1
David S McVoy: Secured communications system. Broadband Technologies, Wender Murase & White, July 16, 1985: US04530008 (114 worldwide citation)

Apparatus and method for reducing the cost and complexity of equipment placed on subscribers' premises in a subscription communications system, such as a cable television system, while at the same time providing security against unauthorized system access includes a microprocessor controlled frequen ...


2
David S McVoy: Apparatus and method for monitoring a communications system. Broadband Technologies, Wender Murase & White, June 10, 1980: US04207431 (46 worldwide citation)

Apparatus and method for monitoring the quality and integrity of a communications system, such as a cable television system, which includes several monitoring circuits placed throughout the system to detect and amplify RF or audio frequency signals received at any number of selected points. The dete ...


3
David S McVoy: Code operated switching device for communications systems and the like. Coaxial Scientific Corporation, Olson Trexler Wolters Bushnell & Fosse, February 3, 1976: US03936747 (3 worldwide citation)

The embodiment of the invention disclosed herein is directed to a code operated switching device having a receiver for handling RF frequencies in a superheterodyne fashion without the need of local oscillators, or the like at the receiver. Input means is provided for receiving first and second RF fr ...


4