Patents by Inventor William J. St. Arnaud

William J. St. Arnaud has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for secure audio channel transmission in a CATV system
    Patent number: 4586081
    Abstract: A secure audio channel transmission system method and apparatus in which an FM signal is generated on an FM broadcast frequency, such as 107.5 megahertz, divided in frequency by 2 and distributed via a cable television system to subscribers equipped with frequency doubler circuits that reconstitute the FM signal for reception on a standard FM broadcast receiver. Unauthorized reception is prevented by the use of the non-standard, frequency-divided signal which is not receivable by standard broadcast channel television or FM receivers.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: April 29, 1986
    Assignee: Lincoln Center for the Performing Arts, Inc.
    Inventors: William J. St. Arnaud, Israel Switzer