1. A method for processing an input window of an audio signal, the input window having a plurality of frames, the method comprising: extracting auditory attention features from each of the frames of the input window; extracting phone posteriors from each of the frames of the input window; generating combined boundary posteriors from a combination of the auditory attention features and the phone posteriors using machine learning; and estimating boundaries in speech contained in the audio signal from the combined boundary posteriors.