7 research outputs found
Effect of the glottal source and the vocal tract on the partials amplitude of vibrato in male voices
In this paper the production of vocal vibrato is investigated. The most relevant features of the
acoustical vibrato signal, frequency and amplitude variations of the partials, will be related to the
voice production features, glottal source GS and vocal tract response VTR . Unlike previous
related works, in this approach, the effect on the amplitude variations of the partials of each one of
the above-mentioned voice production features will be identified in recordings of natural singing
voice. Moreover, we will take special care of the reliability of the measurements, and, to this aim,
a noninteractive vibrato production model will be also proposed in order to describe the vibrato
production process and, more importantly, validate the measurements carried out in natural vibrato.
Based on this study, it will be shown that during a few vibrato cycles, the glottal pulse
characteristics, as well as the VTR, do not significantly change, and only the fundamental frequency
of the GS varies. As a result, the pitch variations can be attributed to the GS, and these variations,
along with the vocal tract filtering effect, will result in frequency and amplitude variations of the
acoustic signal partials.This work was supported in part by the Ministerio de
Educación y Ciencia under Grant FPU, AP2000-4674. The
Gobierno de Navarra and the Universidad Pública de Navarra
are gratefully acknowledged for financial support
Vibrato in singing voice: the link between source-filter and sinusoidal models
The application of inverse filtering techniques for high-quality singing voice analysis/synthesis is discussed. In the context of source-filter models, inverse filtering provides a noninvasive method to extract the voice source, and thus to study voice quality. Although this approach is widely used in speech synthesis, this is not the case in singing voice. Several studies have proved that inverse filtering techniques fail in the case of singing voice, the reasons being unclear. In order to shed light on this problem, we will consider here an additional feature of singing voice, not present in speech: the vibrato. Vibrato has been traditionally studied by sinusoidal modeling. As an alternative, we will introduce here a novel noninteractive source filter model that incorporates the mechanisms of vibrato generation. This model will also allow the comparison of the results produced by inverse filtering techniques and by sinusoidal modeling, as they apply to singing voice and not to speech. In this way, the limitations of these conventional techniques, described in previous literature, will be explained. Both synthetic signals and singer recordings are used to validate and compare the techniques presented in the paper
Modelling of vibrato production
Trabajo presentado a la XII European Signal Processing Conference (EUSIPCO), Viena (Austria), 2004In this paper, a novel Non-Interactive Source-Filter model
for singing voice, incorporating vibrato, is proposed. In this
way the periodic frequency variation, peculiar to vibrato is
included in a simplified signal model for singing voice production.
The inclusion of vibrato will further allow to relate
two distinct signal models for the voice: The Non Interactive
Source-Filter and the Sinusoidal Models. In this way, the
Instantaneous Amplitude and Instantaneous Frequency of
the harmonics, which are intrinsically Sinusoidal Model
parameters, will be related to the glottal source and vocal
tract response, typical of the Source-Filter model.
Thanks to the proposed model, the most relevant acoustic
features of vibrato will be related to the voice production
mechanisms.The Gobierno de Navarra and the Universidad Pública de
Navarra are gratefully acknowledged for financial support