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340<br />

AM, FM, and Digital Modulated Systems Chap. 5<br />

|S(f)|<br />

<br />

1<br />

A 2 c<br />

1.0<br />

0<br />

f c<br />

f<br />

(a) ı = 0.2<br />

B T<br />

|S(f)|<br />

<br />

<br />

1<br />

A 2 c<br />

(b) ı=1.0<br />

|S(f)|<br />

<br />

<br />

1<br />

A 2 c<br />

|S(f)|<br />

<br />

<br />

1<br />

A 2 c<br />

|S(f)|<br />

<br />

<br />

1<br />

A 2 c<br />

0<br />

0<br />

(c) ı=2.0<br />

0<br />

(d) ı=5.0<br />

0<br />

(e) ı=8.0<br />

1.0<br />

1.0<br />

1.0<br />

1.0<br />

J o (1.0)<br />

J 1 (1.0)<br />

J 2 (1.0)<br />

f c<br />

f c +f m f c +2f m<br />

B T<br />

f c<br />

B T<br />

f c<br />

B T<br />

f c<br />

B T<br />

f<br />

f<br />

f<br />

f<br />

Figure 5–11 Magnitude spectra for FM or PM with sinusoidal modulation for various<br />

modulation indexes.

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