Fourier application to signal modulation and demodulation
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Fourier Application to Signal Modulation and Demodulation. 3.8 Kamen and Heck. 3.8.1 Amplitude Modulation. s(t) = Ax(t) cos(  c t) Acos(  c t)—carrier signal x(t) is the information signal Figure 3.31 Example 3.19—Figure 3.32

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3 8 1 amplitude modulation
3.8.1 Amplitude Modulation

  • s(t) = Ax(t) cos(ct)

    • Acos(ct)—carrier signal

    • x(t) is the information signal

    • Figure 3.31

  • Example 3.19—Figure 3.32

  • The Modulation Property can be used to determine the Fourier Transform of the signal—Figure 3.33.

  • S() = A/2 [X( + c) + X( - c)]


3 8 2 alternative form of am
3.8.2 Alternative Form of AM

  • s(t) = A[1 + k x(t)] cos(ct) (3.77)

  • k is a positive constant called the amplitude sensitivity.

  • 1 + k x(t) > 0 for all t

  • Example 3.20—Fig. 3.34.

  • S() = A [( + c) + ( - c)] + Ak/2 [X( + c) + X( - c)]

  • DSB-SC vs. DSB