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AM-FM Demodulation of Spectrograms Using Localized 2D Max-Gabor AnalysisTony Ezzat, Jake Bouvrie, Tomaso PoggioCenter for Biological and Computational Learning (CBCL) & McGovern Institute for Brain Research Massachusetts Institute of Technology Cambridge, MA link to paper: (pdf) |
AbstractWe present a method that de-modulates a narrowband magnitude spectrogram S(f,t) into a frequency modulation term cos(phi(f,t)) which represents the underlying harmonic carrier, and an amplitude modulation term A(f,t) which represents the spectral envelope. Our method operates by performing a two-dimensional local patch analysis of the spectrogram, in which each patch is factored into a local carrier term and a local amplitude envelope term using a Max-Gabor analysis. We demonstrate the technique over a wide variety of speakers, and show how the spectrograms in each case may be adequately reconstructed as S(f,t) = A(f,t) cos(phi(f,t)). |
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AM-FM Demodulation of Spectrograms Using Localized 2D Max-Gabor Analysis Tony Ezzat, Jake Bouvrie, and Tomaso Poggio, to appear, ICASSP, Hawaii, 2007. (pdf)