13.10 SOUND

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13.10.1 Microphones

Convert sound pressure to electrical signals

A microphone has a finite area to measure the sound with. As the diameter `d' approaches the wavelength of sound, the sound becomes distorted.

When wind blows across a microphone, it generates a low frequency turbulence noise. This is often corrected by using dBA measurements, and foam balls.

Corrections must also be made for changes in temperature and altitude