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The information of a signal is often accompanied by noise, which primarily refers to unwanted modifications of signals, but is often extended to include unwanted signals conflicting with desired signals ( crosstalk). Information theory serves as the formal study of signals and their content. Īnother important property of a signal is its entropy or information content. For example, a microphone converts an acoustic signal to a voltage waveform, and a speaker does the reverse. In human engineering, signals are typically provided by a sensor, and often the original form of a signal is converted to another form of energy using a transducer.

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Signaling theory, in evolutionary biology, proposes that a substantial driver for evolution is the ability for animals to communicate with each other by developing ways of signaling. Signaling occurs in all organisms even at cellular levels, with cell signaling. In nature, signals can be actions done by an organism to alert other organisms, ranging from the release of plant chemicals to warn nearby plants of a predator, to sounds or motions made by animals to alert other animals of food. A signal may also be defined as any observable change in a quantity over space or time, 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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