TSM Examples

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 $2\times$ time expansion ($2\times$ ``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.