This research has been carried out to determine the marine propeller hydro-acoustic characteristics by Reynolds-Averaged Navier-Stokes (RANS) solver in both uniform and non-uniform wake flow at different operating conditions Wake flow can cause changes in pressure fluctuation and gas effect on propeller noise spectrum. Noise is generated by the induced trailing vortex wake and induced pressure ...

Auditory scene analysis (ASA) refers to the ability of the auditory system to organize perceptually a sound mixture into distinct auditory streams, each stream ideally corresponding to a single sound source (see Bregman 1990 for a review). Level cues can be used to promote perceptual segregation of auditory objects. As such, temporal sequences of pure tone bursts with the same frequencies but w...

This paper reviews the available evidence (published and unpublished) on the relation between loudness and stimulus intensity. The e. vidence suggests that for the typical listener the loudness L of a 1000-cycle tone can be approximated by a power function of intensity I, of which the exponent is log•02. The equation is: L--kI ø.a. Intensity here is assumed to be proportional to the square of t...

The use of conventional metrics to quantify the perception of nonlinearly propagated noise has been studied. Gaussian noise waveforms have been numerically propagated both linearly and nonlinearly, and from the resulting waveforms, several metrics are calculated. These metrics are overall, A-, C-, and D-weighted sound pressure levels, perceived noise level, Stevens Mark VII perceived loudness, ...

This paper reviews the effects of one sound on the loudness of a following sound. The following sound is usually perceived as softer than when presented in isolation. At least five sequential effects can be identified. (1) Simple loudness adaptation: the earlier part of an ongoing sound results in a decline in the loudness of later parts. (2) Ipsilaterally induced adaptation: increments in the ...

We examine the effect of listening level, i.e. the absolute sound pressure level at which sounds are reproduced, on music similarity, and in particular, on playlist generation. Current methods commonly use similarity metrics based on Mel-frequency cepstral coefficients (MFCCs), which are derived from the objective frequency spectrum of a sound. We follow this approach, but use the level-depende...

Sound sources used for broadcasting on the air are usually produced and delivered in different levels of sound volume, thus inevitably creating the loudness/imbalance problem among various sound sources. This study examines the loudness of TV news anchorwomen’s voice and the sound of commercial advertisements on the Internet using Absolute Sound Level, to evaluate the current status and identif...