Auxiliary television signal system
CA 1162294 A · Owner: Matsushita Electric Corporation Of America · Inventors: Rzeszewski, Theodore S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case No. 4300.232, ABSTRACT, Auxiliary signals suitable for conveying additional audio signals for stereophonic television broadcasts bilingual sound, and the like, are transmitted in the form of modulated bursts of such auxiliary signal placed on the front porch of the composite video signal and continued through the vertical synchronization pulse intervals. At the receiver, a transmission gate is connected to receive the composite video signal and has an output coupled to an auxiliary signal demodulation circuit. The transmission gate is operated to pass only the auxiliary signal bursts in response to control signals obtained from the sweep circuit of the television receiver. By utilizing …
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 February 14, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2001.
- 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.