A Robust Preprocessor for Speech-Recognition Systems
نویسنده
چکیده
• Deduced the mechanics of hearing at low sound pressure levels from measurements of basilar membrane motion. The mechanical properties of individual sections of the cochlea have been determined by examining their collective response to tones of different frequency. The conclusion is that each section acts like a harmonic oscillator with negative damping. The oscillator is controlled by negative feedback that drives the oscillator with a force proportional to the displacement of the oscillator at an earlier time. The time delay is approximately 1.75 times the oscillator's period. Thus, the inner ear is "active," creating sound that interferes "intelligently" with the incoming sound.
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