AES Dublin 2019
Engineering Brief EB06
EB06 - Production and Simulation
Saturday, March 23, 11:15 — 12:30 (Meeting Room 3)
Ajin Tom, McGill University - Montreal, Quebec, Canada
EB06-1 The Effect of HRTF Individualization and Head-Tracking on Localization and Source Width Perception in VR—Hengwei Su, Tokyo University of the Arts - Tokyo, Japan; Atsushi Marui, Tokyo University of the Arts - Tokyo, Japan; Toru Kamekawa, Tokyo University of the Arts - Adachi-ku, Tokyo, Japan
In this study the effects of head-tracking and HRTF individualization by subjective selection on localization and width perception of widen-processed sources in VR were investigated. Localization test and the perceived width evaluation were conducted under conditions with or without head-tracking and using individualized or non-individual HRTF. For the perceived width evaluation, monophonic signals were processed by a method proposed in previous studies, which aimed to create spatial extent for sound objects in the binaural synthesis. According to the results, head-tracking not only was effective to improve localization accuracies in localization test, but also could help synthesized source widths to be localized more accurately. No difference in perceived width was found under different conditions.
Engineering Brief 520 (Download now)
EB06-2 Does Spectral Flatness Affect the Difficulty of the Peak Frequency Identification Task in Technical Ear Training? (Part 2)—Atsushi Marui, Tokyo University of the Arts - Tokyo, Japan; Toru Kamekawa, Tokyo University of the Arts - Adachi-ku, Tokyo, Japan
Technical ear training is a method to improve the ability to focus on a specific sound attribute and to communicate using the vocabularies and units shared in the industry. In designing the successful course in a sound engineers’ educational institution, it is essential to have the gradual increase of the task difficulty. In this e-Brief the authors report the relation between spectral envelope modifications on the music excerpts and the resulting objective score through the training, with variations on the music excerpts and difficulty levels.
Engineering Brief 521 (Download now)
EB06-3 Generalized Image Source Method as a Region-to-Region Transfer Function—Thushara Abhayapala, Australian National University - Canberra, ACT, Australia; Prasanga Samarasinghe, Australian National University - Canberra, Australia
Sound propagation inside reverberant rooms is an important topic of research. This is due to its impact on a plethora of applications especially in spatial audio. Room transfer function (RTF) simulations methods play a major role in testing new algorithms before implementing them. Allen and Berkley’s image source method for simulating room transfer function has recently been generalized  to incorporate arbitrary source and receiver directivity patterns. In this paper we further illustrate potential applications of the generalized model for recording, reproduction, and manipulating spatial audio within reverberant rooms. We provide detailed mathematical equations of (i) generalized image source method, (ii) its interpretation as a model for region-to-region transfer functions, and (iii) an outline of potential applications of the model.
Engineering Brief 522 (Download now)
EB06-4 Experimenting with Lapped Transforms in Numerical Computation Libraries Using Polyphase Matrices and Strided Memory Views—Nils Werner, International Audio Laboratories Erlangen - Erlangen, Germany; Bernd Edler, International Audio Laboratories Erlangen - Erlangen, Germany
In this brief we present a framework for experimenting with lapped linear transforms in modern numerical computation libraries such as NumPy and Julia. We make use of the fact that these transforms can be represented as matrices (and oftentimes as sparse factorizations thereof), and that numerical computation libraries often support strided memory views. This strided memory view very elegantly solves the problem of processing several overlapping frames at once, while simultaneously allowing vectorization.
Engineering Brief 523 (Download now)