Abstract
There are a variety of applications in which it is desired to modify a speech signal in such a way that its speed is changed while its intelligibility and natural quality is retained. An appropriate mathematical representation for the speech waveform is formulated such that time scaling the parameters of the representation corresponds to effecting the desired time-scale modification. A high-quality analysis/synthesis system based on this representation was designed and simulated. This system employs short-time Fourier analysis techniques to implement the desired modification of the speech signal and is capable of producing high-quality speed-transformed speech with large compression and expansion factors. Issues such as non-integer scale factors, phase unwrapping, and feature-dependent (nonuniform) modifications will be considered.
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