yeah I know Gwen was. They just wrapped her up into another label and hid her existence again. I can't remember the new name they gave her.
On Aug 12, 2:15 am, Trev <[email protected]> wrote: > PS: Gwen has been superceded in 1999 > afaik-http://en.wikipedia.org/wiki/Ground_Wave_Emergency_Network > and replaced by a new system. > The old data was on this site http://www.fas.org/nuke/guide/usa/c3i/gwen.htm > and could give an indication of the end product, as was. > > On Aug 12, 10:01 am, Trev <[email protected]> wrote: > > > > > It could be, I have seen this before, and it could be used in an > > inverse stereo or target mode BUT the transmissions would still be > > obvious unless using something exotic like satellite directed lasers > > and local transponders &/or implants of some kind, which would also > > then be physically aparrent. > > Such a device would hardly be wasted on humming at people -and also > > risk questions being asked at the minimum! > > It would also be resisted by shielding / not being line of sight, or > > target being underground. > > This effect would explain sensitivity to carrier switched microwave > > systems like Tetra but this is mood affecting outcome, as a by product > > [and worrying too!], but not something that would be heard, ocurring > > <20 Hz in UK.. > > Not sure about GWEN in the states though. > > I'm looking into getting old data from a defunct site- but suspect > > this will be another 'side effect' issue rather than anything malign- > > but certainly worth a look.. > > > On Aug 12, 7:12 am, dboots <[email protected]> wrote: > > > >http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=P... > > > > United States Patent 6,470,214 > > > O'Loughlin , et al. October 22, 2002 > > > > -------------------------------------------------------------------------------- > > > Method and 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 RF Hearing Effect. Suitable forms of carrier suppressed > > > modulation include single sideband (SSB) and carrier suppressed > > > amplitude modulation (CSAM), with both sidebands present. > > > > -------------------------------------------------------------------------------- > > > Inventors: O'Loughlin; James P. (Placitas, NM), Loree; Diana L. > > > (Albuquerque, NM) > > > Assignee: The United States of America as represented by the Secretary > > > of the Air ( > > > (Washington, DC) > > > > Appl. No.: 08/766,687 > > > Filed: December 13, 1996 > > > > -------------------------------------------------------------------------------- > > > > Current U.S. Class: 607/56 ; 128/898 > > > Current International Class: A61N 1/08 (20060101); H04B 007/00 () > > > Field of Search: 607/55,56 600/559,23,586 128/897,898 > > > > -------------------------------------------------------------------------------- > > > > References Cited [Referenced By] > > > > -------------------------------------------------------------------------------- > > > > U.S. Patent Documents > > > > 3563246 February 1971 Puharick > > > 3629521 December 1971 Puharick > > > 4835791 May 1989 Daoud > > > > Primary Examiner: Schaetzle; Kennedy > > > Attorney, Agent or Firm: Skorich; James M. Callahan; Kenneth E. > > > > STATEMENT OF GOVERNMENT INTEREST > > > > The invention described herein may be manufactured and used by or for > > > the Government for governmental purposes without the payment of any > > > royalty thereon. > > > > 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 pulsed carrier modulation can induce a subjective > > > sensation for simple tones, it severely distorts the complex waveforms > > > of speech, as has been confirmed experimentally. > > > > The presence of this kind of distortion has prevented the click > > > process for the encoding of intelligible speech. An example is > > > provided by AM sampled data modulation. > > > > Upon demodulation the perceived speech signal has some of the envelope > > > characteristics of an audio signal. Consequently a message can be > > > recognized as speech when a listener is preadvised that speech has > > > been sent. However, if the listener does not know the content of the > > > message, the audio signal is unintelligible. > > > > The attempt to use the click process to encode speech has been based > > > on the assumption that if simple tones can be encoded, speech can be > > > encoded as well, but this is not so. > > > > A simple tone can contain several distortions and still be perceived > > > as a tone whereas the same degree of distortion applied to speech > > > renders it unintelligible. > > > > SUMMARY OF THE INVENTION > > > > In accomplishing the foregoing and related object the invention uses > > > a. modulation process with a fully suppressed carrier and pre- > > > processor filtering of the input to produce an encoded output. Where > > > amplitude modulation (AM) is employed and the pre-processor filtering > > > is of audio speech input, intelligible subjective sound is produced > > > when the encoded signal is demodulated by means of the RF Hearing > > > Effect. Suitable forms of carrier suppressed modulation include single > > > sideband (SSB) and carrier suppressed amplitude modulation (CSAM), > > > with both sidebands present. > > > > The invention further provides for analysis of the RF hearing > > > phenomena based on an RF to acoustic transducer model. Analysis of the > > > model suggests a new modulation process which permits the RF Hearing > > > Effect to be used following the transmission of encoded speech. > > > > In accordance with one aspect of the invention the preprocessing of an > > > input speech signal takes place with a filter that de-emphasizes the > > > high frequency content of the input speech signal. The de-emphasis can > > > provide a signal reduction of about 40 dB (decibels) per decade. > > > Further processing of the speech signal then takes place by adding a > > > bias level and taking a root of the predistorted waveform. The > > > resultant signal is used to modulated an RF carrier in the AM fully > > > suppressed carrier mode, with single or double sidebands. > > > > The modulated RF signal is demodulated by an RF to acoustic > > > demodulator that produces an intelligible acoustic replication of the > > > original input speech. > > > > The RF Hearing Effect is explained and analyzed as a thermal to > > > acoustic demodulating process. Energy absorption in a medium, such as > > > the head, causes mechanical expansion and contraction, and thus an > > > acoustic signal. > > > > When the expansion and contraction take place in the head of an > > > animal, the acoustic signal is passed by conduction to the inner ear > > > where it is further processed as if it were an acoustic signal from > > > the outer ear. > > > > The RF to Acoustic Demodulator thus has characteristics which permit > > > the conversion of the RF energy input to an acoustic output. > > > > Accordingly, it is an object of the invention to provide a novel > > > technique for the intelligible encoding of signals. A related object > > > is to provide for the intelligible encoding of speech. > > > > Another object of the invention is to make use of the Radio Frequency > > > ("RF") Hearing Effect in the intelligible demodulation of encoded > > > signals, including speech. > > > > Still another object of the invention is to suitably encode a pulsed > > > RF carrier with an amplitude modulated ("AM") envelope such that the > > > modulation will be intelligibly demodulated by means of the RF Hearing > > > Effect. A related object is to permit a message to be identified and > > > understood as speech when a listener does not know beforehand that the > > > message is speech. > > > > Other aspects of the invention will become apparent after considering > > > several illustrative embodiments, taken in conjunction with the > > > drawings. > > > > 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 > > > second output signal a(t)As(f)+A; applying the second output signal to > > ... > > read more »- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. 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