AES New York 2007
Perception, Part 3
Paper Session P6
Saturday, October 6, 9:00 am — 12:00 pm
Chair: Brent Edwards, Starkey Hearing Research Center - Berkeley, CA, USA
P6-1 Deriving Physical Predictors for Auditory Attribute Ratings Made in Response to Multichannel Music Reproductions—Sungyoung Kim, William Martens, McGill University - Montreal, Quebec, Canada
A group of eight students engaged in a Tonmeister training program were presented with multichannel loudspeaker reproductions of a set of solo piano performances and were asked to complete two attribute rating sessions that were well separated in time. Five of the eight listeners produced highly consistent ratings after a six-month period during which they received further Tonmeister training. Physical predictors for the obtained attribute ratings were developed from the analysis of binaural recordings of the piano reproductions in order to support comparison between these stimuli and other stimuli, and thereby to establish a basis for independent variation in the attributes to serve both creative artistic goals and further scientific exploration of such multichannel music reproductions.
Convention Paper 7195 (Purchase now)
P6-2 Interaction between Loudspeakers and Room Acoustics Influences Loudspeaker Preferences in Multichannel Audio Reproduction—Sean Olive, Harman International Industries, Inc. - Northridge, CA, USA; William Martens, McGill University - Montreal, Quebec, Canada
The physical interaction between loudspeakers and the acoustics of the room in which they are positioned has been well established; however, the influence on listener preferences for loudspeakers that results from such variation in room acoustics has received little experimental verification. If listeners adapt to listening room acoustics relatively quickly, then room acoustic variation should not significantly influence loudspeaker preferences. In the current paper two groups of listeners were given differential exposure to listening room acoustics via a binaural room scanning (BRS) measurement and playback system. Although no significant difference in loudspeaker preference was found between these two groups of listeners, the room acoustic variation to which they were exposed did significantly influence loudspeaker preferences.
Convention Paper 7196 (Purchase now)
P6-3 Evaluating Off-Center Sound Degradation in Surround Loudspeaker Setups for Various Multichannel Microphone Techniques—Nils Peters, Stephen McAdams, McGill University - Montreal, Quebec, Canada; Jonas Braasch, Rensselaer Polytechnic Institute - Troy, NY, USA
Many listening tests have been undertaken to estimate listeners' preferences for different multichannel recording techniques. Usually these tests focus on the sweet spot, the spatial area where the listener maintains optimal perception of virtual sound sources, thereby neglecting to consider off-center listening positions. The purpose of the present paper is to determine how different microphone configurations affect the size of the sweet spot. A perceptual method is chosen in which listening impressions achieved by three different multichannel recording techniques for several off-center positions are compared with the listening impression at the sweet spot. Results of this listening experiment are presented and interpreted.
Convention Paper 7197 (Purchase now)
P6-4 The Effects of Latency on Live Sound Monitoring—Michael Lester, Jon Boley, Shure Incorporated - Niles, IL, USA
A subjective listening test was conducted to determine how objectionable various amounts of latency are for performers in live monitoring scenarios. Several popular instruments were used and the results of tests with wedge monitors are compared to those with in-ear monitors. It is shown that the audibility of latency is dependent on both the type of instrument and monitoring environment. This experiment shows that the acceptable amount of latency can range from 42 ms to possibly less than 1.4 ms under certain conditions. The differences in latency perception for each instrument are discussed. It is also shown that more latency is generally acceptable for wedge monitoring setups than for in-ear monitors.
Convention Paper 7198 (Purchase now)
P6-5 A Perforated Desk Surface to Diminish Coloration in Desktop Audio-Production Environments—Karl Gentner, BRC Acoustics & Technology - Seattle, WA, USA; Jonas Braasch, Paul Calamia, Rensselaer Polytechnic Institute - Troy, NY, USA
In audio-production rooms, a common source of harmful reflections is the mixing console or desk surface itself. A perforated material is proposed as an alternative desk surface to reduce coloration by achieving acoustical transparency. A variety of desk surfaces and perforation schemes were tested within common room conditions. The resulting psychoacoustic study indicates that the fully-perforated desk provides lower coloration than that of the solid desk in every condition. A partially-perforated desk shows a similar decrease in coloration, specifically when the perforated area is determined by the Fresnel zones dictated by the source and receiver positions.
Convention Paper 7199 (Purchase now)
P6-6 Perceptually Modeled Effects of Interchannel Crosstalk in Multichannel Microphone Technique—Hyun-Kook Lee, LG electronics - Seoul, Korea; Russell Mason, Francis Rumsey, University of Surrey - Guildford, Surrey, UK
One of the most noticeable perceptual effects of interchannel crosstalk in multichannel microphone techniques is an increase in perceived source width. The relationship between the perceived source-width-increasing effect and its physical causes was analyzed using an IACC-based objective measurement model. A description of the measurement model is presented, and the measured data obtained from stimuli created with crosstalk and those without crosstalk are analyzed visually. In particular, frequency and envelope dependencies of the measured results and their relationship with the perceptual effect are discussed. The relationship between the delay time of the crosstalk signal and the effect of different frequency content on the perceived source width is also discussed in this paper.
Convention Paper 7200 (Purchase now)
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