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signal is any continuous signal for which the time-varying feature (variable) of the signal is a representation of some other time-varying quantity, i.e., analogous to another time-varying signal. for example, in an analog audio signal , the instantaneous voltage of the signal varies continuously with
conveyed by an analog signal; often[ specify ] such a signal is a measured response to changes in physical phenomena, such as sound , light , temperature , position, or pressure . the physical variable is converted to an analog signal by a transducer . for example, sound striking the diaphragm of a microphone...
https://en.wikipedia.org/wiki/Analog_signal