1 / 3

# Fourier Application to Signal Modulation and Demodulation - PowerPoint PPT Presentation

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

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Fourier Application to Signal Modulation and Demodulation' - victoria-randolph

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Fourier Application to Signal Modulation and Demodulation

3.8

Kamen and Heck

• 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)]

• 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