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Signals and Systems by Smarajit Ghosh

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3.1 FOURIER TRANSFORM

To study the behaviour of linear circuits there is another method known as Fourier transform. It is an operation that converts a function from time domain to frequency domain. From a given suitable function of time there is one and only one Fourier transform. Fourier transform has an important role in the study of different engineering problems including linear circuits. It is an integral transform. It is known that the line or discrete spectrum will be a continuous spectrum if T tends to infinity or image tends to zero resulting in a single or non-recurring pulse. If the function will be aperiodic, it cannot be analyzed by Fourier ...

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