The use of RTSect is straightforward. Start-up it
using the key:
The upper pane shows the waveform (like an
oscilloscope). The lower pane shows the spectrum (like a spectrum
Here the formants were all switched off, so that you can
see the waveform as a typical sawtooth, with some amount of Gibbs
phenomenon (ringing) due to the circumstance that the number of
partials is limited (finite). The exponential overall shape of the ll
peaks is due to the -6 db/octave slope. If also the frequency scale
were logarithmic (i.e., notes or pitch, rather that frequencies in
Hertz), the shape would be rectilinear.
Note: LTAS = Long Term Average Spectrum (or LTS,
Long Term Spectrum), namely the spectrum taken over a long period (
> 30 sec). It should typically show the average quality of the
Try the LTAS blue key, you can see a average spectrum
accumulating. The red key reset the spectrum.