Andy's Hearing Sandbox

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  1. Is tinnitus just fibrilation of hairs? We "hear" a sound -- an annoying hiss, at high frequency, say; is that hairs activating nerves, or is that nerves imagining hair activation?

    If it's hairs fibrilating, could we construct a defibrilator? Could we give those hairs a shock back to normalcy?

  2. Question:
    (From this site:)

    Loudness of a sound is proportional to the square of the amplitude of the vibration producing the sound. Explain.

    The loudness of sound depends on the amplitude of vibration of the vibrating object. Greater the amplitude of vibration, louder the sound will be.

    When a Sitar string is plucked lightly, then it vibrates with a small amplitude and produces a faint sound or feeble sound. When a sitar string is plucked hard, then it vibrates with a large amplitude and produces a very loud sound.

    The loudness of sound is directly proportional to the square of the amplitude of vibration.

    If the amplitude of vibration is doubled, then the loudness will become 4 times.

    If the amplitude of vibration is halved, then the loudness will become one-fourth.

    The loudness of sound is expressed in the units called the Decibel. The symbol of the decibel is Db.

    At a loudness of above 80 Db, the sound become physically painful. And at about 140 Db level, the sound hurts too much.

  3. Mathematica
  4. Decibel -- a tenth of a Bel, of course!:)

    The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 101/10 (approximately 1.26) or root-power ratio of 101⁄20 (approximately 1.12).


    Two principal types of scaling of the decibel are in common use. When expressing a power ratio, it is defined as ten times the logarithm in base 10.[5] That is, a change in power by a factor of 10 corresponds to a 10 dB change in level. When expressing root-power quantities, a change in amplitude by a factor of 10 corresponds to a 20 dB change in level. The decibel scales differ by a factor of two, so that the related power and root-power levels change by the same value in linear systems, where power is proportional to the square of amplitude.

  5. Joe's suggestions:
  6. I did a search for Mathematica and hearing tests, and found a few interesting articles:

  7. Went looking for Mathematica synthesizers, and
  8. Encylopedia Britanica has a good article on sound

  9. I’d said I’d look into analysis for python and R: here are some early looks

  10. Soundmagic Spectral:
    • "SoundMagic Spectral is a freeware suite of 23 Audio Unit plug-ins that implement real-time spectral processing of sound. This set of effects give you unprecedented control and creativity in the processing of audio, whether from static audio files or live audio streams."
    • Only for the Mac at this time...:(