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AM-FM DEMODULATION OF SPECTROGRAMS USING LOCALIZED 2D MAX-GABOR ANALYSIS
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BibTeX
@MISC{Ezzat_am-fmdemodulation,
author = {Tony Ezzat and Jake Bouvrie and Tomaso Poggio},
title = {AM-FM DEMODULATION OF SPECTROGRAMS USING LOCALIZED 2D MAX-GABOR ANALYSIS},
year = {}
}
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Abstract
We present a method that de-modulates a narrowband magnitude spectrogram S(f, t) into a frequency modulation term cos(φ(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(φ(f, t)). Index Terms — speech analysis, spectral analysis, timefrequency analysis, modulation 1.
Keyphrases
max-gabor analysis am-fm demodulation spectrogram using localized index term spectral envelope frequency modulation term co local amplitude wide variety amplitude modulation term local carrier term two-dimensional local patch analysis timefrequency analysis spectral analysis narrowband magnitude spectrogram harmonic carrier
