The general Kirchhoff theory of sound propagation in a circular tube is shown to take a considerably simpler form in a regime that includes both narrow and wide tubes. For tube radii greater than ro, = 10-3 cm and sound frequenciesf uch that r•f 3/2 < 106 cm s3/2, the Kirchhoff solution reduces to the approximate solution suggested by Zwikker and Kosten. In this regime, viscosity and thermal co...

We present a sound propagation and rendering system for generating realistic environmental acoustic effects in real time for game-like scenes. The system uses ray tracing to sample triangles that are visible to a listener at an arbitrary depth of reflection. Sound reflection and diffraction paths from each sound source to the listener are then validated using ray-based occlusion queries. Frame-...

In this paper, we will present a method for generating conversations between human-like agents and this will be done by proposing specific parameters for inter-agents messages with an approximation of virtual sound propagation. We will then be able to simulate appropriate human-like behaviours automatically. For instance, we will demonstrate how to create proper reactions for agents that are no...

Background and Challenges Modeling the acoustic properties of a virtual environment is an important step in simulating the acoustic response of building such as auditorium. It is also gaining importance for interactive applications such as games or virtual environments, where spatialized sound adds a stronger immersion effect. In practice, realistic sound can only be achieved by simulation of t...

The ocean is opaque to electromagnetic radiation and transparent to low-frequency sound. So acoustical methodologies are an important tool for sensing the undersea world. Stochastic sound-speed fluctuations in the ocean, such as those caused by internal waves, result in a progressive randomization of acoustic signals as they traverse the ocean environment. This signal randomization imposes a li...

In this work, we report on inelastic X-ray scattering experiments combined with the molecular dynamics simulations on deeply supercritical Ar. The presented results unveil the mechanism and regimes of sound propagation in the liquid matter and provide compelling evidence for the adiabatic-to-isothermal longitudinal sound propagation transition. We introduce a Hamiltonian predicting low-frequenc...

Activated carbon can adsorb and desorb gas molecules onto and off its surface. Research has examined whether this sorption affects low frequency sound waves, with pressures typical of audible sound, interacting with granular activated carbon. Impedance tube measurements were undertaken examining the resonant frequencies of Helmholtz resonators with different backing materials. It was found that...

The finite difference time domain (FDTD) method is commonly used as a numerically accurate way of propagating sound. However, it requires extensive computation. We present a simple method for accelerating FDTD. Specifically, we modify the FDTD update loop to prioritize computation where it is needed most in order to faithfully propagate waves through the simulated space. We estimate for each po...

Modeling acoustic propagation conditions is an important issue in underwater acoustics and there exist several mathematical/numerical models based on different approaches. Some of the most used approaches are based on ray theory, modal expansion and wave number integration techniques. Ray acoustics and ray tracing techniques are the most intuitive and often the simplest means for modeling sound...