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Reconfigurable Logic for Audio Signal Processing

As audio applications become more complex, it is increasingly difficult to support the required signal processing functions using traditional DSP microprocessors due to their limited processing capability in terms of arithmetic capacity, datapath precision and input-output (I/O) bandwidth limitations. An alternative approach based on Field Programmable Gate Array (FPGA) technology is proposed, which not only preserves the versatility and flexibility of DSP microprocessors but provides the advantages of a customizable datapath which include high degrees of computational and data parallelism, arbitrary precision arithmetic and enormous I/O capacity. This paper presents a case study in which reconfigurable logic technology is employed for implementing infinite impulse response (IIR) filter banks. The study's results show that thousands of second-order filters can be implemented on a single FPGA and demonstrate the potential of reconfigurable logic technology for audio signal processing.

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