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Patent US6470214B1 – Method Device for Implementing the Radio Frequency Hearing Effect
Abstract
A modulation process with a fully suppressed carrier and input preprocessor filtering to produce an encoded output; for amplitude modulation (AM) and audio speech preprocessor filtering, intelligible Subjective Sound is produced when the encoded signal is demodulated using the radio frequency hearing effect. Suitable forms of carrier suppressed modulation include Single Sideband (SSB) and Carrier Suppressed Amplitude Modulation (CSAM) With both Sidebands present.
Patent US6470214B1, titled “Method and device for implementing the radio frequency hearing effect,” is a 1996-filed patent granted on October 22, 2002, to James P. O’Loughlin and Diana L. Loree of the U.S. Air Force. The invention describes a system for transmitting intelligible audio, specifically speech, directly to a human subject by modulating an audio signal onto a radio frequency (RF) carrier.
The Air Force technology exploits the radio frequency (RF) Hearing Effect (also known as the Frey effect or microwave auditory effect), a phenomenon where pulsed radio frequency (RF) energy causes thermoelastic expansion in the head’s tissue. This rapid, localized heating creates pressure waves that travel through the bone and tissue to the inner ear, where they are processed by the cochlea and perceived as sound without the use of traditional acoustic transducers like speakers or earphones.
This patent is part of a series of Air Force research efforts into directed energy communications, including a related 2003 Patent US6470214B1 for an apparatus to audibly communicate speech using this effect.
