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Convention Program, 2018 Spring Erating the Required Sound Output with Minimum 4Th Order Bandpass Enclosure Design for a Subwoofer to Size, Weight, Cost, and Energy

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Convention Program, 2018 Spring Erating the Required Sound Output with Minimum 4Th Order Bandpass Enclosure Design for a Subwoofer to Size, Weight, Cost, and Energy AES 144TH CONVENTION OCT PROGRAM MAY 23–MAY 26, 2017 NH HOTEL MILANO, CONGRESS CENTRE, MILAN The Winner of the 144th AES Convention To be presented on Thursday, May 24 Best Peer-Reviewed Paper Award is: in Session 10—Audio Coding, Analysis, and Synthesis * * * * * Real-Time Conversion of Sensor Array Signals into Spherical Harmonic Signals with Applications to Spatially Localized Sub-Band Sound-Field Technical Comittee Meeting Analysis—Leo McCormack,1 Symeon Delikaris- Wednesday, May 23, 09:00 – 10:00 Room Brera 1 Manias,1 Angelo Farina,2 Daniel Pinardi,2 Ville Pulkki1 1 Aalto University, Espoo, Finland Technical Committee Meeting on Recording Technology 2 Università di Parma, Parma, Italy and Practices Convention Paper 9939 Tutorial 1 Wednesday, May 23 09:15 – 10:15 Scala 2 To be presented on Thursday, May 24 in Session 7—Spatial Audio—Part 1 CRASH COURSE IN 3D AUDIO * * * * * The AES has launched an opportunity to recognize student mem- Presenter: Nuno Fonseca, Polytechnic Institute of Leiria, bers who author technical papers. The Student Paper Award Com- Leiria, Portugal; Sound Particles petition is based on the preprint manuscripts accepted for the AES convention. A little confused with all the new 3D formats out there? Although A number of student-authored papers were nominated. The ex- most 3D audio concepts already exist for decades, the interest in cellent quality of the submissions has made the selection process 3D audio has increased in recent years, with the new immersive both challenging and exhilarating. formats for cinema or the rebirth of Virtual Reality (VR). This The award-winning student paper will be honored during the tutorial will present the most common 3D audio concepts, formats, Convention, and the student-authored manuscript will be consid- and technologies allowing you to finally understand buzzwords ered for publication in a timely manner for the Journal of the Audio like Ambisonics/HOA, Binaural, HRTF/HRIR, channel-based audio, Engineering Society. object-based audio, Dolby Atmos, among others. Nominees for the Student Paper Award were required to meet the following qualifications: Workshop 1 Wednesday, May 23 (a) The paper was accepted for presentation at the AES 144th 09:15 – 10:15 Scala 3 Convention. (b) The first author was a student when the work was conducted CANCELED and the manuscript prepared. (c) The student author’s affiliation listed in the manuscript is an Session P1 Wednesday, May 23 accredited educational institution. 09:30 – 12:30 Scala 4 (d) The student will deliver the lecture or poster presentation at the Convention. * * * * * LOUDSPEAKERS—PART 1 The Winner of the 144th AES Convention Chair: Angelo Farina, University of Parma, Parma, Italy Student Paper Award is: 09:30 Bandwidth Extension Method Based on Generative Adversarial Nets for Audio Compression— P1-1 Maximizing Efficiency in Active Loudspeaker Systems— Qingbo Huang, Xihong Wu, Tianshu Qu, Wolfgang Klippel, Klippel GmbH, Dresden, Germany Peking University, Beijing, China Increasing the efficiency of the electro-acoustical Convention Paper 9954 conversion is the key to modern audio devices gen- 1 Audio Engineering Society 144th Convention Program, 2018 Spring erating the required sound output with minimum 4th order bandpass enclosure design for a subwoofer to size, weight, cost, and energy. There is unused po- achieve a high peak in the passband and increase voltage tential for increasing the efficiency of the electro- sensitivity is investigated. The response is corrected with dynamical transducer by using a nonlinear motor topol- DSP to ensure a flat response in the passband. The results ogy, a soft suspension, and cultivating the modal reso- proved that this approach can increase the voltage sensi- nances in the mechanical and acoustical system. How- tivity dramatically, reaching an average sensitivity of over ever, transducers optimized for maximum efficiency are 100 dB in the passband from 45 Hz to 90 Hz. It also showed more prone to nonlinear and unstable behavior. Nonlinear that the design is sensitive to construction errors. Precise adaptive control can compensate for the undesired signal assembling is required to achieve satisfactory results distortion, protect the transducer against overload, stabi- while small errors can ruin the purpose of the design. lize the voice coil position, and cope with time varying Convention Paper 9911 properties of the suspension. The paper discusses the de- sign of modern active systems that combine the new op- 11:30 portunities provided by software algorithms with the op- timization of the hardware components in the transducer P1-5 Parameterization of Micro Speakers Used in Cell and power amplifier. Phones and Earbuds—Jason McIntosh, SAATI SPA, Convention Paper 9908 Appiano Gentile (C0), Italy Loudspeaker parameterizations based on measuring a 10:00 transfer matrix is presented. This approach produces nine P1-2 How Do We Make an Electrostatic Loudspeaker with complex frequency dependent functions. While Thiele- Constant Directivity?