Am stereophonic transmitter
CA 1189573 A · Owner: Sony Corporation · Inventors: Yokoya, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An AM stereophonic signal transmitter includes a matrix circuit which generates a sum signal corresponding to the sum of left and right channel stereophonic signals and a difference signal corresponding to the difference between the left and right channel stereophonic signals; a first phase shifting circuit which phase shifts the sum signal by -45°; a second phase shifting circuit which phase shifts the difference signal by +45°; a sub-modulator which modulates the phase-shifted difference signal by the phase-shifted sum signal to produce a first modulated output signal having the form Y+(1 + mtX_), where X_ represents the phase-shifted sum signal, mt represents the modulation factor of the …
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 June 25, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 25, 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
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.