An analog or analogue 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 the pressure of the sound waves.
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Yes, I'm addicted to cassette tapes and have spent a lot of time thinking about them. But this isn't an issue, in fact it's ...