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A shotgun microphone comports a waste of time for covering all the directions on the hemisphere, changing more than one point of measure inside the theatre. For this reason we tried with a different approach employing a microphone array.
In particulr we used an Eigenmike probe from mhAcoustics.
It is made of 32 capsules, pre amplifiers and A/D converters packed inside the sphere. All the signals…
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The idea is to synthetize 32 directive virtual microphones in the direction of the capsules employing a set of digital filters.
We have 32  signals coming from the capsules and we desire 32 signals yielding the virtual microphones: so we need a bank of MxV FIR filters.
The convolution of the inputs with the filters gives as output the virtual microphone.
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ALLA FINE della SLIDE:
“all the informations about the processing are availble in our previous paper presente at the past AES Conference in Tokio”
----- Note riunione (5/10/11 15:02) -----
7 minuti
With a Matlab script we can perform the matrix inversion
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The aim of the post processing is a movie representing the behaviour of the sound through a polar plot of the sound levels in the horizontal plane and a mesh map of the levels on a 360°x180° picture of the room.
At first we import the wav files containing the Impulse Responses obtained from the 32 virtual microphones.
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[SUI DISEGNI]
For the horizontal polare we synthesize 24 virtual microphones and for the 3D map we created 32 virtual microphones in the direction of the capsules.
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