1.10 SOUND



1.10.1 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