A new technique for the analysis of sPeeCh, the perceptual linear predictive (PLP) technique, is presented and examined. This technique uses three concepts from the psychophysics of hearing to derive an estimate of the auditory spectrum: ( 1 ) the critical-band spectral resolution, (2) the equal-loudness curve, and (3) the intensity-loudness power law. The auditory spectrum is then approximated by an autoregressive all-pole model. A 5th-order allpole model is effective in suppressing speaker-dependent details of the auditory spectrum. In .comparison with conventional linear predictive (LP) analysis, PLP analysis is more consistent with human hearing. The effective second formant F2' and the 3.5-Bark spectral-peak integration theories of vowel perception are well accounted for. PLP analysis is computationally efficient and yields a low-dimensional representation of speech. These prbpcrties are found to be useful in speaker-independent automatic-speech recognition.
The equal loudness curve and power law of hearing blocks are according to REF .
Perceptual linear predictive (PLP) analysis of speech
The Journal of the Acoustical Society of America
The Journal of the Acoustical Society of America
Physics Medicine