title: Consistency among speech parameter vectors: application to predicting speech intelligibility.
abstract: Previous researchers interested in physical assessment of speech intelligibility have largely based their predictions on preservation of spectral shape. A new approach is presented in which intelligibility is predicted to be preserved only if a transformation modifies relevant speech parameters in a consistent manner. In particular, the parameters from each short-time interval are described by one of a finite number of symbols formed by quantizing the output of an auditory model, and preservation of intelligibility is modeled as the extent to which a one-to-one correspondence exists between the symbols of the input to the transformation, and those of the output. In this paper, a consistency-measurement system is designed and applied to prediction of intelligibility of linearly filtered speech and speech degraded by additive noise. Results were obtained for two parameter sets: one consisting of band-energy values, and the other based on the ensemble interval histogram (EIH) model. Predictions within a class of transformation varied monotonically with the amount of degradation. Across classes of transformation, the predicted effect of additive-noise transformations was more severe than typical perceptual effects. With respect to the goal of achieving predictions that varied monotonically with human speech-perception scores, performance was slightly better with the EIH parameter set.
authors.affiliation: Massachusetts Institute of Technology, Cambridge 02139-4307, USA.
authors.forename: M H
authors.initials: MH
authors.lastname: Power
authors.forename: L D
authors.initials: LD
authors.lastname: Braida
mesh_terms: D001309:Auditory Threshold; D006801:Humans; D009622:Noise; D010470:Perceptual Masking; D010700:Phonetics; D013067:Speech Perception