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Abstract

Automatic ringing/howling sound suppression from feedback or over amplifications in live performances is described An off-line approach to determine the major ring modes in the 'room' is used, wherein narrow-band digital filters are used to attenuate the offending signals. Using high Q, highly stable digital filters, continuous control over these major ring nodes can be obtained. After an initial hunt is performed for the ring nodes through the use of ring node excitation signals, the first ring nodes or major ring nodes are attenuated to a increased level to improve the sound system's dynamic range. The excitation signal's level is controlled while it is injected to excite and detect the ring nodes of the room in a sequential manner. Filter parameters are created based on the location of the ring node(s) in the frequency spectrum and the required attenuation to eliminate it, resulting in an improved performance experience and yet controlling the detrimental aspects due to the acoustics.

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First Claim