Method and apparatus of recording or reproducing stereophonic information in a magnetic record carrier, magnetic record carrier and amplifier circuit to be used in conjunction with an apparatus for carrying out the method
CA 1194222 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Rijckaert, Albert M.A.; Walraven, Anthonie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
19, ABSTRACT:, In accordance with a method of recording and/or reproducing stereophonic information in two adjacent tracks of a magnetic record carrier an auxiliary signal whose frequency content is situated beyond the frequency spectrum of the stereophonic information is recorded in the tracks and in the magnetic record-carrier area between the tracks during recording. During reproduction use can be made of the auxiliary signals read from the record carrier by the two transducers in order to obtain a control system which ensures that the amplitude of the stereophonic information thus reproduced becomes independent of tracking errors.
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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, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2002.
- 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.