Last Updated: 20050927, mei
P2 - Acoustics & Desktop Production
Friday, October 7, 9:30 am — 11:30 am
Chair: Brad Gover, National Research Council - Ottawa, Ontario, Canada
P2-1 Measurement of Architectural Speech Security of Closed Offices and Meeting Rooms—Bradford Gover, John Bradley, National Research Council Canada - Ottawa, Ontario, Canada
A measurement procedure has been developed for rating the architectural speech security of closed offices and meeting rooms. It is based on measuring the attenuation between average levels in the meeting room and received levels at spot locations outside the room, 0.25 m from the room boundaries. These attenuations are used with statistical distributions of speech and noise levels to calculate a suitable signal-to-noise measure. This previously derived objective measure is related to the audibility and intelligibility of the transmitted speech. The measurement at spot receiver locations allows detection and characterization of localized weak spots (“hot spots”) in the room’s boundaries.
Convention Paper 6529 (Purchase now)
P2-2 Frequency-Based Coloring of the Waveform Display to Facilitate Audio Editing and Retrieval—Stephen Rice, The University of Mississippi - University, MS, USA; Comparisonics Corporation, Grass Valley, CA, USA
The audio waveform display provides the visual focus in audio-editing systems yet sounds are difficult to see in the display. Using a new technique, the display is colored to represent the frequency content to make sounds more visible. This requires extraction of frequency information from the audio signal and an appropriate mapping of this information to the color space. Ideally, the coloring is independent of recording level, and similar sounds are represented by similar colors. Audio-editing systems are enhanced by the improved user interface. Audio-retrieval systems can present colored waveform displays as visual “thumbnails” in a list of search results.
Convention Paper 6530 (Purchase now)
P2-3 Development of Auditory Alerts for Air Traffic Control Consoles—Densil Cabrera, Sam Ferguson, University of Sydney - Sydney, NSW, Australia; Gary Laing, Airservices Australia - Brisbane, Australia
This paper documents a project that developed a hierarchical auditory alert scheme for air traffic control consoles, replacing a basic system of auditory alerts. Alerts are designed to convey the level of urgency, not provoke annoyance, be easily distinguished, minimize speech interference, and be easily localized. User evaluations indicate that the new alert scheme is highly advantageous, especially when combined with improved visual coding of alerts. The alert scheme was implemented in Australian air traffic control centers in July 2005.
Convention Paper 6531 (Purchase now)
P2-4 Multichannel Impulse Response Measurement, Analysis, and Rendering in Archaeological Acoustics—Damian Murphy, University of York - Heslington, York, UK
Developments in measuring the acoustic characteristics of concert halls and opera houses are leading to standardized methods of impulse response capture for a wide variety of auralization applications and delivery methods. This paper extends and develops these methods to nontraditional performance venues and examines how objective acoustic parameter analysis can be applied in the field of acoustic archaeology. An initial study of selected archaeological sites in the UK is presented, each site demonstrating some feature of interest in terms of its acoustic characteristics. The resulting database of measurements has a particular use in convolution-based reverberation, and an acoustic analysis of the impulse responses provides an additional insight as to the characteristics and construction of these spaces.
Convention Paper 6532 (Purchase now)