Patent ID: 7792314
Filing Date: 2010-09-07
Classification: G10L,H04B

Abstract:
1. A method for enhancing a noisy acoustic signal, comprising: acquiring an acoustic signal from an acoustic source; generating an ultra-sonic signal; acquiring concurrently an ultra-sonic Doppler signal corresponding to the ultra-sonic signal reflected from moving parts of the acoustic source; and analyzing jointly the acoustic signal and the ultra-sonic Doppler signal according to a model to generate an enhanced acoustic signal, wherein the model is a mixture of distributions, and the model includes a plurality of states, each state modeling one acoustic spectrum and one corresponding Doppler spectrum, and the model includes a priori probabilities of the states, state dependent distributions of the Doppler spectra, and state dependent distributions of the acoustic spectra, and wherein the acoustic spectra and Doppler spectra are combined using a posteriori probabilities of the states of the model as weights to generate the enhanced acoustic signal.