EUROSPEECH 2003 - INTERSPEECH 2003
In this paper, we introduce new dynamic speech features based on the modulation spectrum. These features, termed Mel-cepstrum Modulation Spectrum (MCMS), map the time trajectories of the spectral dynamics into a series of slow and fast moving orthogonal components, providing a more general and discriminative range of dynamic features than traditional delta and acceleration features. The features can be seen as the outputs of an array of band-pass filters spread over the cepstral modulation frequency range of interest. In experiments, it is shown that, as well as providing a slight improvement in clean conditions, these new dynamic features yield a significant increase in speech recognition performance in various noise conditions when compared directly to the standard temporal derivative features and RASTA-PLP features.
Bibliographic reference. Tyagi, Vivek / McCowan, Iain A. / Bourlard, Hervé / Misra, Hemant (2003): "On factorizing spectral dynamics for robust speech recognition", In EUROSPEECH-2003, 981-984.