Ultrasonic remote control system (US Patent 4064806)

Patent number: 4064806 Granted: 1977-12-27 Filed: 1976-09-01 Inventors: Maurice Apstein (Bethesda, MD, US); Henry P. Kalmus (Washington, DC, US) Assignees: The United States of America as represented by the Secretary of the Army (Washington, DC, US)

Abstract

Transmission of control information from one location in a solid structure o one or more remote locations in that structure is accomplished with ultrasonic surface waves transmitted along the structure. The ultrasonic carrier is frequency-modulated to cause the resulting