Overlap-add methods for time-scaling of speech ?
In this tutorial on time-scaling we follow one particular line of thought towards computationally efficient high quality methods. We favor time-scaling based on timefrequency representations over model based approaches, and proceed to review an iterative phase reconstruction method for time-scaled magnitude spectrograms. The search for a good initial phase estimate leads us to consider synchronized overlap-add methods which are further optimized to eventually arrive at WSOLA, a technique based on a waveform similarity criterion.
overlap-add time-scaling wsola speech processing speech modification time-warping short-time fourier transform