Technical Note
Version 1
Preserved in Portico This version is not peer-reviewed
Pragmatic De-noising of Electroglottographic Signals
Version 1
: Received: 26 March 2024 / Approved: 27 March 2024 / Online: 27 March 2024 (06:38:31 CET)
How to cite: Ternström, S. Pragmatic De-noising of Electroglottographic Signals. Preprints 2024, 2024031637. https://doi.org/10.20944/preprints202403.1637.v1 Ternström, S. Pragmatic De-noising of Electroglottographic Signals. Preprints 2024, 2024031637. https://doi.org/10.20944/preprints202403.1637.v1
Abstract
In voice analysis, the electroglottographic (EGG) signal has long been recognized as a useful complement to the acoustic signal, if only when the vocal folds are actually contacting, such that this signal has an appreciable amplitude. However, phonation can occur also without vocal fold contacting, as in breathy voice, in which case the EGG amplitude is low, but not zero. It is of great interest to identify the transition from non-contacting to contacting, because this will substantially change the nature of the vocal fold oscillations; yet that transition is not in itself audible. The magnitude of the normalized peak derivative of the EGG signal is a convenient indicator of contacting, but no current EGG hardware has a sufficient signal-to-noise ratio of the derivative. The textbook techniques of spectral thresholding and static notch filtering are straightforward to implement, can run in real time, and can mitigate several noise problems in EGG hardware.
Keywords
electroglottography; de-noising; contact quotient; peak dEGG; spectral thresholding; notch filtering
Subject
Medicine and Pharmacology, Otolaryngology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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