The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 1990
Filed:
Dec. 20, 1988
Vincent Caprarese, Bois Colombes, FR;
Didier Goguillon, Fourqueux, FR;
U.S. Philips Corporation, , NY (US);
Abstract
A method of and system for scrambling/descrambling audio transmission in which periods of silence in the sound to be transmitted are detected and utilized to trigger immediately changing the scrambling mode and for also transmitting a control signal to alert the receivers to the mode change. The scrambled sound signal is transmitted with a small decay with respect to the control signal which, in practice, may be provided by an intrinsic delay in the transmission circuits. In a TV transmission system, the control signal is advantageously transmitted in the video channel.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile