Time-Scale Modification of Speech using a Synchronised and Adaptive Overlap-Add (SAOLA) Algorithm
David Dorran, Robert Lawlor, Eugene D. Coyle · Arrow - TU Dublin (Technological University Dublin) · 2003
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.