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Recording audio (with maths)

Discussion in 'Electronic Design' started by martin griffith, May 21, 2005.

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  1. I'm a bit bored, nothing electronic happening, so to speak, but I
    found this via

    The new mathematical approach for recording with a microphone:

    The mike should be neither too close, nor too far from the sound
    source. A simple formula often used by professionals to calculate the
    optimum distance to the source, D, is given by:

    D = 4.72 x 10^-3 x (2pi/SV)[sin(M/T) - cos(M/2T)] dM/dt
    + e^[h(H'- H) sqrt(H/H')] x log (1/[SVT^2]) +/- msp


    * D = the desired distance in inches
    * H = height of the sound source in meters
    * H' = height of the mike in yards
    * V = max volume of the source in dBm
    * S = sensitivity of the mike in millivolts per dBm
    * T = mean temperature of the room in degrees Melvin
    * h = Plank's reasonably constant
    * M = arc tan (area of microphone diaphragm, in round mm)
    * and msp = mistake someplace, in watt-kilograms/hour.

    The best microphone for an accordion is none. (This rule-of-thumb also
    applies to bagpipes and rappers.)

    anyway there is a lot more on


    After the first death, there is no other.
    (Dylan Thomas)
  2. JeffM

    JeffM Guest

    The best microphone for an accordion is none.
    perfect pitch: n. throwing a rapper's microphone
    and getting it in the dumpster on the 1st try.
  3. Rich Grise

    Rich Grise Guest

    Is this what they call "audiophoolishness"?

    (Actually, I have a brother who's a "professional" "guitarist". He
    should get a charge out of it, so to speak. ;-)

  4. ...and to the Breton bombarde - but more so.
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