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Unformatted text preview: Find the Fourier series representation of the corresponding output. 2. An information signal x ( t ) is modulated by cos 120 t. We denote the modulated signal by r ( t ), where r ( t ) = x ( t ) cos 120 t. Now we know that t t t t r 130 cos 2 120 cos 8 110 cos 2 ) ( + + = . a) Determine the Fourier transform of r ( t ). Sketch it as a function of . b) Determine the Fourier transform of x ( t ). Sketch it as a function of . c) Hence, or otherwise, determine x ( t )....
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- Spring '09