Testing for periodicity in speech waveforms.
Betul Arda, Daniel Rudoy, Patrick J. Wolfe · The Journal of the Acoustical Society of America · 2009
Speech waveform segments can roughly be categorized as voiced or unvoiced, in accordance with periodicity properties of the glottal source, and inferring this classification from data is in turn an important task underlying a variety of speech classification problems. This presentation describes a formal hypothesis testing framework for the detection of periodicity in general acoustic sources, with application to online voiced/unvoiced segmentation of speech signals. Beginning with the classical approach of Fisher, a variety of test statistics are proposed and analyzed in this context. Asymptotic analyses are provided, along with simulations to demonstrate the efficacy of such methods in the presence of compound periodicities, harmonic structure, and the low signal-to-noise-ratio environments typical of real-world speech applications. [Work supported in part by DARPA, NGA, and NSF.]