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Question about microphones

Discussion in 'Electronic Basics' started by Guest, Aug 10, 2003.

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  1. Guest

    Guest Guest

    If I increase the sound level into an electret microphone by x db's
    will the output voltage from the microphone increase by x db's
    as well ?
     
  2. Bill Bowden

    Bill Bowden Guest

    Sound level is power level, and power is a function of
    voltage squared, so if sound level goes up by 2X or 3dB, the
    output voltage of the microphone goes up by the square root
    of 2 = (1.414). So, if you have say 4 millivolts of mic output
    from some sound level and then double the sound level (+3dB),
    the output voltage will be 1.414 times 4 = 5.7 millivolts.

    -Bill
     
  3. John Larkin

    John Larkin Guest

    Yes, until the sound is so loud it saturates the mic.

    John
     
  4. Terry

    Terry Guest

    Agree and to add.

    Low sound: Sound too weak for the microphone to detect and
    respond. This would be a 'minimum' or 'threshold' sensitivity of
    the unit?

    Normal sound range: From quiet to loud. There will be some
    relationship, say logarithmic (decibels) between the sound input
    and the electrical power output of the microphone. Affected by
    many factors such as direction and closeness to the source of the
    sound etc. etc.

    The relationship between low and high sounds may be called the
    'Dynamic Range' of the microphone. It may vary with frequency.
    For example mics broadcasting an orchestral music concert may
    have a wide dynamic and a broad frequency range. The microphone
    in a telephone handset will probably be more limited.

    Very Loud: Sound input so loud that it exceeds the maximum output
    capability of the microphone; at that 'maximum' or 'saturation'
    point it doesn't matter how much louder the sound gets. It just
    isn't capable of turning any more sound power into electrical
    energy. Distortion may occur before reaching maximum output. This
    is sometimes evidenced when a performer or user "Swallows the
    mike" or yells into it at close range or when sometimes a mild
    'thump' is heard when a loud explosion has actually occurred.
     
  5. Guest

    Guest Guest

    I thought linearity is good ?
     
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