![]() ![]() ![]() A signal may also be defined as any observable change in a quantity over space or time (a time series), even if it does not carry information. The IEEE Transactions on Signal Processing includes audio, video, speech, image, sonar, and radar as examples of signal. Any quantity that can vary over space or time can be used as a signal to share messages between observers. In signal processing, a signal is a function that conveys information about a phenomenon. In The Signal by William Powell Frith, a woman sends a signal by waving a white handkerchief. ![]()
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