The influence of intensive acute hypoxia on the frequency-amplitude formant vocal O characteristics was investigated in this study. Examinees were exposed to the simulated altitudes of 5,500 m and 6,700 m in climabaro chamber and resolved Lotig's test in the conditions of normoxia, i.e. pronounced the three-digit numbers beginning from 900, but in reversed order. Frequency and intensity values ...

This study aimed to investigate perceptually and acoustically Lessac's Y-Buzz and sustained productions of Brazilian Portuguese habitual /i/ vowels pre- and posttraining and to verify the presence of formant tuning and its association with the perception of a more resonant voice. The subjects of this study were 54 acting students, 31 female and 23 male, with no voice problems, distributed in se...

In this paper, we propose a filterbank-based technique to extract more robust and discriminative features for the application of telephony speech recognition. First, we propose an extended Lerner grouping method to approximate the shape of the Mel filters in MFCC while reducing the cross-correlation between filterbank outputs. Then we used welch processing to reduce the variance of the spectral...

This paper presents a particle-filtering method for estimating formant frequencies of speech signals from spectrograms. First, frequency bands corresponding to the analyzed formants are extracted via a two-step dynamic programming based algorithm. A particle-filtering method is then used to accurately locate formants in every formant areas based on the posterior pdf described by a set of suppor...

The measurement of formant frequencies of vowels is among the most common measurements in speech studies, but measurements are known to be biased by the particular fundamental frequency (F0) exciting the formants. Approaches to reducing the errors were assessed in two experiments. In the first, synthetic vowels were constructed with five different first formant (F1) values and nine different F0...

In this paper, we investigated the parameters for determining the degree of pronunciation improvement by using the formant comparison method. Many speech parameters have been studied to identify inaccurate pronunciation features. Generally, the method of grasping the inaccurate pronunciation is analyzed by using the change of pitch and formant. Formants have various information such as the indi...

Irino and Patterson (2002) have suggested the Mellin Transform as a model for vocal tract normalisation in the auditory system. In this report, we reanalyse the classical formant data reported by Peterson and Barney (1952) to see if it supports the normalisation hypothesis. The vowel formant data are clustered, quantitatively, using very general assumptions about speaker-variability. These clus...

High-pitched productions present difficulties in formant frequency analysis due to wide harmonic spacing and poorly defined formants. As a consequence, there is little reliable data regarding children's spoken or sung vowel formants. Twenty-nine 11-year-old Swedish children were asked to produce 4 sustained spoken and sung vowels. In order to circumvent the problem of wide harmonic spacing, F1 ...

PURPOSE This study reports data on vocal fundamental frequency (fo) and the first four formant frequencies (F1, F2, F3, F4) for four vowels produced by speakers in three adult age cohorts, in a test of the null hypothesis that there are no age-related changes in these variables. Participants were 43 men and 53 women between the ages of 20 and 92 years. RESULTS The most consistent age-related ...

Absfracf-A digital formant is a resonant network based on the dynamics of a second-order linear difference equation. A serial chain of digital formants can approximate the vocal tract during vowel production. In this paper, the digital formant is defined and i ts properties discussed, using z-transform notation. The results of detailed frequency response computations of both digital and convent...