ESTIMATION OF BACKGROUND NOISE IN AUDIO SIGNALS

摘要

The present invention relates to a background noise estimator and method for estimating background noise of an audio signal. The method includes a first linear prediction gain calculated as the quotient between the residual signal from the zero-order linear prediction and the residual signal from the second-order linear prediction for the audio signal segment and the residual signal from the second-order linear prediction for the audio signal segment. and obtaining at least one parameter related to an audio signal segment, such as a frame or part of a frame, based on the second linear prediction gain calculated as a quotient between the remaining signals from the 16th-order linear prediction. The method includes determining whether the audio signal segment includes a pause based at least on the obtained at least one parameter; and updating the background noise estimate based on the audio signal segment when the audio signal segment includes a pause.