ABSTRACT
An ideal pressure microphone responds only to sound pressure, with no regard for the directional bearing of the sound source; as such, the microphone receives sound through a single active opening. In reality, a pressure microphone exhibits some directionality along its main axis at short wavelengths, due principally to diffraction effects. As we saw in Figure 2-12, only as the received wavelength approaches the circumference of the microphone diaphragm does the microphone begin to depart significantly from omnidirectional response. For many studio-quality pressure microphones, this becomes significant above about 8 kHz.
