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    Posted on August 25th, 2009 qbit No comments

    Patent 6470214
    Patent Information:  USPTO Site Listing
    Patent Number: 6470214
    Patent Title: Method and device for implementing the radio frequency hearing effect

    Issue Date: 10/22/2002
    Filed Date: 12/13/1996
    Serial #: 766687

    Assignee Name: The United States of America as represented by the Secretary of the Air (Washington, DC)
    Inventor(s): O’Loughlin, James P. , Loree, Diana L.
    Lab Information:  View Lab Profile
    Lab Name: Air Force TechMatch Patent Lab
    Location: 1000 Technology Drive
    Fairmont, WV 26554
    Contact: Contact Lab About This Patent

    Description:
    BACKGROUND OF THE INVENTION
    This invention relates to the modulating of signals on carriers, which are transmitted
    and the signals intelligibly recovered, and more particularly, to the modulation of
    speech on a carrier and the intelligible recover of the speech by means of the
    Radio Frequency Hearing Effect.
    The Radio Frequency (“RF”) Hearing Effect was first noticed during World War II as
    a subjective “click” produced by a pulsed radar signal when the transmitted power
    is above a “threshold” level. Below the threshold level, the click cannot be heard.
    The discovery of the Radio Frequency Hearing Effect suggested that a pulsed RF
    carrier could be encoded with an amplitude modulated (“AM”) envelope. In one
    approach to pulsed carrier modulation, it was assumed that the “click” of the pulsed
    carrier was similar to a data sample and could be used to synthesize both simple
    and complex tones such as speech. Although  . . . . More
    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 RF Hearing Effect. Suitable forms of
    carrier suppressed modulation include single sideband (SSB) and carrier
    suppressed amplitude modulation (CSAM), with both sidebands present.
    Claims:
    What is claimed is:
    1. A method of encoding an input audio signal a(t) to produce a double sideband
    output signal having a .omega..sub.c carrier frequency, which when transmitted to
    the head of a receiving subject, will by the radio frequency hearing effect induce a
    thermal-acoustic signal in the bone/tissue material of the head that replicates the
    input audio signal and is conducted by the bone/tissue structure of the head to the
    inner ear where it is demodulated by the normal processes of the cochlea and
    converted to nerve signals which are sent to the brain, thereby enabling intelligible
    speech to be perceived by the brain as any other nerve signal from the cochlea, the
    method comprising:
    applying an input audio signal a(t) to an audio pre-distortion filter with an As(f) filter
    function to produce a first output signal a(t)As(f);
    adding a very low frequency bias A to the first output signal to produce a s . . . .
    More

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