Patent ID: 9654229
Date: 2017-05-16
CPC Classifications: H04B

Claim:
1. A method, comprising: directing an ultrasonic carrier signal towards a person's neck; receiving, at an ultrasonic microphone, a frequency modulated ultrasonic signal comprising an audio signal made up of vibrations representative of the person's speech; wherein the frequency modulated ultrasonic signal is linearly modulated at the person's neck, the ultrasonic carrier signal being linearly modulated with vibrations occurring at the surface of the person's neck, the vibrations being caused by the person's vocal cords during speech, inducing a frequency shift in the ultrasonic carrier signal based on the vibrations as it is reflected off of the person's neck; tuning a demodulator to a frequency associated with the ultrasonic carrier signal; and demodulating the frequency modulated ultrasonic signal based on the frequency associated with the ultrasonic carrier to retrieve the audio signal.