Download An Efficient Phasiness Reduction Technique for Moderate Audio Time-Scale Modification Phase vocoder approaches to time-scale modification of audio introduce a reverberant/phasy artifact into the time-scaled output due to a loss in phase coherence between short-time Fourier transform (STFT) bins. Recent improvements to the phase vocoder have reduced the presence of this artifact, however, it remains a problem. A method of time-scaling is presented that results in a further reduction in phasiness, for moderate time-scale factors, by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence between related STFT bins. Furthermore, the approach leads to a reduction in computational load within the range of time-scaling factors for which phasiness is reduced.
Download Time and pitch scale modification: A real-time framework and tutorial A framework is presented which is designed to address the issues related to the real-time implementation of time-scale and pitchscale modification algorithms. This framework can be used as the basis for the developments of applications which allow for a seamless real-time transition between continually varying timescale and pitch-scale parameters which arise as a result of manual or automatic intervention.