Simplify the following text for a Grade 14 native English-speaking person.
Original: DSP includes subfields like : audio and speech signal processing , sonar and radar signal processing , sensor array processing , spectral estimation , statistical signal processing , digital image processing , signal processing for communications , control of systems , biomedical signal processing , seismic data processing , etc.
Simplified: DSP includes subfields like : communication signals processing , radar signal processing , sensor array processing , digital image processing , etc.