Technique for broadband correlated interference rejection in microphone arrays

A new technique for broadband minimum variance beam-forming is presented that overcomes the signal cancellation problem of conventional adaptive beamformers in the presence of correlated interference. Specifically, frequency-invariant beam-forming is used to perform frequency domain averaging, thereby reducing the correlation between the desired signal and the interference. Such a technique is useful for hands-free speech acquisition using a microphone array, since correlated interference will be present due to room reflections.

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