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Last Updated: 20050816, mei

P6 - Signal Processing for Audio -1

Saturday, October 8, 9:30 am — 12:00 pm

Chair: Vicki Melchior, Audio Signal Processing Consultant - San Anselmo, CA, USA

P6-1 Toward a Procedure for Stability Analysis of High Order Sigma Delta ModulatorsJosh Reiss, Queen Mary, University of London - London, UK
One of the greatest unsolved problems in the theory of sigma delta modulation concerns the ability to analytically derive the stability, or boundedness, of a high order sigma delta modulator (SDM). In this paper we describe the existing literature and try to clarify the issues involved. We fully derive the stability of first order sigma delta modulators and derive some important results for the basic second order sigma delta modulator. For third order sigma delta modulators, we describe interesting simulated results as well as sketch a proof of instability, based on linear programming, for one particular SDM. Finally, we present two theoretical results concerning stability of general high order SDMs that point towards promising directions of future research.
Convention Paper 6549 (Purchase now)

P6-2 An Interface for Analysis-Driven Sound ProcessingNiels Bogaards, Axel Röbel, IRCAM - Paris, France
AudioSculpt is an application for the musical analysis and processing of sound files. The program unites a very detailed inspection of sound, both visually and auditorily, with high quality analysis-driven effects, such as time-stretch, transposition, and spectral filtering. Multiple algorithms provide automatic segmentation to guide the placement of sound treatments and steer processing parameters. By designing transformations directly on the sonogram, very precise spectral modifications can be made, allowing both intuitive sound design as well as sound restoration and source separation.
Convention Paper 6550 (Purchase now)

P6-3 A Comparison of Digital Power Amplifiers with Conventional Linear Technology: Performance, Function, and ApplicationCraig Bell, Isaac Sibson, Zetex Semiconductors plc - Oldham, Lancashire, UK
Drawing conclusions about the actual subjective performance of an amplifier from the results of standard tests can be difficult. The measured results for the harmonic distortion and intermodulation distortion in the case of the linear amplifier are excellent and exceed those of the digital amplifier. However, a subjective assessment with music material ranked the digital amplifier performance as superior. More investigation was required.
Convention Paper 6551 (Purchase now)

P6-4 Selective Mixing of SoundsPiotr Kleczkowski, AGH University of Science and Technology - Krakow, Poland
An interesting psychoacoustic phenomenon has been found: the removal of large parts of musical tracks in the time-frequency domain may not be perceived in the mix at all, whereas some details of the sounds are heard enhanced in the mix. The phenomenon is described and investigations into the possibility of its practical use are presented. It is shown how the details of implementation and particular parameters affect the attributes of the sound. The differences in the sound of a standard mix and the sound of the mix based on this phenomenon are summarized.
Convention Paper 6552 (Purchase now)

P6-5 An Efficient Asynchronous Sampling-Rate Conversion Algorithm for Multichannel Audio ApplicationsPaul Beckmann, Timothy Stilson, Analog Devices - San Jose, CA, USA
We describe an asynchronous sampling-rate conversion (SRC) algorithm that is specifically tailored to multichannel audio applications. The algorithm is capable of converting between arbitrary asynchronous sampling rates around a fixed operating point and is designed to operate in multithreaded systems. The algorithm uses a set of fractional delay filters together with cubic interpolation to achieve accurate and efficient sampling-rate conversion.
Convention Paper 6553 (Purchase now)

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