Audio signal separation device and method thereof

Details Audio signal separation device and method thereof Audio signal separation device and method thereof

2006-06-01

2010-10-05

Kuntz, Curtis (Department: 2614)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

C704S203000

Reexamination Certificate

active

07809146

ABSTRACT:
Problems of permutation can be solved with high accuracy without utilizing knowledge about original signals or information concerning positions of microphones and the like when each one of plural signals mixed in an audio signal is separated using independent component analysis. A short-time Fourier transformation section generates spectrograms of observation signals from observation signals in time domain. A signal separation section separates the spectrograms of the observation signals into spectrograms of respective signals, to generate spectrograms of separate signals. A permutation problem solution section calculates a scale corresponding to the degree of permutation, e.g., a Kullback-Leiblar information amount calculated by use of a multidimensional probability density function or multidimensional kurtosis, from substantial whole of the spectrograms of the separate signals. Based on the scale, signals at each of frequencies bin of the spectrograms of the separate signals are exchanged between channels, to solve the permutation problem.

REFERENCES:
patent: 7647209 (2010-01-01), Sawada et al.
patent: 2008/0208570 (2008-08-01), Nam
patent: 2009/0222262 (2009-09-01), Kim et al.
patent: 2004-126198 (2004-04-01), None
patent: 2004-145172 (2004-05-01), None
Sawada et al, “A Robust and Precise Method for Solving the Permutation Problem of Frequency-Domain Blind Source Separation”, IEEE Transactions on Speech and Audio Processing, vol. 12, No. 5, Sep. 2004, pp. 530-538.

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