1. Signal is a physical phenomenon that carries information
2. A function of one or more independent variables which contains some information is called a signal
3. A signal is formally defined as a function of one or more variables that conveys information on the nature of a physical phenomenon
2. A function of one or more independent variables which contains some information is called a signal
3. A signal is formally defined as a function of one or more variables that conveys information on the nature of a physical phenomenon
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