Transducers

Engineering Briefs

Chair:
Masataka Nakahara, ONFUTURE Ltd. - Tokyo, Japan; SONA Corp. - Tokyo, Japan

EB06-1 A Dante Powered Modular Microphone Array System—Mirco Pezzoli, Politecnico di Milano - Milan, Italy; Luca Comanducci, Politecnico di Milano - Milan, Italy; Joe Waltz, Eventide - Little Ferry, NJ, USA; Anthony Agnello, Eventide Inc. - Little Ferry, NJ, USA; Luca Bondi, Politecnico di Milano - Milano, IT; Antonio Canclini, Politecnico di Milano - Milan, Italy; Augusto Sarti, Politecnico di Milano - Milan, Italy
Eventide Inc. and Politecnico di Milano are collaborating to present a versatile high-performance Network Based Modular Microphone Array System (MMAS). One advantage of the system is the ability to quickly build various linear and planar array geometries with up to 64 microphone elements (sensors) connected to a single workstation, with the option to expand up to 512 sensors by synchronizing multiple sub-systems. The system modules (eStick) consist of a 48cm linear array made of 16 MEMS microphones with an integrated Audinate Dante Power-over-Ethernet (PoE) interface. The system is intended to support a wide range of industrial and research applications, ranging from advanced sound scene analysis and manipulation to source separation, extraction, and tracking. 

EB06-2 Low-Complexity Non-Linear Loudspeaker Protection—Daniil Sinev, ARKAMYS - Paris, France; Le Mans University - Le Mans, France
These days high-end loudspeakers are not seen with as much reverence as before, and the market is becoming dominated by their cheaper, more efficient counterparts. At the same time the demand for higher sound pressure levels is growing, which creates audible distortion problems. There are various DSP solutions for this, from tried-and-true fixed high pass filter, which, while getting rid of distortion, also cuts out a lot of bass frequencies, to complex new solutions based on physical models and adaptive signal processing. This paper proposes an approach that improves on the former while staying much less demanding than the latter in terms of computational power. 

EB06-3 No Presentation—N/A

EB06-4 Influence of Horn’s Surface Temperature on its Directivity Control—Dave "Rat" Levine, Rat Sound Systems - Camarillo, CA, USA; Paolo Calza, Contralto Audio srl - Parma, Italy; Mario Di Cola, Contralto Audio srl - Parma, Italy; Paolo Martignon, Contralto Audio srl - Parma (PR), Italy; Letizia Chisari, Contralto Audio srl - Milan, Italy
Horn directivity control and dispersion angles, especially at high frequency, have always been achieved by carefully design and optimized the horn’s surface. It can be experimentally demonstrated that the control properties of constant directivity, high-frequency horns may be influenced by the horn’s surface temperature which can be severely affected, for instance, by being exposed to direct sunlight. This e-brief presentation shows various experimental results that demonstrates the phenomenon and shows how much this problem can influence the directivity control at high frequency range.