Automatic d-c offset cancellation in pcm encoders
CA 1109155 A · Owner: Northern Telecom Limited · Inventors: Meyer, Fred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
During encoding of voice frequency (YF) signal in a PCM channel bank the encoder encounters direct current (d-c) offset component resulting from the particular VF signal. Such d-c offsets cause errors above and beyond the normal encoders inherent in the normal encoding process. The present invention alleviates this problem by providing an automatic d-c offset cancellation circuit which closely follows the d-c offset component and provides a d-c component of opposite sign to cancel it.
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 September 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 1998.
- 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.