Recent content by tonyjeffs

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    Detecting the existence of a sound that has been lost in thermal noise

    GTrax, Are the "beats" caused by the sound pressure waves from one source messing with the vibrations of the other source in a non-linear way? .. or do the waves arrive and mix and interfere with each other producing "beats", as opposed to simply adding in pure fashion? Here's a fairly obvious...
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    Detecting the existence of a sound that has been lost in thermal noise

    Gtrax That's a good, controlled, experiment you did. In virtually all the related professional research I've read on the topic, control is woefully inadequate imo. Are you fairly confident that your 8k tinnitus is a fairly pure tone? You would of course still get a beat frequency if it is...
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    Detecting the existence of a sound that has been lost in thermal noise

    Sorry, I think I messed up by mentioning my friend's tinnitus as it has taken us off topic, and detracted from the physics question I wanted to consider. The question is really "Is there any way of detecting a sound that cannot be heard". An example of an answer might be "Yes, if you can see...
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    Detecting the existence of a sound that has been lost in thermal noise

    Suppose there is a quit sound inside the centre of a spherical box. the sound is so quiet that it cannot carry beyond the surface of the box. - at that distance from the source it is much quieter than the natural thermal noise of the box. It cannot be heard with even a perfect microphone...
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    Detecting the existence of a sound that has been lost in thermal noise

    Hi Evo, I have been heavily involved with tinnitus charities and personally with some of the researchers in the field. The people involved largely overlap and understandably interact and know each other. Generally the medical-science approach is to describe it as neurological, and that flows...
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    Detecting the existence of a sound that has been lost in thermal noise

    Berkeman, I am thinking along the lines of a noisy stray capilliary, that has grown in the wrong place. Something much smaller than (what I'd think of as) an anneurysm. Maybe it could even be the normal surface noise of a tiny blood vessel ,ordinarily inaudable, but in this case so close to...
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    Detecting the existence of a sound that has been lost in thermal noise

    ultra sensitive microphone or technique for listening to inner ear A friend has very loud tinnitus. He says it is constantly louder than anything else he can hear. Nothing can be heard by an independant observer such as myself, but it is possible that a sound with a small power level is so...
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    Software to make line graph, Like Excel?

    Gnuplot does the trick. Matlab - £3,000. The opposite of free! Many thanks Tony
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    Software to make line graph, Like Excel?

    Is there any software that will convert a series of numbers into a simple line graph, the same as Excel, but allowing me to use a lot more numbers? I'm writing a program in c to convert a sinewave, or any wave, into a triangular wave. I've sort of done it, but there is noise in my...
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    Cant spot flaw in nested logic in puzzle

    Yes you got the idea :-) And I understand what you're saying, but although it obviously is invalid, I still don't really see why "perception of perception of perception" becomes invalid. "Perception is valid." (Angus thinks...) "Perception of perception" is valid (Angus thinks that Ben...
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    Cant spot flaw in nested logic in puzzle

    Each dragon can see all three other dragons. They can all see each other. They all have green eyes. None of the dragons know this since they don't know their own eye colour. Each dragon can therefore see 3 pairs of green eyes. There are no possible colours besides green and brown. Consider...
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    Cant spot flaw in nested logic in puzzle

    This is not a puzzle question exactly. It's a question about logic that the puzzle illustrates. There are four dragons. It is known that dragons can have brown eyes but our four all have green eyes. They can see each others eyes, but don't know their own eye colour. They will turn into...
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    Evolution -How many times did life begin on earth

    Hi Chemisttree, wow some strongly expressed views :-) Good points though. I imagine that suddenly the conditions were just right, and the same chemical reaction giving rise to life happened simultaneously in a lot of places, and all these life-molecules were able to interact. But I'd...
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    Evolution -How many times did life begin on earth

    It's a good theory though. Perhaps, once the first 'life' had evolve, it spread around the globe very quickly and adopted its position of dominance. The reason I was wondering is: If we could show that life started more than once on Earth, it'd suggest that extra-terrestrial life is more...
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    Evolution -How many times did life begin on earth

    I get the impression that all life on earth, including extinct life, goes back to the same single common source. Is this the general view? Or could life have started out independantly at different times and/or places. If so is there any evidence? Tony
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