Abstract:
In many fields of acoustic research real-time processing of audio signals is essential. Especially in situations where parameters of an algorithm have to be optimized by human subjects it is much more convenient to hear the effects of the modifications immediately than to compare precomputed results for a selected range of values. A real-time signal processing system can either be realized as a computer-based system or as a stand-alone unit. Both solutions have their specific assets and drawbacks. Several computer-based realizations are commercially available, but no universally configurable and programmable stand-alone system is known to the authors. One advantage of stand-alone systems is the fact that once configured for one special purpose they are usually easier to use for non-specialists. A substantial argument for an own hardware solution in form of a stand-alone unit results from the intensive research on digital signal processing for loudspeakers done in Aachen in recent years. New techniques like stacked AD converters required hardware features which are not available in commercial systems. So a new universal hardware had to be developed for research purpose and, in cooperation with an industrial partner, for the commercial application as a PA-controller