Systems and methods for suppressing noise in an audio signal for subbands in a frequency domain based on a closed-form solution

摘要

Systems and methods for reducing noise from an input signal are provided. An input signal is received. The input signal is transformed from a time domain to a plurality of subbands in a frequency domain, where each subband of the plurality of subbands includes a speech component and a noise component. For each of the subbands, an amplitude of the speech component is estimated based on an amplitude of the subband and an estimate of at least one signal-to-noise ratio (SNR) of the subband. The estimating of the amplitude of the speech component is based on a closed-form solution. The plurality of subbands in the frequency domain are filtered based on the amplitudes of the speech components.

主权项

1. A method for reducing noise from an input signal to generate a noise-reduced output signal, the method comprising:
receiving an input signal; transforming the input signal from a time domain to a plurality of subbands in a frequency domain, wherein each subband of the plurality of subbands includes a speech component and a noise component; for each of the subbands, estimating an amplitude of the speech component based on a of minimization of a normalized mean square error, wherein the normalized mean squared error is based on a mean squared error represented by E[(A−Â)|Y], where  is an estimate of the amplitude of the speech component, A represents an actual value of the amplitude of the speech component, Y is the amplitude of the subband, and E is an expected value operator; and filtering the plurality of subbands in the frequency domain based on the estimated amplitudes of the speech components to generate the noise-reduced output signal.