An efficient finite volume approach has been used to develop a three dimensional Helmholtz acoustic solver for complex geometries. This acoustic solver was utilized to obtain characteristic mode shapes and frequencies of a baffled combustion chamber. An experimental setup, including stationary and moving sensors, has also been used to measure these quantities for the same model combustion chamb...

Speech duration is an important component in statistical parameter speech synthesis(SPSS). In LSTM-RNN based SPSS system, the speech duration affects the quality of synthesized speech in two aspects, the prosody of speech and the position features in acoustic model. This paper investigated the effects of duration in LSTM-RNN based SPSS system. The performance of the acoustic models with positio...

Nowadays, in the field of communications, AEC (acoustic echo cancellation) is truly essential with respect to the quality of multimedia transmission. In this paper, we designed and developed an efficient AEC based on adaptive filters to improve quality of service in telecommunications against the phenomena of acoustic echo, which is indeed a problem in hands-free communications. The main advant...

Researchers as well as speech therapists are interested in the determination of reliable acoustic cues that may be useful for the evaluation of vocal quality as well as for the diagnosis of vocal pathologies and remediation. In this way, experimental phonetics can be useful to clinical practice. This work which tries to connect phonetics and logopedic science, deals with the esthetic quality of...

Phonetic segmentation is the basis for many phonetic and linguistic studies. As manual segmentation is a lengthy and tedious task, automatic procedures have been developed over the years. They rely on acoustic Hidden Markov Models. Many studies have been conducted, and refinements developed for corpus based speech synthesis, where the technology is mainly used in a speaker-dependent context and...

This article presents an experimental comparison of two types of techniques, articulatory and acoustic, for transforming nonnative speech to sound more native-like. Articulatory techniques use articulators from a native speaker to drive an articulatory synthesizer of the non-native speaker. These methods have a good theoretical justification, but articulatory measurements (e.g., via electromagn...

The present study shows the relationship between welding quality and optical-acoustic emissions from electric arcs, during welding runs, in the GMAW-S process. Bead on plate welding tests was carried out with pre-set parameters chosen from manufacturing standards. During the welding runs interferences were induced on the welding path using paint, grease or gas faults. In each welding run arc vo...

This paper derived four acoustic parameters reflecting voice quality improvement by voice training. Voice training corrects respiration, phonation, articulation, and facial expression. The purpose of this study is to develop acoustic parameters which quantitatively represent the quality of each training item. This paper examined six acoustical feature parameters on the performance as the measur...

This paper reports our investigation of the acoustic effects of vocal training for amateur singers and of the contribution of those effects to perceived vocal quality. Recording singing voices before and after vocal training and then analyzing changes in acoustic parameters with a focus on features unique to singing voices, we found that two different F0 fluctuations (vibrato and overshoot) and...