The scope of this paper is the time domain simulation of the sound field radiated by a string. Different time domain methods have been successfully implemented for string simulations. These methods not only perform realtime string sound synthesis, but also pressure and particle velocity generated around strings can be obtained. It is very useful to analyze the sound field interaction with exter...

This article shows the interfacial relation in electrodynamics shall be corrected in discrete grid form which can be seen as certain numerical dispersion beyond the usual bulk type. Furthermore we construct a lossy conductor model to illustrate how to simulate more general materials other than traditional PEC or simple dielectrics, by a new conformal FDTD method which main considers the effects...

In light of the promising results obtained by driving a lowcomplexity digital waveguide (DW) violin model with synthetic bowing gestures , we currently explore the possibilities of combining DW and finite-difference time-domain (FDTD) frameworks to construct refined, yet efficient physical models of string quartet instruments. We extend previous approaches by combining a finite-width bow-string...

This paper presents a method for implementing off-grid boundary conditions (BCs) within Yee’s Finite-Difference Time-Domain (FDTD) method, without disturbing the existing uniform mesh or changing the standard FDTD code. Both perfect electric conductor (PEC) and perfect magnetic conductor (PMC) walls are considered. The field values at off-grid virtual boundaries are obtained by extrapolation of...

Visualization is an intuitive way to observe and analyse the phenomena related to the propagation of sound. It is evident that human hearing is highly capable of discriminating different aspects from an acoustic signal. The ability to discriminate is not necessarily enough to identify causality, that is answering the question: what aspect in the audio signal path, being a device or a room, cont...

In this paper we investigate the properties of two-dimensional photonic crystals (2D PhCs) with both hexagonal and square symmetry for applications in optoelectronics and telecommunication. An efficient way of manipulating the light is to make use of the defects introduced within the periodic structure, which consequently break the symmetry of the crystal, resulting in linear waveguides or reso...

SUMMARY The Finite-Difference Time-Domain (FDTD) technique is presented in this paper as an estimation method for radio propagation prediction in large and complex wireless local area network (WLAN) environments. Its validity is shown by comparing measurements and Ray-trace method with FDTD data. The 2GHz (802.lIb/g) and 5GHz (802.lIa) frequency bands are used in both the calculations and exper...