AES Dublin 2019
Poster Session P10
P10 - Poster Session 2
Thursday, March 21, 15:15 — 17:15 (The Liffey B)
P10-1 Investigation into How Reference Sources and the Experience of Technical Ear Training Work in Mixing through Headphones—Soohoon Park, Tokyo University of the Arts - Tokyo, Japan; Toru Kamekawa, Tokyo University of the Arts - Adachi-ku, Tokyo, Japan; Atsushi Marui, Tokyo University of the Arts - Tokyo, Japan
This paper reports an investigation into how reference sources and the experience of technical ear training work in mixing through headphones. In the experiment, participants were asked to adjust the EQ of the stimulus source while monitoring by using five different types of headphones respectively. There were significant differences between the two groups based on the experience of ear training and in the EQ adjustment results of the high-frequency region depending on whether or not the reference was provided. Based on the experimental results of the experiments, the mixing result has been shown to be influenced by the existence of the reference source and the experience of ear training.
Convention Paper 10163 (Purchase now)
P10-2 Proposal of Power-Saving Audio Playback Algorithm Based on Auditory Masking—Tsukasa Nakashima, Kyushu Institute of Technology - Fukuoka, Japan; Mitsuhiro Nakagawara, Panasonic Corporation - Yokohama City, Kanagawa, Japan; Mitsunori Mizumachi, Kyushu Institute of Technology - Kitakyushu, Fukuoka, Japan
Power consumption is an important issue while listening to music using portable audio devices. The authors have previously proposed a power-saving audio playback algorithm, which has adjusted filter-bank outputs according to our auditory characteristics. It succeeds in reducing power consumption but causes perceptual distortion. In this paper the power-saving audio playback algorithm is improved based on auditory masking, which attenuates audio components below the masking threshold. As a result of a listening test, it is confirmed that the proposed method is subjectively superior to the previous method with the same power consumption.
Convention Paper 10164 (Purchase now)
P10-3 Localization of Natural Sound Sources at Various Azimuth and Elevation Angles—Maksims Mironovs, University of Huddersfield - Huddersfield, West Yorkshire, UK; Hyunkook Lee, University of Huddersfield - Huddersfield, UK
A bird recording was compared against an airplane take-off sample at various azimuth and elevation angles in this study. A total of 33 source positions were tested, ranging from 0° to 180° azimuth and –30° to 90° elevation angles with 30° intervals. The results showed that both perceived azimuth and elevation are significantly affected by the source frequency content. Furthermore, a significant azimuth shift towards the lateral plane was observed on the off-center axis. This effect was stronger for the elevated positions on the rear hemisphere. Additionally, the pitch-height effect was present and was most dominant on the median plane and frontal hemisphere. Last, confusion errors were present for both stimuli; however, they were significant only on the median plane.
Convention Paper 10165 (Purchase now)
P10-4 Real-Time Measurement System Detecting Tonal Components and Determining Their Audibility in Environmental Noise—Magdalena Matys, AGH University of Science and Technology - Krakow, Poland; Kamil Piotrowski, AGH University of Science and Technology - Kraków, Poland; Tadeusz Wszolek, AGH University of Science and Technology - Krakow, Poland; Bartłomiej Kukulski, AGH University of Science and Technology - Kraków, Poland
The presence of tonal components in a sound signal usually increases its annoyance but their detection and proper qualification is not always unambiguous. Despite the relatively easy recognition of a tonal noise, its objective identification and tonality measurement is much more difficult. The identification and classification of tonal components presence in measured noise is described in the standard ISO/PAS 20065:2016(E). In this paper authors introduce a system that was created in LabVIEW environment. The main objective was to develop the easy to use system running in real-time, which is capable to perform automatic calculations based on ISO/PAS 20065:2016(E).
Convention Paper 10166 (Purchase now)
P10-5 Vertical Localization Accuracy of Binauralized First Order Ambisonics across Multiple Horizontal Positions—Connor Millns, University of Huddersfield - Huddersfield, UK; Hyunkook Lee, University of Huddersfield - Huddersfield, UK; Maksims Mironovs, University of Huddersfield - Huddersfield, West Yorkshire, UK
This presents a systematic investigation into the localization accuracy of two First Order Ambisonics (FOA) decoding methods for head-static binaural reproduction: the magnitude least squared method used in the IEM Binaural Decoder and the basic decoding method for the cube virtual loudspeaker layout. The two decoding methods were compared against a directly binauralized reference for five vertical positions (–45° to 45° at 22.5° intervals) for eight horizontal positions (0° to 315° at 45° intervals). A train of pink noise bursts were used as stimuli. Results indicate that little elevation was perceived across the tested azimuths for all three reproduction methods. The lack of elevation has implications for FOA microphone placement in terms of microphone height.
Convention Paper 10167 (Purchase now)
P10-6 A Case Study on the Perceptual Differences in Finite-Difference Time-Domain-Simulated Diffuser Designs—Julie Meyer, Aalto University - Espoo, Finland; Lauri Savioja, Aalto University - Espoo, Finland; Tapio Lokki, Aalto University - Espoo, Finland
This paper presents a method to determine if differences between the scattering created by geometrically-similar diffuser designs are perceivable. Although there exist standards to measure the scattering and diffusion coefficients, the perceptual evaluation of the scattering created by diffusing surfaces has previously been scarcely examined. In the context of the optimization of a diffuser design, such audibility study can be used to assess the relevance of optimized geometries from a perceptual point of view. The proposed approach uses ?nite-difference time-domain (FDTD) numerical simulations to generate impulse responses (IRs) from which diffuser responses of geometrically-close designs are extracted. For each diffuser geometry, a set of three such time-domain responses convolved with a click-like signal, white Gaussian noise, and a male speech, are used as stimuli in an ABX listening test. Percentage of correct answers show that subjects are able to perceive differences for the click stimulus for all tested conditions (geometries and receiver positions), while discrimination rates are mitigated across conditions for the white Gaussian noise and are not significant for the speech signal. Results also indicate that subjects’ performance depends on the receiver location.
Convention Paper 10168 (Purchase now)
P10-7 Analysis of Polish Web Streaming Loudness—Piotr Cieslik, AGH University of Science and Technology - Krakow, Poland; Karolina Szybinska, Jagiellonian University - Krakow, Poland
The aim of the study was to identify the problem related to the lack of sound normalization and law regulations in the online streaming. The method was based on analysis of samples of recorded materials from PC’s web browser players and Android and iOS apps. Samples were taken from the Polish Internet streaming stations. The data were analyzed and the results were compared. The results showed that the loudness of Polish web streaming was very differentiated. There is significant discrepancy in the loudness between the stations. Moreover, in some cases, there are substantial loudness differences between advertisements, music, and programs.
Convention Paper 10169 (Purchase now)
P10-8 Primary Study on Removing Mains Hum from Recordings by Active Tone Cancellation Algorithms—Michal Luczynski, Wroclaw University of Science and Technology - Wroclaw, Poland
In this paper the method of removing the mains hum has been presented. This method is based on active tone reduction. Active tone reduction is active noise reduction, where the secondary signal is a signal synthesized based on tonal components detected in the primary signal. The author of the paper has made tests of his own algorithm. The tested signals are the mains hum and hum with the guitar sound. The effect of the work is to indicate the advantages and disadvantages of the algorithm comparing with commonly used solutions.
Convention Paper 10147 (Purchase now)