cancelling deviation error detection feedback loop comprising mixer (600). phase detector (408A), low pass filter (410) and VCO (406). After the modulation is cancelled by said feedback loop from a sample of modulated carrier by a predetermined value of deviation developed by divider (302) residual, modulation is detected by phase detector (408A) sampled, by S/H (808 and 810) following a predetermined number of like-level data bits, and applied to the modulation path gain of amplifier (802) to …
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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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 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.