Independent component analysis, a new concept?
Signal Processing - Special issue on higher order statistics
Learning Overcomplete Representations
Neural Computation
Activity index variance as an indicator of the number of signal sources
WSEAS Transactions on Signal Processing
A tool for the simulation of the activity index variance model
CSECS'08 Proceedings of the 7th conference on Circuits, systems, electronics, control and signal processing
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Speech process has benefited a great deal from the wavelet transforms. Wavelet packets decompose signals in to broader components using linear spectral bisecting. In this paper, mixtures of speech signals are decomposed using wavelet packets, the phase difference between the two mixtures are investigated in wavelet domain. A geometrical model is defined and an adaptive algorithm is proposed based on phase difference parameter in wavelet domain. Speech signals are separated from mixtures in an overcomplete-case.