This paper will describe further research on a real-time convolution algorithm for long a FIR filter based on nonuniform bock partitioning. The static behaviour of the algorithm which solves the dilemma between the computational load and the latency of the processing operation is well examined in literature. New directions are investigated to exploit the inherent features of the algorithm and utilise them for audio applications. Especially a dynamic exchange of filter coefficients or subsets of them of a room impulse response is discussed and implemented. Unlike to traditional DSP solutions the prototype is realised in portable software objects and components that can be compiled on multi-propose processing units like off-the-shelf computers with standard audio facilities and different operating systems. Keywords : convolution, spatial sound processing, real-time, room acoustics, sonification

Download

This paper will describe the approach of modeling and sonifying the interaction with a pen on surfaces. The main acoustic parts and the dynamic behavior of the interaction are identified and a synthesis model is proposed to imitate the sound emanation during typical interactions on surfaces. Although a surface is twodimensional, modeling acoustical qualities of surfaces has to employ volumes to form resonances. Specific qualities of surfaces like the roughness and the texture are imitated by a noise generator which is controlled by the pen movement in real-time to achieve a maximum of acceptance of the sound effect. The effect will be used one hand to produce natural and coherent interaction on nearly silent electronic white boards or pen-tablets, i.e., reinventing of lost sound qualities. On the other hand modeling and sonifying pen strokes on surfaces allow to convey information about the properties of different areas or the current state of a windows of a computer display by using this sound feedback. Keywords : sound model, human-computer interaction, real-time, disappearing computer, audio feedback, sonification, mixed reality, multi-modal

Download

This paper proposes the sonification of the activity of a computer system that allows the user to monitor the basic performance parameters of the system, like CPU load, read and write activity of the hard disk or network traffic. Although, current computer systems still produce acoustic background noise, future and emerging computer systems will be more and more optimized with respect to their noise emission. In contrast to most of the concepts of auditory feedback, which present a particular sound as a feedback to a user’s command, the proposed feedback is mediated by the running computer system. The user’s interaction stimulates the system and hence the resulting feedback offers more realistic information about the current states of performance of the system. On the one hand the proposed sonification can mimic the acoustical behavior of operating components inside a computer system, while on the other hand, new qualities can be synthesized that enrich interaction with the device. Different forms of sound effects and generation for the proposed auditory feedback are realized to experiment with the usage in an environment of silent computer systems.

Download