Microphones and miking techniques - PZM microphones

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A pressure zone is a space which is made of highly reflecting surfaces. As a result, in proximity to a pressure zone the sound field is almost doubled, it being made up of the incident wave as well as the reflected wave. The pressure zone's dimension is 1/6th that of the wave-length, since in order to obtain a reinforcement of the sound field it is necessary for the incident and reflected waves to be in phase. PZM microphones are fixed to appropriate horizontal plates and are positioned within the pressure zone. So, for a composite signal extended over a frequency-range going from 20 Hz to 20 KHz, we'd have to take into account the highest frequency level in order to find the ideal spot for positioning the microphone. With a 20 KHz frequency we'd place the microphone at less than 2.88 mm from the reflecting surface. Regardless of the diaphragms' reduced dimensions, PZM microphones give a good response to low frequencies.

The polar pattern is very wide and has a hemispherical shape:

Microphones and miking techniques - Polar pattern of a PZM microphone

Polar pattern of a PZM microphone


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