AES Los Angeles 2016
Engineering Brief EB1
EB1 - Posters: Spatial Audio & Transducers
Thursday, September 29, 10:45 am — 12:15 pm (Rm 403B)
EB1-1 A Ground Plane Measurement Comparison Between Two Floor-Standing Loudspeaker Systems: A Conventional Three-Way Studio Monitor vs. A Ground-Plane Constant Beamwidth Transducer (CBT) Line Array—D.B. (Don) Keele, Jr., DBK Associates and Labs - Bloomington, IN, USA
This paper compares two different types of floor-standing loudspeaker systems. Both were measured over an acoustically reflective hard surface in a large space. The first is a high-performance conventional three-way 12”-woofer studio monitor and the second is a ground-plane circular-arc CBT line array loudspeaker. Measurements included direct-field frequency responses in front of the systems at 20 grid locations ranging over different distances/heights and response vs. distance at seated and standing heights. Horizontal off-axis and near-field responses were also gathered along with ceiling illumination responses at several launch angles. The measurements reveal that the CBT system has vastly more even coverage at all these locations compared to the three-way monitor and in addition eliminates the detrimental effects of floor bounce.
Engineering Brief 279 (Download now)
EB1-2 A 3D Sound Localization System Using Two Side Loudspeaker Matrices—Ryo Kaneta, University of Aizu Graduate School - Aizuwakamatsu-city, Fukushima-prefecture, Japan; Akira Saji, University of Aizu - Aizuwakamatsu City, Japan; Jie Huang, University of Aizu - Aizuwakamatsu City, Japan
We have been researching about 3D spatial sound localization using loudspeakers. However, loudspeaker systems using VBAP methods, usually need a large listening space and a lot of loudspeakers. In this paper we propose a loudspeaker matrix system to improve sound localization on 3D sound system for personal use. Four loudspeakers were set on all vertices of 25 centimeters regular square, 2 matrices on both sides of the listener. Then, we have held audio experiments to confirm the effect of the matrix system. As a result, the loudspeaker matrices system can improve sound localization especially with higher elevation.
Engineering Brief 280 (Download now)
EB1-3 Source-Distance Based Panning Algorithm (SDAP) for 3D Surround Sound—Matthew Wong, Rochester Institute of Technology - Rochester, NY, USA; Sungyoung Kim, Rochester Institute of Technology - Rochester, NY, USA
The Source-Distance Based Amplitude Panning (SDAP) algorithm offers a new approach in determining gain amounts for distributed loudspeakers in a three-dimensional (3D) space. Similar to the 3D implementation of Vector Based Amplitude Panning (VBAP), this method is based on the use of non-overlapping triangular regions formed by the known locations of sets of three loudspeakers. Unlike VBAP, however, this method compares the location of the panning vector to the surface formed by the triangular region and uses Barycentric coordinates to determine the speakers' respective amplitudes. In addition, SDAP removes the possibility of negative amplitudes as may appear in VBAP. Informal listening test results showed that the perceived position of the sound source was perceptually well matched to the target position.
Engineering Brief 281 (Download now)
EB1-4 STEAK: Backward-Compatible Spatial Telephone Conferencing for Asterisk—Dennis Guse, Technische Universität Berlin - Berlin, Germany; Frank Haase, Technische Universität Berlin - Berlin, Germany
In this paper we present our implementation of a telephone conferencing system that renders a spatial representation via binaural synthesis. The implementation extends the open-source software Asterisk and complies with established Voice-over-IP standards. The implementation only requires clients to be capable of receiving and reproducing the rendered binaural signals (two channels). Furthermore, the implementation is backward-compatible as clients not fulfilling these requirements are provided with mono-rendered signals without additional spatial information. The implemented system is released as open-source software and will enable researchers to investigate the (dis-)advantages of spatial conferencing under real-world conditions. The project name is Spatial TelephonE conferencing for AsterisK (STEAK)
Engineering Brief 282 (Download now)
EB1-5 Process of HRTF Individualization by 3D Statistical Ear Model—Slim Ghorbal, 3D Sound Labs - Rennes, France; CentraleSupélec - Rennes, France; Renaud Séguier, 3D Sound Labs - Port Marly, France; Xavier Bonjour, 3D Sound Labs - Cesson-Sevigne, France
The use of HRTFs is of well-known importance when it comes to binaural listening. However, easily capturing accurate data is a key point that has not been solved yet. In this paper we present a process for individualizing the HRTFs of an individual using ear photographs. These are fitted to a statistical 3D ear model coupled to a statistical HRTF model. This coupling allows to instantly generate from a given parameterization of the ear model a corresponding set of HRTFs. The accuracy of the results is a direct consequence of the quality and the size of the underlying databases.
Engineering Brief 283 (Download now)
EB1-6 Evaluation of Portable Loudspeakers Using Virtual Listening Test—Ziyun Liu, Nanjing University - Nanjing, China; Yong Shen, Nanjing University - Nanjing, Jiangsu Province, China; Pei Yu, Nanjing University - Nanjing, China; Hao Yin, Nanjing University - Nanjing, China
The audio quality of portable wireless speakers for consumer use has improved in recent years. In this study perceptual evaluations of several portable loudspeaker systems were performed using virtual listening test methods. A preference test was designed to assess the comparative performance of these loudspeakers. The recordings of each loudspeaker were done in a controlled situation and then the listening panel took the listening test by headphone playbacks. Considering the wide use of bass-boost effect in these products, perceptual qualities of both high playback level and low level were investigated. Several objective measures were also applied to these loudspeakers. The results of the listening test and objective measures were compared and discussed.
Engineering Brief 284 (Download now)