ISEAT 2024
General Information Location: Discover more on the official ISEAT website!
| The 9th International Symposium on Electroacoustic Technologies (ISEAT) is scheduled to be held in Shenzhen, China in 2024, serving as a prominent platform for global academic exchange in electroacoustics and its associated fields. The symposium is organized by Shenzhen Research Institute of Nanjing University, and hosted by Professor Yong Shen of Nanjing University, who is currently the director of the Acoustics R&D Center of Shenzhen Research Institute of Nanjing University, the fellow of the Chinese Institute of Electronics, a council member of the Acoustical Society of China, and the head of the Expert Group of the Electro-Acoustical Branch of China Electronic Components Association. ISEAT has been held every other year since 2007, earning a worldwide reputation in the field of electroacoustics and its peripheral domains. More than 700 attendees, including prestigious scholars, renowned experts, senior engineers, senior managers, technology decision-makers, and industrial elites, are going to participate in the forthcoming 9th ISEAT to share and communicate with each other about their latest discoveries and developments in the applications for new technologies, materials, and equipment. Be part of the conference, meet our engineers and join their presentations. ISEAT 2024 Exhibition
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Experience our Paper Sessions
Acoustical Measurement of TV, Monitors, Flat panels and Loudspeaker with distributed sound sources
by Stefan Irrgang (KLIPPEL GmbH, Dresden, Germany) and Wolfgang Klippel (Technical University, Dresden, Germany)
Abstract: Contrary to the tendency to create more miniature loudspeakers, there are modern sound techniques by exciting panels, screens, or other existing mechanical structures with shakers or using many transducers in loudspeaker arrays for beamforming, beam-steering, and other 3D applications. All those large loudspeakers on their surface distributed sound sources, generating a complicated near field and a unique directivity pattern in the far field. A new standard, IEC 60268-23, based on recent research on this topic, defines new measurement techniques coping with the acoustical particularities of this group of loudspeakers. This paper describes the physical challenges and the practical solutions the standard provides.
Measuring the nonlinear, lossy, frequency-dependent voice coil inductance
by Jonathan Gerbet (KLIPPEL GmbH, Dresden, Germany) and Wolfgang Klippel (Technical University, Dresden, Germany)
Abstract: The voice coil in electro-dynamic transducers transforms an alternating electrical current into movements that produce sound. An undesirable effect of this principle is the coil’s self-inductance. This is highly dependent on the voice coil position and cannot be assumed to be constant. In addition to this, the inductance nonlinearity cannot be described by a single static nonlinear function because eddy currents, the skin effect and the induced voltage in shorting material such as copper rings cause it to be frequency-dependent. These effects decrease the voltage sensitivity and efficiency of the transducer and create nonlinear distortion which degrades the audio quality. Additionally, DC displacements caused by the reluctance force created by the in homogeneously distributed magnetic AC flux decrease the transducer robustness and maximum excursion. One option for measuring the nonlinear frequency-dependent inductance and magnetic losses involves performing multiple small signal measurements at various clamped voice coil positions. A much faster and novel technique involves performing a large signal measurement using a multi-tone stimulus. This can be used to identify parameters for a nonlinear dynamic inductance model. Both methods are used and discussed in this paper. The resulting measurements are used to create a meaningful set of easily interpretable results which are discussed alongside FEA simulations.