Abstract
A method is proposed for angular filtering for a selected normal mode by means of a steered array. Examples are given for spatial filtering by a single angle of sight and by association of the symmetrical angle of sight. Calculations were made for the particular case corresponding to previous experiments. Identity between the spatial filtering by amplitude shading with functions of one of the normal modes and by electronic steering with phase-shifters is demonstrated. Possibilities for modal spectroscopy and adaptive filtering are investigated.
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