The transmission coefficient of a layered structure made of glass and water was calculated using transfer matrix method and also measured as a function of frequency. It was found that acoustic band gaps can be created using only 3–4 cells of a two-phase layered structure. By introducing two or more periods into the layered structure, very sharp passbands and very broad stopbands can be engineer...

Abstract Noise has become one of the most critical problems to address in contemporary cities, and awareness consequences noise pollution been increasing lately. Road traffic exposure is considered a serious environmental health hazard, as excessive increases cardiovascular diseases anxiety. People spend their time residences where they tolerant noisy environments are unaware effects caused by ...

In medical ultrasound transducers, the transmission mode (pass-through) approach has been used to estimate the characteristics of the acoustic lens. However, it is difficult to measure the acoustic lens properties with high precision because of human, systemic, or mechanical measurement errors. In this paper, we propose a low-cost estimation instrument for acoustic lens properties connected wit...

Abstract One of the most challenging techniques for speech analysis applications in mobile phones is acoustic feature extraction. The adverse environment noises, diversity microphone specifications, and various recording software have a significant effect on values extracted features. In this study, we investigate robustness different types features related to time-based, frequency-based, susta...

In this paper the results of an experimental investigation on the acoustic parameters employed in the implementation of a subset of the phonological consonants in the Tikúna language are presented. Special emphasis is placed on the discussion and presentation of variations that can be accounted for by reference to main stress placement in the language. It is shown how consonant duration, VOT an...

An acoustic material made of exploded bamboo fibers has been newly developed from an ecological viewpoint. The basic acoustical properties of the material as the sound absorption coefficient, the characteristic impedance, and the propagation constant were measured for the frequency range between 50 and 6400 Hz by the transfer function method using two-microphone impedance tubes. In order to des...

Evaluation of singing skill is a popular function of karaoke machines. Here, we introduce a different aspect of evaluating the singing voice of an amateur singer: “enthusiasm”. First, we investigated whether human listeners can evaluate enthusiasm consistently and whether the listener’s perception matches the singer’s enthusiasm. We then identified three acoustic features relevant to the percep...

acoustic experimental data of irib (islamic republic of iran broadcasting) server room was taken to measure the acoustic noise characteristics of frequency and sound pressure level (spl). the purposes of this paper are measuring the noise pollution and its evaluation through the regulations. the measurements were taken in two stages. the first one was taken at 10 points by sound investigator 22...

OBJECTIVES Acoustic rhinometry is a rapid, reliable and non-invasive technique for the evaluation of conditions associated with impaired nasal patency. This study aimed to examine the intersession repeatability of acoustic rhinometry measurements of unilateral and combined nasal parameters in a group of healthy volunteers. METHODS Twenty healthy volunteers were studied. In each subject, acous...