Convention Program
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Systems—Jean-Marc Jot,1 Brandon Smith,2 Jeff Thompson2 room energy impulse response, elapsed times are still long when 1DTS, Inc., Los Gatos, CA, USA high spatial resolutions and/or simulations in several frequency 2 DTS, Inc., Bellevue, WA, USA bands are needed. In this work several data-parallel approaches of this finite-difference solution on Graphics Processing Units TH Dialog is often considered the most important audio element are proposed using a compute unified device architecture pro- in a movie or television program. The potential for artifact-free gramming model. A comparison of their performance running AES 139 CONVENTION dialog salience personalization is one of the advantages of new on different models of Nvidia GPUs is carried out. In general, 2D object-based multichannel digital audio formats, along with the vertical block approach running in a Tesla K20C shows the best ability to ensure that dialog remains comfortably audible in the speed-up of more than 15 times versus CPU version. presence of concurrent sound effects or music. In this paper we Convention Paper 9359 PROGRAM review some of the challenges and requirements of dialog control and enhancement methods in consumer audio systems, and their implications in the specification of object-based digital audio for- 12:00 noon mats. We propose a solution incorporating audio object loudness P1-7 An Improved and Generalized Diode Clipper Model for Wave OCTOBER 20 – NOVEMBER 1, 2015 metadata, including a simple and intuitive consumer personaliza- Digital Filters—Kurt James Werner,1 Vaibhav Nangia,1 Alberto tion interface and a practical head-end encoder extension. Bernardini,2 Julius O. Smith, III,1 Augusto Sarti2 Convention Paper 9356 1Center for Computer Research in Music and Acoustics 10:30 am (CCRMA), Stanford University, Stanford, CA, USA JACOB JAVITS CONVENTION CENTER, NY, NY 2Politecnico di Milano, Milan, Italy P1-4 Frequency-Domain Parametric Coding of Wideband Speech–A First Validation Model—Aníbal Ferreira,1 Deepen Sinha2 We derive a novel explicit wave-domain model for “diode clipper” 1University of Porto, Penafiel, Portugal circuits with an arbitrary number of diodes in each orientation, applicable, e.g., to wave digital filter emulation of guitar distor- 2 Audio Technologies and Codecs, Inc., Newark, NJ, USA At AES conventions, authors have had the option of submitting complete Session P1 Thursday, October 29 tion pedals. Improving upon and generalizing the model of Paiva 4 - to 10- page manuscripts for peer-review by subject-matter experts. The 9:00 am – 12:30 pm Room 1A08 Narrow band parametric speech coding and wideband audio cod- et al. (2012), which approximates reverse-biased diodes as open following paper has been recognized as winner of the AES 136th Conven- ing represent opposite coding paradigms involving audible infor- circuits, we derive a model with an approximated correction term tion Peer-Reviewed Paper Award. SIGNAL PROCESSING mation, namely in terms of the specificity of the audio material, using two Lambert W functions. We study the energetic proper- target bit rates, audio quality, and application scenarios. In this ties of each model and clarify aspects of the original derivation. * * * * * Chair: Scott Norcross, Dolby Laboratories, San Francisco, CA, USA paper we explore a new avenue addressing parametric coding of We demonstrate the model’s validity by comparing a modded The Winner of the 139th AES Convention wideband speech using the potential and accuracy provided by Tube Screamer clipping stage emulation to SPICE simulation. Best Peer-Reviewed Paper Award is: 9:00 am frequency-domain signal analysis and modeling techniques that Convention Paper 9360 Horns Near Reflecting Boundaries—Bjørn Kolbrek, P1-1 Time-Frequency Analysis of Loudspeaker Sound Power typically belong to the realm of high-quality audio coding. A first Norwegian University of Science and Technology, Impulse Response—Pascal Brunet, Allan Devantier, Adrian analysis-synthesis validation framework is described that illus- Session P2 Thursday, October 29 Trondheim, Norway Celestinos, Samsung Research America, Valencia, CA, USA trates the decomposition, parametric representation, and synthe- 9:00 am – 12:00 noon Room 1A07 sis of perceptually and linguistically relevant speech components Convention Paper 9412 In normal conditions (e.g., a living room) the total sound power while preserving naturalness and speaker specific information. AUDIO EDUCATION emitted by the loudspeaker plays an important role in the listening To be presented on Friday, October 30, Convention Paper 9357 experience. Along with the direct sound and first reflections, the Chair: Tim Ryan, Webster University, St. Louis, MO, USA in Session 