Single-microphone wind noise suppression

摘要

A technique for suppressing non-stationary noise, such as wind noise, in an audio signal is described. In accordance with the technique, a series of frames of the audio signal is analyzed to detect whether the audio signal comprises non-stationary noise. If it is detected that the audio signal comprises non-stationary noise, a number of steps are performed. In accordance with these steps, a determination is made as to whether a frame of the audio signal comprises non-stationary noise or speech and non-stationary noise. If it is determined that the frame comprises non-stationary noise, a first filter is applied to the frame and if it is determined that the frame comprises speech and non-stationary noise, a second filter is applied to the frame.

主权项

1. A method for suppressing non-stationary noise in an audio signal, comprising:
determining whether each frame in a series of frames of the audio signal is a non-stationary noise frame, wherein determining whether a frame is a non-stationary noise frame comprises:
analyzing results associated with a linear predictive coding (LPC) analysis of the audio signal including at least determining a resulting error from evaluating an order-M LPC polynomial at roots of an order-N LPC polynomial where M≠N, and basing the determination of whether the frame is a non-stationary noise frame at least on the analysis of the results; applying non-stationary noise suppression to each frame in the series of frames that is determined to be a non-stationary noise frame; and storing the series of frames in a storage or playing back the series of frames using an audio output device.