Abstract
This paper presents a proposal to a source-filter theory of voice production, more precisely related to voiced sounds. It is a proposal of a model to generate signal using linear and time-invariant systems and takes into account the phonation biophysics and the cyclostationary characteristics of the voice signal, related to the vibrational behavior of the vocal cords. The model suggests that the oscillation frequency of the vocal cords is a function of its mass and length, but controlled by the longitudinal tension applied to them. The mathematical description of the model of glottal excitation is presented, along with a mathematical closed expression for the power spectral density of the signal that excites the glottis. The voice signal, whose parameters can be adjusted for detection and classification of glottis pathologies, is also present. As a result, the output of each block diagram that represents the proposed model is analysed, including a power spectral density comparison between emulated voice, original voice, and classic source-filter model. The Log Spectral Distortion is computed, providing values below 1.40 dB, indicating an acceptable distortion for all cases.
Highlights
IntroductionThe most accepted theory for the description of train of glottal pulses was proposed by Helmholtz and Muller, improved by van den Berg [1], in 1958, and Titze [2], in 1980, and is referred as Aerodynamic-Myoelastic Theory
The observation of the voice production mechanism begun in the eighteenth century, when it was stipulated that the vocal fold vibration was produced by air vibration.In 1950, Husson proposed that the vocal fold vibration is a consequence of individual nervous impulses, generated at a rate given by fundamental frequency, sent to vocal muscles, resulting in an air force exhaled through the vocal cords.Currently, the most accepted theory for the description of train of glottal pulses was proposed by Helmholtz and Muller, improved by van den Berg [1], in 1958, and Titze [2], in 1980, and is referred as Aerodynamic-Myoelastic Theory
The objective is the development of a theory that is more faithful to the biophysics of phonation, with the intent of enabling the detection and classification of pathologies in the vocal cords from its specific characteristics
Summary
The most accepted theory for the description of train of glottal pulses was proposed by Helmholtz and Muller, improved by van den Berg [1], in 1958, and Titze [2], in 1980, and is referred as Aerodynamic-Myoelastic Theory. According to this theory, the movement of opening and closing of the vocal folds is related to mechanical properties of the muscle that constitutes the vocal folds and to aerodynamic forces that are distributed along the larynx during the phonation. The differences in intonation is justified by variation of oscillation of the vocal folds
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