Glottal stop insertion at word boundaries is usually not included in descriptions of the phonology of Southern Standard British English (BrE), and little is known about the factors that determine it. This paper investigates the insertion of glottal stops before vowels at word boundaries (e.g. pronounced as [taUnPIz]) in the spontaneous and read speech of 10 speakers of BrE. Results sh...

This paper presents a robust feature extraction method effective to speech signal with high fundamental frequency and/or corrupted by additive white noise. The method represents the glottal source wave using HMM in order to model the nonstationary properties. The nodes of HMM are concatenated in a ring state to represent the periodicity of voiced sounds. The method can accurately extract glotta...

This paper examines the use of glottal stops in English as a second language and Polish by Polish native speakers and in English by native speakers. The study compares glottal stop frequency in utterance-initial accented and unaccented positions. The major finding is that Polish native speakers use more glottal stops in English in unaccented than in accented syllables. This tendency is compared...

This article examines the oral and glottal adjustments, as well as their coordination, during the production of singleton and geminate voiceless stops in Berber using fiberscopy, photoglottography and acoustic analyses. Acoustically, closure duration of geminates is longer than singletons. VOT, on the other hand, does not contribute to the distinction of length. At the glottal level, voiceless ...

We have already developed a speech analysis method based on the Glottal-ARMAX (Auto Regressive and Moving Average eXogenous) model, in which the speech production model is supposed to be an ARMAX vocal tract model and two kinds of excitation: glottal source model excitation and white Gaussian. The speech analysis method based on the Glottal-ARMAX model can estimate the glottal source and ARMAX ...

The great majority of current voice technology applications rely on acoustic features, such as the widely used MFCC or LP parameters, which characterize the vocal tract response. Nonetheless, the major source of excitation, namely the glottal flow, is expected to convey useful complementary information. The glottal flow is the airflow passing through the vocal folds at the glottis. Unfortunatel...

Information on the glottal waveform is an important part of many speech applications. However, glottal waveform estimation remains one of the more inexact sciences of speech processing. The work presented here describes an enhancement to a recently presented algorithm by a new technique involving Rank-Based Glottal Quality Assessment (RB-GQA). The basic premise is to investigate potential measu...

Glottal inverse filtering is of potential use in a wide range of speech processing applications. As the process of voice production is, to a first order approximation, a source-filter process, then obtaining source and filter components provides for a flexible representation of the speech signal for use in processing applications. In certain applications the desire for accurate inverse filterin...

Speech coders invariably spend about 1/3 of their bits replicating a number of effects collectively termed "excitation". The need for so much bandwidth stems from two causes. The frame rate must be relatively high, because transient changes must be resolved. The data needed for each frame is high because unpredictable broad-band components must be reproduced. Here we discuss three projects to l...