The theory and application of filtering, coding, transmitting, estimating, detecting, analyzing, recognizing, synthesizing, recording, and reproducing signals by digital or analog devices or techniques. The term "signal" includes audio, video, speech, image, communication, geophysical, sonar, radar, medical, musical, and other signals.
Digital Audio Broadcasting - DAB
Analogue radio signals such as FM or MW have been subject to numerous kinds of interference on their way from the transmitter to your radio.
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Digital Signal Processing - DSP