—Tim Mellow, Mellow Acoustics Small parameters only capture the first piston mode of Ltd., Farnham, Surrey, UK a moving coil speaker, the transfer matrix approach cap- tures all the linear behavior of the speaker, including the The idea of broadening the directivity pattern of a push- diaphragm modes and internal geometry. Predictions of pull electrostatic loudspeaker by partitioning the stators baffled response of two speakers are presented with the into concentric annular rings, which are connected to transfer matrix parameters producing better results than tappings along a delay line, isn’t new. However, the delay the Thiele-Small parameters, especially at high frequen- line has traditionally been attenuated to avoid response cies. The SAATI “Ares” acoustic simulator uses the trans- irregularities due to the finite size of the membrane. An fer matrix parameters for effective simulation of complete alternative approach is presented here whereby a con- devices, including proper porting geometry and dampen- stant-impedance delay line is configured to imitate an ing acoustic meshes for better audio tuning. oscillating sphere, which is an ideal constant-directivity Convention Paper 9912 dipole source that needs no attenuation. Walker’s equa- tion for the on-axis pressure does not account for the ef- 12:00 fect of the delay line without taking the vector sum of the currents though all the rings, so a simple alternative that P1-6 A Fast And Efficient Model for Transmission Line does is presented here. Loudspeakers—James Hipperson,1,2 Jamie Angus,1,3 Convention Paper 9909 Jonathan Hargreaves1 1University of Salford, Salford, UK 2 10:30 16 Longhurst House, Horsham, UK 3 JASA Consultancy, York, UK P1-3 Analysis of Front Loaded Low Frequency Horn Loud- speakers—Bjørn Kolbrek, Celestion International Ltd., Transmission Line loudspeakers use a tube behind the Ipswich, UK driver that is lined, or filled, with absorber to remove the rear radiation. They also use the resonances of the The low frequency horn design procedures described by pipe to support the radiation of the driver and reduce Keele and Leach are extended and generalized to cases displacement at low frequencies. While lumped element where the horn is already specified, or where maximum models are used for modeling sealed and vented box output or the smoothest response is desired. The impact enclosures, they cannot be used for transmission line of finite-length horns is analyzed. A more detailed analysis loudspeakers because they cannot be accurately mod- of the high frequency range is given, where it is shown eled as a lumped element. Finite Element and Boundary how the voice coil inductance can be taken into account Element models can be used but they are complex and to create a third order low pass filter of specified shape. computationally expensive. A cascaded two port method A new analysis of reactance annulling is presented that has been developed that can model varying tube area and significantly improves the performance above cutoff for absorption. It has been evaluated against acoustic mea- a certain class of horns. Large signal behavior is touched surements and shown to provide accurate predictions. upon, and finally, an analysis of the sensitivity of driver Convention Paper 9913 and system parameters is given. Convention Paper 9910 Tutorial 2 Wednesday, May 23 09:30 – 11:00 Scala 1 11:00 P1-4 Design and Implementation of a High Efficiency REUSING AND PROTOTYPING TO ACCELERATE Subwoofer—Sebastian Tengvall, Niels Elkjær Iversen, INNOVATION IN AUDIO SIGNAL PROCESSING Arnold Knott, Technical University of Denmark, Kgs. Lyngby, Denmark Presenters: Gabriele Bunkheila, MathWorks, Cambridge, UK The demand for battery driven loudspeakers is increasing Jonas Rutstrom, MathWorks, Sollentuna, Sweden but the challenge of efficient low frequency reproduction remains. An alternative approach to the conventional Voice assistants are shifting consumer expectations on perfor- 2 Audio Engineering Society 144th Convention Program, 2018 Spring mance and capabilities of audio devices and human-machine inter- Session P2 Wednesday, May 23 faces. As new products are driven to deliver increasingly complex 10:30 – 12:30 Scala 2 features, successful manufacturers and IP providers need to reuse more design assets, deliver original innovation more efficiently, AUDIO QUALITY—PART 1 and prototype more quickly than ever before. In this session you will learn about different techniques to integrate existing code and
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