Visualization of object through acoustic waves is generally called as acoustical imaging. This concept contain noise source localization, ultrasonic non-destructive testing, medical ultrasound, underwater sonars, etc. In these conventional imaging techniques, frequency information has not yet utilized effectively, though shape, material and even structure behind the surface reflect on the frequ...

IT is an anachronism that the stethoscope, introduced in 1819, remains an indispensable medical tool today although no standards have ever been set for its acoustical performance.' Neither has a standard test been established for evaluating the acoustics of the intact instrument. Furthermore, there is no information on the intimate acoustical interaction of the stethoscope with the doctors' ear...

T HERE are no reliable acoustical data to aid physicians in their selection or use of a stethoscope. Yet, the sole medical utility of any stethoscope is derived from its acoustical performance. It is the purpose of this paper to provide clinicians with objective acoustical performance data on intact and current stethoscopes. Frederick and Dodge' first recognized that the stethoscope was deservi...

Physical modeling is a modern approach to musical acoustics and high-quality sound synthesis of musical instruments. In this paper, a time-domain method is used to measure acoustical properties of wind instruments. The instrument bore is modeled by an acoustical tube and a DSP-based measurement system is used to characterize transmission and reflection functions in the duct. Inverse filtering t...

Active room compensation based on wave field synthesis (WFS) has been recently introduced. So far, the verification of the compensation algorithms is only possible through elaborate acoustical measurements. Therefore, a new simulation method is applied that is based on the functional transformation method (FTM). Compared with other simulation techniques, the FTM provides several advantages that...

How to effectively collect diverse data of spontaneous speech and to upgrade various speech processing techniques is a serious issue. In this paper, we introduce our proposed method “SEN method”, which aims to collect psychologically and acoustically diverse acted speech effectively with naturalness. We created detailed directions, on the basis of various real-life scenarios, consulting with a ...

In this paper a study of the acoustical response of a new built church is shown. This study is based on the measurement of reverberation time, adopting the noise interrupted method, according to the International Standard. This method allows to evaluate the reverberation time by means of acoustical sound level acquisition and analysis. The reverberation time is one of the principal parameters t...