PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

Spectrogram of the speech file mtlb

1

0.8

0.6

0.4

0.2

0

0

Frequency

500 1000 1500

Time

Specgram of sinusoid + noise

1

0.8

0.6

0.4

0.2

0

Frequency

0 500 1000 1500

Time

Power spec. den. of mtlb

Frequency

Power spec. den. of sinus. + noise

20

− 20

− 40

− 60

0

Power spectrum magnitude (dB) (^0) 0.5 1
30
20
10
0
(^0) 0.5 1
− 10
Frequency
Power spectrum magnitude (dB)
COLOR FIGURE 4.21
Plots of parts 5, 6, 7, and 8 of R.4.125.
0.8
0.6
0.4
0.2
0
−0.2
−0.4
−0.6
−0.8
(^0) 0.5 1 1.5 (^2) 2.5 3 3.5 4
time (sec)
fundamental frequency
harmonic frequencies
Amplitude
Harmonic components of the square wave
COLOR FIGURE 4.29
Plots of part b of Example 4.1.
CRC_47760_COLPLA.indd 4CRC_47760_COLPLA.indd 4 7/18/2008 5:34:23 PM7/18/2008 5:34:23 PM