Modeling the Precedence Effect for Speech
The human auditory system is capable of perceiving the direction of a sound source despite reflections off of walls, ceiling and other interfering objects. This phenomenon, the precedence effect, has been previously modeled only for synthetic click stimuli. This paper presents a biologically plausible computer simulation for speech, that combines a cross-correlation model with an onset enhancement scheme. As part of the complete model, a novel onset enhancement method is described and implemented, based on adaptive prediction. The adaptive method is promising in its ability to enhance onsets and reduce the steady state portion of the speech signal. The model can serve as a tool to understand the precedence effect for complex signals and should be advantageous to engineering applications such as preprocessors for speech recognition systems.
KeywordsSpeech Signal Sound Source Adaptive Filter Precedence Effect Interaural Time Difference
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- Blauert J. Spatial Hearing + supplement. MIT Press, Cambridge, MA, 1983.Google Scholar
- Clarkson R Optimal and Adaptive Signal Processing. CRC Press, Boca Raton, FL, 1993.Google Scholar
- Haas H. The influence of a single echo on the audibility of speech. Acoustica, 1: 49–58, 1951.Google Scholar
- Jeffress L.A. A place theory of sound localization. J. Comp Physiol. Psychol., 61: 468–486, 1947.Google Scholar
- Schwartz O. Modeling the precedence effect for speech. Master’s thesis, University of Florida, Gainesville, FL, 1996.Google Scholar
- Slaney M. An efficient implementation of the patterson and holdworth auditory filter bank. Apple Technical Report 35, 1993.Google Scholar
- Smith L.M. Onset based sound segmentation. Journal of New Music Research, November 1993.Google Scholar
- Zurek P. M. Directional Hearing. Springer-Verlag, New York, 1987.Google Scholar