Microphones arrays are employed to make measurements or recordings taking in account the spatial properties of sound. Here the attention is focused on planar array oriented to acoustic mapping, which have a particular interest in industrial and environmental acoustics, although musical and audio applications are directly involved. A Beam Forming theory overview is proposed first, with a light study of array spatial resolution, theory which holds a physical base which no algorithm can deny. Than a new algorithm, basing on Kirkeby multi-channel inversion, is proposed. Comparison between multi-channel inversion and Beam Forming are made through simulations, with good news pro the new method.
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