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To illustrate some fundamental points, let's look at some TSM
waveforms for a test signal consisting of two constant-amplitude
sinusoids near 400 Hz having frequencies separated by 10 Hz (to create
an amplitude envelope having 10 beats/sec). We will perform a
time expansion (
``slow-down'') using the following
three algorithms:
- phase-continued vocoder [#!Ellis02-pvoc!#]
- relative-phase-preserved vocoder [#!Salsman11!#,#!Robel03!#,#!LarocheAndDolson99!#,#!Puckette95!#]
- SOLA-FS
[#!Ellis02-pvoc!#,#!HejnaAndMusicus91!#]11.13
The vocoder STFT frame size is set to 45 ms, the analysis hop size is
1/4 frame, or 11.25 ms, so the analysis frame rate is 89 Hz.
The results are shown in Figures 10.18 through 10.23.
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