This study examines modifications to the acoustic and affective qualities of infant-direct speech (IDS) from birth to 12 months. The acoustic analysis of fundamental frequency shows that IDS has the highest level of mean fundamental frequency (F0) in speech to infants at 6 months, and the highest level of pitch range in speech to infants at 12 months. Sex-based differences were evident with mot...

Both for robust fundamental frequency (F0) measurement and to provide a degree of voicing indication, a new algorithm has been developed based on multi-channel autocorrelation analysis. The speech is filtered into eight separate frequency bands, representing the lowest 500 Hz and seven overlapping band-pass channels each about 1000 Hz wide. The outputs of all the band-pass channels are full-wav...

Robust speech recognition system is necessary in real environment, whereas tone in Thai speech recognition system is an importance as well. Therefore, we attempt to find tone model for enhancing Thai speech recognition system in noisy environment. In this paper we present an empirical study by configuration fundamental frequency contour, which one of prosodic information for tone language. Fund...

To investigate the acoustic characteristics of spoken language development, the utterances of five Japanese infants and their parents were recorded from the infants’ birth until the age of 60 months. An infant-speech database is now being developed from these longitudinal recordings. New methods of fundamental frequency (F0) extraction and voiced/unvoiced segment detection were proposed in orde...

Background & Aims: Previous studies have indicated significant differences in vocal parameters between children with Down syndrome and normal children, but there are challenges about these differences. In this study vocal parameters and Maximum Phonation Time (MPT) in adults with Down syndrome have been investigated. Method: This cross-sectional and analytic study was performed on 22 adults wit...

In this article, propagation delay matched CMOS frequency doubler for L-band application is proposed. Schmitt trigger and voltage controlled delay line compensates duty cycle error and propagation delay mismatching that are induced as the frequency of operation is increased. As a consequence, unwanted harmonic components suppression is greatly improved for higher frequency of operation. CMOS fr...

A new algorithm for the determination of fundamental frequency (F0) contours is presented. For each voiced frame appropriate divisors of the frequency with the maximum energy in the spectrum are taken as F0 candidates. An F0 contour is computed using a dynamic programming (DP) method by minimizing a weighted sum of the diierence between consecutive candidates and the distance of the candidates ...

Longitudinal changes were investigated for selected voice source parameters: fundamental frequency (F0), jitter (period perturbation quotient, PPQ), shimmer (amplitude perturbation quotient, APQ) and glottal noise (normalized noise energy, NNE). Acoustic analyses were made on the sustained phonation of the Japanese vowel /a/ of 20 males and 38 females with no laryngeal disease, which were recor...

Vocal melody extraction is an important and challenging task in music information retrieval. One main difficulty that, most of the time, various instruments singing voices are mixed according to harmonic structure, making it hard identify fundamental frequency (F0) a voice. Therefore, reducing interference accompaniment beneficial pitch estimation In this paper, we first adopted high-resolution...

We consider a two-dimensional demodulation framework for spectro-temporal analysis of the speech signal. We construct narrowband (NB) speech spectrograms, and demodulate them using the Riesz transform, which is a two-dimensional extension of the Hilbert transform. The demodulation results in timefrequency envelope (amplitude modulation or AM) and timefrequency carrier (frequency modulation or F...