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A DSP-Based Audio Signal Processor

The ASP consists of several components: a digital beat-frequency oscillator (BFO), selectable band-pass filters for CW, SSB and other digital modes, a denoiser based on the least-mean-squares (LMS) technique and a Wiener-filter autonotcher (removing carriers or heterodynes). Several advanced concepts are applied in this project, such as multirate processing, adaptive filtering and frequency shifting. These all are of fundamental importance to anyone wishing to learn more about the finer points of DSP. These principles may be considered the “tools of the trade” for working with DSP. This not only applies to audio signal processing, but also is becoming evident in contemporary digital radios.