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AES Barcelona 2005
Poster Session Z2 - Digital Audio Techniques

Last Updated: 20050331, mei

Saturday, May 28, 15:00 — 16:30

Z2-1 An Approach to Analogous Circuits of Acoustical and Mechanical Systems by Means of Problem-Based LearningMiguel Romá, Basilio Pueo, José Escolano, University of Alicante - Alicante, Spain
Maybe the most difficult aspects in electroacoustics training are those concerning modeling acoustical and mechanical systems by means of their analogous circuits. An adaptation of the problem-based learning model for these question is proposed, with the corresponding sequence of activities. A logical, progressive approaching is achieved, allowing the students a less aggressive way toward analogous components, models, and circuits.
Convention Paper 6349 (Purchase now)

Z2-2 Development of a Computer-Based Violin Teaching Aid: ViToolJane Charles, Dublin Institute of Technology - Dublin, Ireland; Derry Fitzgerald, Cork Institute of Technology - Cork, Ireland; Eugene Coyle, Dublin Institute of Technology - Dublin, Ireland
This paper considers the development of a violin teaching aid, called ViTool, which is based on violin pedagogy, sound analysis, and comparison of beginner and good player recordings. It is a computer-based teaching aid and will ultimately consist of at least four task dependent tools. Typical beginner faults have been identified and features, that best describe them for classification purposes, are considered. The ViTool is not intended as a replacement or electronic teacher, but as a teaching aid. Presently, it seems that no such violin learning aid or tool exists and an opportunity exists for the development of such home learning aids. This paper puts forward the initial steps toward such a teaching aid.
Convention Paper 6350 (Purchase now)

Z2-3 Interface Design as Part of an Audio Technology DegreePatrick Quinn, John Lynn, Glasgow Caledonian University - Glasgow, Scotland, UK
Given the complexity of audio equipment and software it is surprising the lack of published research into the design and evaluation of the interfaces for such technology. In recognition of the importance of this area of design, students on the BSc(Hons) Audio Technology programs at Glasgow Caledonian University study the theory and practice of interface design as part of their degree studies. This paper looks at the aims of the syllabus covered, its main influences, and issues surrounding its implementation.
Convention Paper 6351 (Purchase now)

Z2-4 Lossless Compression of IEEE Floating-Point Audio Using Approximate-Common-Factor CodingNoboru Harada, Takehiro Moriya, Hiroshi Sekigawa, Kiyoshi Shirayanagi, NTT Corporation - Atsugi, Kanagawa, Japan
In this paper a lossless compression scheme for the IEEE floating-point audio data is proposed. The main ideas are to use Approximate Common Factor Coding for the preprocessing of the floating-point data compression and to use Masked Lempel-Ziv compression for the remaining residuals after float-to-integer mapping. This scheme can extremely reduce bit rates, especially when the input values in a frame are constructed by multiplication of the sequence of integer values and a floating-point constant. This scheme has been proposed to the MPEG-4 ALS (Audio Lossless Coding) core experiment to be part of the reference model.
Convention Paper 6352 (Purchase now)

Z2-5 New Algorithms for Wow and Flutter Detection and Compensation in AudioAndrzej Czyzewski, Marek Dziubinski, Andrzej Ciarkowski, Maciej Kulesza, Przemyslaw Maziewski, Jozef Kotus, Gdansk University of Technology - Gdansk, Poland
New algorithms were developed for discriminating wow from natural musical effects, such as: periodicity detection by means of an autocorrelation signal, algorithms employing an AR model for power line hum frequency detection, and an algorithm for estimating the pitch variation curve employing wow tracking based on recording bias detection in magnetic recordings. Moreover, a nonuniform resampling routine was implemented and applied to wow compensation. The developed algorithms were studied using real audio examples allowing a comparison of their effectiveness.
Convention Paper 6353 (Purchase now)

Z2-6 Sound Editing Workflows and Technologies for Digital Film—The Nonlinear SoundtrackJohn McKay, Virtual Katy - Wellington, New Zealand
Advancements in nonlinear editing technology have enabled directors to modify their film project at any point during the postprocess. This freedom provides significant creative flexibility. However, the technologies for sound and film editing are not fully integrated and pose a challenge for sound editors keeping sync with film edits and changes. This paper introduces new workflows and technologies that enable sound editors to work in tandem with the changing film and automate manual processes in a collaborative nonlinear environment. These new workflows and changing technologies will be described using a real-world motion picture case study—The Lord of the Rings.
Convention Paper 6354 (Purchase now)

Z2-7 Road Traffic Monitoring Using a Two-Microphone ArrayOrla Duffner, Noel O’Connor, Noel Murphy, Alan Smeanton, Sean Marlow, Dublin City University - Dublin, Ireland
A passive traffic monitoring technique is presented that uses two omnidirectional microphones to detect and localize the acoustic pattern of road vehicles. This method uses the cross-power spectrum phase version of the generalized cross correlation algorithm for time delay estimation to emphasize passing concentrated wideband sound sources. Key traffic flow data such as vehicle location, speed, and density are extracted by means of creative pattern recognition including directional filtering, that exploits the acoustical correlation signature of a passing vehicle. Experiments are based on real traffic data in typical conditions. Compared to existing traffic sensors this technique is economically advantageous and nonintrusive.
Convention Paper 6355 (Purchase now)

Z2-8 Comparison of Different Listening Systems for Speech Intelligibility TestsAndrea Azzali, Paolo Bilzi, Eraldo Carpanoni, Angelo Farina, University of Parma - Parma, Italy
Being able to have a fast and reliable evaluation of speech intelligibility inside cars is of utmost importance during the interior-design phase. Performing subjective tests inside car compartments is a time consuming task and therefore not suitable for industrial processes. Moreover, comparison of different car fittings and database implementation cannot be performed in an easy and fast way. The effectiveness of virtual listening systems was therefore investigated in the context of a research project that involves both UNIPR and an important carmaker. A preliminary subjective evaluation session in real cars was carried out. Two different virtual listening systems were compared to investigate the best configuration for the intelligibility test. In this paper a comparison of the systems is presented and the provided experimental results show that the tests performed in the listening room are consistent with the ones carried out in car compartments.
Convention Paper 6356 (Purchase now)

©2005 Audio Engineering Society, Inc.