links stroboscopic analysis and the triggering speech
or Laryngograph® waveforms. These signals can themselves
provide the basis for a non-invasive monitoring
of several minutes of continuous speech which would
be impossible while using a rigid endoscope. When
such analysis is linked to the stroboscopic findings
a more complete picture can be obtained.
The image above right is the seventh in a sequence
of eight images representing one vocal fold contact
The associated Speech and Laryngograph® waveforms
confirm that the image was taken in the middle of
the open phase and that the frequency of vibration
was 310Hz. This is a relatively high frequency for
The detailed analyses based on the two-minute speech
sample show how this speaker coped with the effects
of the vocal fold scarring shown in the single stroboscopic
The first order distribution of fundamental frequency
(DFx1) shows three peaks with the main one being
at the abnormally high fundamental frequency at
which the stroboscopic image was taken.
The cross plot of vocal fold contact quotient v
fundamental frequency (QxFx2) shows that this main
mode is achieved with the use of a high closed quotient
which is, again, unusual in the higher frequency
range for women. In auditory terms the distributions
give the impression of a very hoarse, irregular
voice with an unnaturally high-pitched component.
vocal fold scarring
In the figure above, the image shows a single shot
in the middle of the open phase, from a stroboscopic
sequence using LxStrobe to cover the interval of
one period. The acoustic, Laryngograph® and strobe
trigger (centre) signals are beneath.