Post-microphone-array speech enhancement with adaptive filters for forensic application

A multi-microphone speech enhancement system including two stages of processing has been developed. In the first stage, the array is aimed at the desired signal source and the noise signal source(s) respectively by means of the Frost algorithm or DS beamforming. In the second stage, the difference between the SNRs of the array outputs are employed to improve the SNR of the desired signal further by an adaptive filter with MRSS (matrix ratio sub space) algorithm. This algorithm is based on the orthogonal and coincidental subspace eigen analysis. The mathematical derivation and the simulation results that illustrate the advantages of the system are presented.<
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