An audio signal a(t) has a spectrum A(f) shown below. A(f) has a bandwidth W= 5 kHz. The signal a(t) is used to modulate a carrier cos(2pi f_0 t) at f_0 = 1 MH: to form a transmitted signal x(t) = a(t) middot cos(2 pi f_0 t). Sketch the spectrum of x(t), denoted by X (f). Give the numerical values on every important point on the frequency axis. Use MH: as the basic unit (5 kHz = 0.005 MH:)

21 1 - An audio signal a(t) has a spectrum A(f) shown below. A(f) has a bandwidth W= 5 kHz. The signal a(t) is used to modulate a carrier cos(2pi f_0 t) at f_0 = 1 MH: to form a transmitted signal x(t) = a(t) middot cos(2 pi f_0 t). Sketch the spectrum of x(t), denoted by X (f). Give the numerical values on every important point on the frequency axis. Use MH: as the basic unit (5 kHz = 0.005 MH:)

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images - An audio signal a(t) has a spectrum A(f) shown below. A(f) has a bandwidth W= 5 kHz. The signal a(t) is used to modulate a carrier cos(2pi f_0 t) at f_0 = 1 MH: to form a transmitted signal x(t) = a(t) middot cos(2 pi f_0 t). Sketch the spectrum of x(t), denoted by X (f). Give the numerical values on every important point on the frequency axis. Use MH: as the basic unit (5 kHz = 0.005 MH:)

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