This paper describes the design and implementation of a low cost portable speaker system with digital signal processing (DSP) enhanced performance. The cost of incorporating DSP into a low cost consumer audio product is typically prohibitive. Latest transducer developments in conjunction with recent advances in low cost audio digital signal processors have made it possible to consider a commercial board level implementation of a small portable speaker system with significant audio quality enhancement.
https://www.aes.org/e-lib/browse.cfm?elib=14211
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