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Improved Time-Scaling of Musical Audio Using Phase Locking at Transients

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We present a method using temporal information of musical audio to considerably improve time-scaling with pitch-preservation. This work builds on a signal model where the original signal is split into transient and steady state components, based on an adaptive multiresolution analysis. By considering only the transient signal content, temporal segmentation is achieved with a much higher degree of accuracy than standard onset detection algorithms. Only the segmented steady state regions are then stretched, whilst phase is locked in the temporally masked regions at transients. Despite local variances in stretching factor, rhythm is maintained globally, yielding perceptually very high quality results for a range of complex polyphonic musical signals, at a low computational cost.

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AES - Audio Engineering Society