## ISCA Tutorial and Research Workshop on Statistical and Perceptual Audio Processing## ICC Jeju, Korea |

(2) IDIAP Research Institute, Martigny, Switzerland

The temporal trajectories of the spectral energy in auditory critical bands over 250 ms segments are approximated by an all-pole model, the time-domain dual of conventional linear prediction. This quarter-second auditory spectro-temporal pattern is further smoothed by iterative alternation of spectral and temporal all-pole modeling. Just as Perceptual Linear Prediction (PLP) uses an autoregressive model in the frequency domain to estimate peaks in an auditory-like short-term spectral slice, PLP2 uses all-pole modeling in both time and frequency domains to estimate peaks of a two-dimensional spectrotemporal pattern, motivated by considerations of the auditory system.

__Bibliographic reference.__
Athineos, Marios / Hermansky, Hynek / Ellis, Daniel P. W. (2004):
"PLP-squared: autoregressive modeling of auditory-like 2-d spectro-temporal patterns",
In *SAPA-2004*, paper 129.