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Using spectogram to speed up a signal - Time Scaling/Phase Vocoder

The description seems to match that of a phase vocoder, which isn't a simple algorithm but there's a detailed explanation here. Some points: "Toss every 2nd column then invert" isn't it. ...
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Using spectogram to speed up a signal - Time Scaling/Phase Vocoder

Speeding up or slowing down sounds is called time-scale-modification, and it is not as simple as throwing away segments. You start with the spectrogram but use different analysis and synthesis ...
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Using spectogram to speed up a signal - Time Scaling/Phase Vocoder

If you delete a segment of a non zero amplitude sine wave, and that deleted segment isn’t a multiple of a wavelength or period in length, then when you abutt the remaining portions of the sine wave ...
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