Waveform recognition of the modes
Looking at the images of the waveform we can confirm that it seems possible to identify the modes by the Laryngograph waveforms to a certain extend. There are some extend patterns in the waveform that could be used to identify the modes. (See Waveform recognizion in Neutral, Curbing, Overdrive and Edge)
You can see the green trace is the Laryngograph changes, where you can see the very distinctive wave patterns for the different type of modes.
Waveform in sound colour
A study was recording the laryngograph ELG signal with the acoustic signal using the speech studio program for the analysis.
This is the type of output you get with the speech studio program. You can see the spectrogram with Overdrive and see that the spectrum changes when you are changing the sound colour.
The green line is the fx trace and you can see that it is fairly level, and so is the contact quotient (Qx) (the purple line).
The little frame in the middle picture the magnified view, with 2 lines. The top one is a blue line that is the speech signal, the one underneath is the laryngograph line, the electroglottal measure, that gives us a measure of the vocal folds activity. Here you see a nice and regular waveform when the mode is sustained.
On the sustained notes you can’t see much activity, just a waveform that indicates which mode is being used, and then when the change of sound colour comes on you’ll see very little variation indicating that the vocal folds is vibrating fairly regular underneath the change of sound colour. There is only a little bit of pertubation in both amplitude and frequency. Often only the baseline of the waveform gets unstable and it shows peek variation and variantions in the size and the width of the waveform, but the shape of the waveform remains the same. This shows that it is still the same mode that is sung and the vocal folds vibration is remaining unhindered during change of sound colour.
Contrary to an uncontrolled constriction where everything seem to constrict and you see irregular laryngograph waveform, here you see the laryngograph waveform looks the same regardless of the change of sound colour. By displaying the same waveform from mode to mode with change of sound colour we asume that the vocal folds underneath are vibrating regularly.
This study has not yet been presented