Any signal whose amplitude is a function of time has a corresponding frequency spectrum . When the signals are viewed in the form of a frequency spectrum, certain aspects of the signals or the underlying processes producing them are revealed.
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The shape of the amplitude spectrum is determined by the function sin( f ) f π τ π τ . the single rectangular pulse of width τ contains all frequencies between 0 and ∞. the relative amplitudes (ignoring the overall amplitude factor) of these frequencies is given by the function sin( f ) f π τ π τ .
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