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. [ ] digital signal processing and analog signal processing are subfields of signal processing. dsp applications include audio and speech processing , sonar , radar and other sensor array processing, spectral density estimation , statistical signal processing , digital image processing , data compression
, video coding , audio coding , image compression , signal processing for telecommunications , control systems , biomedical engineering , and seismology , among others. dsp can involve linear or nonlinear operations. nonlinear signal processing is closely related to nonlinear system identification [...
https://en.wikipedia.org/wiki/Digital_signal_processing