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APLODSP, Design of Customizable Audio Processors for Loudspeaker System Compensation by DSP

This paper summarizes the results of the ESPRIT project APLODSP. The goal of this application experiment has been to develop adequate models for the simulation of the nonlinear behavior of loudspeakers and to design a dedicated audio processor to reduce sound distortion. This involves the definition of a systematic design flow for antidistortion audio processors and the effective exploitation of CAD tools for the automatic implementation of the defined algorithms. The audio processor was implemented with a DSP using state-of-the-art tools for simulation, validation, and synthesis. DSP is the emerging low-cost technology for audio processing and, in particular, for car audio systems. In fact, car manufacturers are planning to reduce the cables inside the car and to use a single cable to distribute the main signals multiplexed all around the vehicle. This transition to digital audio signal transmission will foster the use of active loudspeakers equipped with dedicated digital audio processors. The audio processor, designed and tested within this ESPRIT project, can be seen as a first step in this direction. It shows how the loudspeaker distortion can be reduced by digital signal processing, and it exploits the versatility of digital designs in order to allow hardware re-use for different car models. It also allows a very fast redesign to fit many different purposes. A semiautomatic design flow for the design of antidistortion audio processors is available, which synthesizes a dedicated audio processor for each loudspeaker model, once suitable loudspeaker parameters have been specified.:

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