9—Transducers—Part 3 sound power defines the loudspeaker performance in the room. * * * * * The acoustic resonances of the loudspeaker system are especially 11:00 am 9:00 am important, and thanks to spatial averaging, are more easily re- P1-5 Proportional Parametric Equalizers—Application to Digital The AES has launched an opportunity to recognize student members who vealed in the sound power response. In this paper we use time-fre- P2-1 LabVIEW as a Music Synthesizer Laboratory Learning Reverberation and Environmental Audio Processing— 1 2 author technical papers. The Student Paper Award Competition is based on quency analysis to study the spatially averaged impulse response Environment—Edward B. Stokes, Ed Doering Jean-Marc Jot, DTS, Inc., Los Gatos, CA, USA 1 the preprint manuscripts accepted for the AES convention. and reveal the structure of its resonances. We also show that the University of North Carolina at Charlotte, Charlotte, NC, USA A number of student-authored papers were nominated. The excellent 2 net effect of loudspeaker equalization is not only the attenuation of Single-band shelving or presence boost/cut filters are useful Rose-Hulman Institute of Technology, Terre Haute, IN, USA quality of the submissions has made the selection process both challenging the resonances but also the shortening of their duration. building blocks for a wide range of audio signal processing func- and exhilarating. Most electrical engineering (EE) students are familiar with Lab- Convention Paper 9354 tions. Digital filter coefficient formulas for elementary first- or The award-winning student paper will be honored during the Conven- VIEW. This graphical programming environment is commonly second-order IIR parametric equalizers are reviewed and dis- tion, and the student-authored manuscript will be considered for publica- used in university EE educational and research labs to facilitate cussed. A simple modification of the classic Regalia-Mitra design tion in a timely manner for the Journal of the Audio Engineering Society. 9:30 am data acquisition and processing using a suite of built-in math- yields efficient solutions for tunable digital equalizers whose dB ematical, DSP, and communication functions. LabVIEW is par- Nominees for the Student Paper Award were required to meet the fol- P1-2 Low-Delay Transform Coding Using the MPEG-H 3D Audio magnitude frequency response is proportional to the value of ticularly adept at emulating control panels with a variety of lowing qualifications: Codec—Christian R. Helmrich,1 Michael Fischer2 their gain control parameter. Practical applications to the design knobs, sliders, and gages. The audio functionality of LabVIEW, (a) The paper was accepted for presentation at the AES 139th Convention. 1 International Audio Laboratories, Erlangen, Germany of tone correctors, artificial reverberators and environmental along with its “knobby” user interface, makes it ideal for explora- (b) The first author was a student when the work was conducted and the 2 Fraunhofer Institute for Integrated Circuits IIS, audio signal processors are described. manuscript prepared. tion of music synthesis concepts by EE students. In this paper Erlangen, Germany Convention Paper 9358 (c) The student author’s affiliation listed in the manuscript is an accred- several types of music synthesis are explored in LabVIEW. Imple- ited educational institution. Recently the ISO/IEC MPEG-H 3D Audio standard for perceptual mentation of these in elective EE coursework gives EE students a (d) The student will deliver the lecture or poster presentation at the Convention. coding of one or more audio channels has been finalized. It is 11:30 am unique opportunity to experience abstract concepts such as wave- a little-known fact that, particularly for communication applica- forms, frequency, filtering, and envelopes through their auditory * * * * * tions, the 3D Audio core-codec can be operated in a low-latency P1-6 Comparison of Parallel Computing Approaches of a Finite- cortex, reinforcing what they have learned through traditional configuration in order to reduce the algorithmic coding/decoding Difference Implementation of the Acoustic Diffusion Equation pedagogy, and also provides EE students an introduction to some 1 1 The Winner of the 139th AES Convention delay to 44, 33, 24, or 18 ms at a sampling rate of 48 kHz. This pa- Model—Juan M. Navarro, Baldomero Imbernón, basic audio engineering (AE) concepts. 2 1 Student Paper Award is: per introduces the essential coding tools required for high-qual- José J. López, José M. Cecilia Convention Paper 9361 1Universidad Católica San Antonio - Murcia, Guadalupe Low Impedance Voice Coils for Improved Loudspeaker ity low-delay coding–transform splitting, intelligent gap filling, (Murcia), Spain Efficiency—Niels Elkjær Iversen,