Title :
Technique for broadband correlated interference rejection in microphone arrays
Author_Institution :
Telecommun. Eng. Group, Australian Nat. Univ., Canberra, ACT, Australia
fDate :
7/1/1998 12:00:00 AM
Abstract :
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
Keywords :
acoustic correlation; acoustic transducer arrays; array signal processing; frequency-domain analysis; interference (signal); interference suppression; microphones; speech processing; adaptive beamformers; broadband correlated interference rejection technique; broadband minimum variance beam-forming; frequency domain averaging; frequency-invariant beam-forming; hands-free speech acquisition; microphone arrays; room reflections; signal cancellation problem; Adaptive arrays; Array signal processing; Covariance matrix; Frequency domain analysis; Interference cancellation; Microphone arrays; Optical reflection; Power generation; Sensor arrays; Speech;
Journal_Title :
Speech and Audio Processing, IEEE Transactions on
