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A Novel Noise Suppression Algorithm Using a Very Small Microphone Array

This paper describes a new noise suppression algorithm using a small microphone array. It can be used to generate noise suppressed speech signals, e.g., in conference systems, hands-free mobile phones, and man-machine interfaces. The microphone array comprises three omnidirectional microphones, located very close to each other. Using digital signal processing, the directivity of the array is controlled to generate a noisy signal in which the speech signal is suppressed. This signal is then used as a noise reference for a noise reduction algorithm based on the well-known spectral subtraction (spectral weighting) method. As a result, a significant noise suppression is achieved, whereas musical noise and other distortions are kept to a minimum.:

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