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The synchonised overlap-add (SOLA) algorithm is a commercially popular and considerably researched audio time-scale modification technique. It operates in the time domain and uses a correlation technique to ensure that synthesis frames overlap in a synchronous manner. We present a modification to SOLA that allows the analysis step size adapt to the desired time-scale factor. The synchronised and adaptive overlap-add (SAOLA) alogorithm improves upon the output quality of SOLA for high time-scale factors and reduces the computational requirements for low time-scale factors. However, the computational requirements for high time-scale factors are increased.
Dorran, D., Lawlor, R. & Coyle, E. (2003) Time-scale modification of speech using a synchronised and adaptive overlap-add (SAOLA) algorithm. 114th. Audio Engineering Society Convention, paper#5834, Amsterdam, the Netherlands, 2003.