Improving error rate on radio teletype circuits
CA 1065409 A · Owner: Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence Of Her Majesty'S Canadian Government · Inventors: Baker, Charles L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Existing single channel radio teletype circuits employing single frequency shift, i.e. mark/space, are prone to interference from static impulse, type noise, and selective fading. The present invention provides time diversity which improves the error rates of such circuits. A stream of binary coded data is divided into first and second identical data streams. The data in the second stream is delayed by a predetermined number of frames. Subsequently, a comparison of the data in the two streams is made and one-offour digital signals are produced dependent on the results of the comparison. The one-of-four signals are used to produce corresponding audio tones which are transmitted. At the …
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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 October 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 30, 1996.
- 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
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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.