2.1 Properties of signal and Noise (Properties of Physical Waveform) having significant nonzero values over a composite time interval that is finite Its spectrum having significant values over a composite frequency interval that Is fInite being a continuous function of time; having a finite peak value The waveform having only real values. That is, at any time, it cannot have a complex value a+bi where b is nonzero3 2.1 Properties of signal and Noise (Properties of Physical Waveform) • having significant nonzero values over a composite time interval that is finite; • Its spectrum having significant values over a composite frequency interval that is finite; • being a continuous function of time; • having a finite peak value; • The waveform having only real values. That is, at any time, it cannot have a complex value a+bj, where b is nonzero