Patent ID: 7502484
Filing Date: 2009-03-10
Classification: G10L,H04R

Abstract:
1. A sound processing apparatus, comprising: a microphone positionable with respect to an ear canal to detect sound signals from the ear canal and to generate a corresponding output signal, wherein the output signal from the microphone corresponds to a portion of speech and has a different spectral response than a spectral response of the same speech from the mouth of a user; and a circuit that normalizes the output signal from the microphone by applying a normalization function to the output signal from the microphone, the normalized signal having a spectral response that is closer to the spectral response of the speech from the mouth of the user than the spectral response of the output signal from the microphone; wherein the normalization function is an inverse of a transfer function that is based on a ratio of a spectral response of a speech sample detected from the mouth of a sampled individual to a spectral response of the speech sample detected from the ear of the sampled individual.