SPORCH (SPectral ORCHestrater) is a Lisp based computer program that provides orchestrations for any ensemble of acoustic instruments based on any arbitrary sound file input. The result, when played, approximates the sound source in timbre and sound quality. The amount of approximation depends on the nature of the source material, the instruments specified, and other controlling parameters. SPO...

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...

Drosophila melanogaster have bilateral antisymmetric antennae that receive the particle velocity component of an acoustic stimulus. Acoustic communication is important in their courtship, which takes place in the acoustic near-field. Here, the small size of the dipole sound source (the male wing) and the rapid attenuation rate of particle velocity produce a spatially divergent sound field with ...

Using inelastic x-ray scattering we studied the collective dynamics of the glassy alloy Ni33Zr67 in the first pseudo-Brillouin-zone, an energy-momentum region still unexplored in metallic glasses. We determine key properties such as the momentum transfer dependence of the sound velocity and of the acoustic damping, discussing the results in the general context of recently proposed pictures for ...

Abstract Open-vent volcanoes provide opportunities to perform various methods of observation that can be used study shallow plumbing systems. The depth the magma–air interface in portion conduit as an indicator volcanic activity open-vent volcanoes. Although there are many estimate depth, most them cannot constrain a narrow range due other unknown parameters. To more accurately, we combine two ...

Acoustic building modeling in computer programs is very useful in the understanding of room acoustics for venues of various types by architecture and architectural engineering students. Models provide calculation of reverberation time using the Sabine and similar equations as interior materials are changed. Ray tracing can be used to understand the effect of disturbing sound reflections from in...

This paper presents measurements and model predictions of the density and size distribution of bubbles in the wakes of full scale ships, and the effects of the bubbles on acoustic propagation. The ship wake is primarily a hydrodynamic process, characterized by temporally and spatially varying flow conditions (i.e., local fluid velocity, pressure, turbulent kinetic energy and dissipation, etc.) ...

Acoustic field calculations in underwater environments are often uncertain because the environmental parameters required for such calculations are uncertain. This letter compares the accuracy of direct simulations, the field shifting approximation, and polynomial chaos expansions for predicting acoustic amplitude uncertainty in 100-m-deep Pekeris waveguides having spatially uniform uncertain wa...

A difficult problem in specifying the characteristics of electroacoustic transducers is the fact that the sound pressure level measured in a standard coupler or artificial ear is not the same as that at the eardrum. A related problem is encountered in specifying the overall gain of a hearing aid. This latter problem is especially difficult because of the complexity of the acoustic coupling betw...