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Time-domain time-scaling algorithms are efficient in comparison to their frequency-domain counterparts, but they rely upon the existence of a quasi-periodic signal to produce a high quality output. This requirement makes them unsuitable for use on multi-pitched signals such as polyphonic music. However, time-domain techniques applied on a subband basis can resolve the multi-pitch problem. The authors propose an improved subband implementation based upon the bark scale for the time scale modification of music. The new subband approach is supported by psychoacoustic and music theory and subjectively through informal listening tests.
Dorran, D., Lawlor, R.: Time scale modification of music using a subband approach based on the Bark scale. IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, pp. 173-175, New Paltz, New York, United States of American, 2003.