Very good results and embarrassingly easy to implement!
The very stretched waveform did contain some audible artifacts, but I think other methods like FFT would introduce some as well.
This kind of trick works because our hearing is frequency-based. So the crucial thing is to preserve the frequencies and it is going to sound exactly the same.
Trying this with an image for example wouldn't work, because our vision is sample-based. Imagine splitting an image in tiny fragments and repeating/interpolating them on top of one another.
The very stretched waveform did contain some audible artifacts, but I think other methods like FFT would introduce some as well.
This kind of trick works because our hearing is frequency-based. So the crucial thing is to preserve the frequencies and it is going to sound exactly the same.
Spatial mapping of frequencies in the human ear here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2394499/ (see fig 5.)
Trying this with an image for example wouldn't work, because our vision is sample-based. Imagine splitting an image in tiny fragments and repeating/interpolating them on top of one another.