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DSP stands for Digital Signal Processing or Digital Signal Processor.

DSP stands for Digital Signal Processing. DSP relies heavily on discrete time mathematics.

DSP can be implemented on general purpose microcontrollers or special Digital Signal Processors (also called DSPs), which have instructions for often used functions like MACs (Multiply-and-ACcumulate) or bit reversal.

For software-related DSP questions, consider the DSP Stack Exchange.