Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

A Theory of Asymmetric Intensity Enhancement Around Acoustic Transients

Irino Toshio (1), Roy D. Patterson (2)

(1) NTT Basic Research Laboratories, Kanagawa, Japan
(2) MRC - Applied Psychology Unit, Cambridge, UK

A theory of asymmetric intensity enhancement around acoustic transients is presented. Experiments with ramped and damped tones (Patterson 1994a,b) have shown that reversing an asymmetric envelope changes the timbre of the sound. A 'delta-gamma' filter with thresholding produces asymmetric intensity enhancement around transients that can explain the experimental results obtained with damped and ramped tones. If we assume that the onset of a sound is more important perceptually than what comes shortly thereafter, then this onset information can be enhanced by the delta-gamma process. Nonsimultaneous masking experiments were also performed but between subject variability precluded explanation by the delta-gamma theory.

Full Paper

Bibliographic reference.  Toshio, Irino / Patterson, Roy D. (1994): "A theory of asymmetric intensity enhancement around acoustic transients", In ICSLP-1994, 1955-1958.