Application of Cortical Processing Theory to Acoustical Analysis
Abstract
The overall goal of the STTR program is to formulate a template-matching operation, with perception-related rules of integration over time and frequency at its core, in the context of human perception of degraded speech. In particular, we aim at developing models of auditory processing capable of predicting consonant confusion by normally-hearing listeners, under a variety of acoustic distortions A prerequisite is to formulate the signal processing principles realized by the auditor periphery in providing the observed graceful degredation of human performance in noise. In the nominal four quarters of Phase I we have focused on the role of the descending auditory pathway in regulating the operating point of the cochlea, resulting in auditory nerve (AN) representation of speech sounds that are less sensitive to changes in sustained background noise. A closed-loop model of the auditory periphery, with efferent-inspired feedback, ha been implemented that produces spectrograms of noisy speech that are more consistent with spectrograms of speech in quiet than are spectrograms produced by open-loop models of the auditory periphery.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 2005
- Accession Number
- ADA433312
Entities
People
- Louis Braida
- Messing
- Oded Ghitza