Problem:
It would be a dream of every microphone array researcher to have a mic array with a size of a matchbox. Unfortunately this is not a case, and many mic arrays are of a size of hundreds of cm. This size restriction comes from the frequency of the signal we are trying to catch with the array: the lower the frequency the bigger the array must be.
Possible Solution:
if the array size depends on the wavelength, and we can NOT change the frequency of the signal under acquisition, what can we affect in order to use smaller arrays? The guess is right: the speed of sound.
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