This paper presents a physical demonstration of an audio-range line array used to teach interference of multiple sources in a classroom or laboratory exercise setting. Software has been developed that permits real-time control and steering of the array. The graphical interface permits a user to vary the frequency, the angular response by phase shading, and reduce sidelobes through amplitude sha...

Active diffuse loudspeaker arrays can be implemented by incorporating a distribution of small radiating elements each characterized by processes that embed a unique diffuse impulse response. The properties of synthetic diffuse impulses are investigated both individually and collectively and algorithmic generation techniques presented. The diffuse properties of such synthetic arrays are confirme...

The loudspeaker is the most important and one of the most variable elements in the electroacoustic music performance process. Nonetheless, its performance is subject to a “willing suspension of disbelief” by listeners. In addition, its behavior and variability are usually not accounted for in assessments of the quality of music reproduction or music instrument synthesis, especially as they occu...

The implementation of simple virtual source models like plane and spherical waves in wave field synthesis employs delays which are applied to the input signals. We present a formal experiment evaluating the perceptual consequences of different accuracies of these delays. Closely related to the question of delay accuracy is the accuracy of the loudspeaker positioning. The second part of the pres...

An embedded acoustic instrument is an embedded musical instrument that provides a direct acoustic output. This paper describes how to make embedded acoustic instruments using laser cutting for digital fabrication. Several tips are given for improving the acoustic quality including: employing maximally stiff material, placing loudspeaker drivers in the corners of enclosure faces, increasing the ...

Vector base amplitude panning (VBAP) is a generic method for virtual source positioning. It generalizes the pair-wise panning paradigm to triplet-wise panning paradigm, which can be used in three-dimensional loudspeaker setups. The VBAP implementation in MAX/MSP software presented in this paper is a powerful tool to produce spatialized computer music pieces that can be presented with di erent l...

Based on a simplified nonlinear lumped element model of the electrodynamic loudspeaker in either a closed or a vented cabinet, a new nonlinear controller is derived, simulated and implemented on a DSP. The Volterra series expansion, a well known functional expansion to model nonlinear systems, is used to estimate the nonlinear parameters from distortion measurements. The controller is directly ...

The apparent position of speech and music sound sources was investigated using both a two channel loudspeaker array and a three channel loudspeaker array. The results showed that a sine-cosine pan law was reasonably accurate for the three channel array, but consistently produced sharp images who’s positions were consistently wider than expected with a two channel array. The discrepancy was inve...

A freely available collection of Head-Related Impulse Response (HRIR) measurements is introduced. The impulse responses were acquired in an anechoic chamber using a KEMAR manikin at four different loudspeaker distances – 3m, 2m, 1m and 0.5m – reaching from the far field to the near field. The loudspeaker was positioned at ear height and the manikin was rotated with a high-precision stepper moto...

This paper presents an implementation for dynamic two or three dimensional spatial distribution of granulated sound (or granular synthesis) over an arbitrary loudspeaker system.