There are several methods to transform a time-domain signal into frequency-domain. The motivation for transforming a signal from one domain to another is that the characteristics of a signal are visible directly and can be easily extracted from such a representation. For instance, from a signal represented in time-domain, we can only extract some features such as the exact starting time instant of the signal or the duration for which the signal existed. However, other useful features such as bandwidth and frequency occupied by the signal are not directly visible unless we convert it into the frequency-domain. Another advantage of transforming a signal into the Fourier domain is ...
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