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Sound meter microphone

Discussion in 'Electronic Basics' started by fred, Feb 1, 2004.

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  1. fred

    fred Guest

    Is there any particular reason why sound level
    meters have some sort of housing for the
    electret. Is it a cosmetic thing so that people
    will know where to point with the meter, or is
    supposed to prevent sound from entering into
    the microphone from the sides or from inside the
    plastic box ?
     
  2. Ben Bradley

    Ben Bradley Guest

    I suspect the mic in suc a meter is omnidirectional, and it doesn't
    matter which way you point it.
    The electret mic element is not only "out separate" from the case,
    that area of the case is rounded like a cone, rather than just being a
    short cylinder connected to a rectangular case. Older sound level
    meters used to be made that way.
    The problem with the old design is that sound would bounce off the
    meter housing and back into the mic as well as being picked up
    directly. Depending on the length between the main housing and the mic
    and the frequency, the original and reflected waves would add
    constructively (causing a higher reading than it would otherwise
    have), or destructively (causing a lower reading). The modern design
    prevents sounds reflected from the housing from being picked up by the
    mic.
     
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