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Title: Ultrasonic speech translator and communications system

A wireless communication system undetectable by radio frequency methods for converting audio signals, including human voice, to electronic signals in the ultrasonic frequency range, transmitting the ultrasonic signal by way of acoustical pressure waves across a carrier medium, including gases, liquids, or solids, and reconverting the ultrasonic acoustical pressure waves back to the original audio signal. The ultrasonic speech translator and communication system includes an ultrasonic transmitting device and an ultrasonic receiving device. The ultrasonic transmitting device accepts as input an audio signal such as human voice input from a microphone or tape deck. The ultrasonic transmitting device frequency modulates an ultrasonic carrier signal with the audio signal producing a frequency modulated ultrasonic carrier signal, which is transmitted via acoustical pressure waves across a carrier medium such as gases, liquids or solids. The ultrasonic receiving device converts the frequency modulated ultrasonic acoustical pressure waves to a frequency modulated electronic signal, demodulates the audio signal from the ultrasonic carrier signal, and conditions the demodulated audio signal to reproduce the original audio signal at its output. 7 figs.
Inventors:
; ;
Issue Date:
OSTI Identifier:
264570
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 426000; PA: EDB-96:122062; SN: 96001625903
Patent Number(s):
US 5,539,705/A/
Application Number:
PAN: 8-329,889
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 23 Jul 1996
Research Org:
Lockheed Martin Energy Syst Inc
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; COMMUNICATIONS; ELECTRONIC EQUIPMENT; DESIGN; SPEECH SYNTHESIZERS; ULTRASONIC WAVES; FREQUENCY MODULATION; RADIO EQUIPMENT; DETECTION