Problem:
It is the dream of every microphone array researcher to have a mic array with a size of only a matchbox. Unfortunately, until now 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. But not any more…
101 – Miniature Microphone Array
102 – Main Enclosure
103 – Sensor array, Microphone Array
104 – Sensors, Microphones
105 – Air
106 – Media: Argon, Krypton, Xenon, Sulfur Hexafluoride, Carbon Dioxide, etc.
The 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.
Patents:
EP2218267: Kubin, Kepesi, Stark: Housing for Microphone Arrays and Multi-Sensor Devices for Their Size-Optimization, and
US8767993 (B2): Kubin, Kepesi, Stark: Housing for Microphone Arrays and Multi-Sensor Devices for Their Size-Optimization.
Signal Processing Ideas 
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