AES Budapest 2012
Poster Session P21
P21 - Audio Equipment and Instrumentation
Sunday, April 29, 12:00 — 13:30 (Room: Foyer)
P21-1 Evaluation of Vibrating Sound Transducers with Glass Membrane Based on Measurements and Numerical Simulations—György Wersényi, Széchenyi István University - Györ, Hungary
In recent years manufacturers introduced so-called "invisible sound" solutions. In-wall, surface mount, or glass mount versions of different vibrating transducers are commercially available. The entire surface becomes a loudspeaker delivering sound, and the frequency response is said to be equivalent to conventional diaphragm speakers. Furthermore, the sound is omnidirectional at nearly all frequencies (60 Hz – 15 kHz) while channel separation is maintained. This paper presents measurement results of the SolidDrive SD1g transducer mounted on different glass surfaces, including vibration measurements and acoustic parameters. Furthermore, based on a numerical FEM-model using COMSOL, comparison between measured and simulated results and estimation of transfer function and directional characteristics are presented.
Convention Paper 8675 (Purchase now)
P21-2 Voicecoil Inter-Turn Faults Modeling and Simulation—German Ruiz, J. A. Ortega, J. Hernández, UPC-Universitat Politecnica de Catalunya - Terrassa, Spain
The purpose of this paper is to present a new model to study intern-turn short circuit faults in a dynamic loudspeaker. The loudspeaker is modeled by using a classical voice coil parametric model attached to a mechanical piston, and the equations are modified to take into account the voice coil inter-turn faults. The loudspeaker model is global and can work in both normal and fault conditions due to a fictitious resistance in the winding circuit. Various simulation results have been presented indicating the fault instant in time and its corresponding effect in power spectral density. The model can serve as a step toward development of fault detection and diagnosis algorithm.
Convention Paper 8676 (Purchase now)
P21-3 Headphone Selection for Binaural Synthesis with Blocked Auditory Canal Recording—Florian Völk, AG Technische Akustik, MMK, Technische Universität München - Munich, Germany
Binaural synthesis aims at eliciting the reference scene hearing sensations by recreating the sound pressures at the eardrums, typically using headphones. If all transfer functions involved are approximated based on eardrum probe microphone or traditional artificial head measurements, the headphones have been shown not to influence the synthesis. It is also possible to achieve correct binaural synthesis with transfer functions measured at the entrances to the blocked auditory canals. Then, the headphones may influence the results. In this paper a blocked auditory canal headphone selection criterion (HPC) for binaural synthesis is proposed. Further, a procedure is derived, which allows to evaluate the (HPC) for specific circum-aural headphones based on four measurements using a specifically designed artificial head.
Convention Paper 8677 (Purchase now)
P21-4 A Low Latency Multichannel Audio Processing Evaluation Platform—Yonghao Wang, Queen Mary University of London - London, UK; Xiangyu Zhu, Hebel University of Science and Technology - Shijiazhuang, China; Qiang Fu, Shijiazhuang Mechanical Engineering College - Shijiazhuang, China
For live digital audio system with high-resolution multichannel functionalities, it is desirable to have accurate latency control and estimation over all of the stages of the digital audio processing chain. The evaluation system we designed supports 12 channel- 24-bit sigma delta based ADC/DAC, incorporating both a programmable FPGA and digital signal processor. It can be used for testing and evaluation of different ADC/DAC digital filter architectures, audio sample buffer subsystem design, interrupt and scheduling, high level audio processing algorithms, and other system factors that might cause the latency effects. It also can estimate the synchronization and delay of multiple channels.
Convention Paper 8678 (Purchase now)
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