Real-time audio/music processing of even moderate complexity needs multiple digital signal processors. Synchronous multiprocessing is required for hardware efficiency; yet efficient development of high-level multiprocessing software needs asynchronous DSPs. While processing, DSPs exchange samples with A/D/A converters and disk drives, update programs and parameters, and communicate parameters, state, and samples with other DSPs. Shared and/or private memory, bus structure, arbitration, real-time operating systems, and cost tradeoffs between architectures are discussed.
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