Digital Signal Processing Reference
In-Depth Information
10
4
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×
(a)
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0
0.5
1
1.5
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Time (sec)
(b)
(c)
(d)
(e)
(f)
(g)
200
(h)
100
0
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Time (sec)
Figure 6.13
Comparison of pitch contours of PDAs for (a) male speech (b) Refer-
ence; (c) TA, (d) WTA, (e) STA, (f) SS, (g) WSS, and (h) SS-SA-based PDAs
zero of the inverse filter may be adjusted to become the first harmonic,
and the second complex zero to the second harmonic. This may destroy
the entire periodicity information in the residual signals [16, 1]. Thus, a
formant weighting filter [24] is adopted as a preprocessor to control the de-
emphasizing factor of the formants while keeping the harmonics structure.
As described in the equation below, it is, effectively, a process of obtaining the
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