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49 lines
1.1 KiB
49 lines
1.1 KiB
The Klatt formant synthesizer
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60
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50 s,
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H
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o
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\~
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-
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-~
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-~
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-
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- -
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-----
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hadl X,
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N
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o
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Magnitude spectrum (dB)
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W
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o
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10
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0 1 2 3 4 5
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Frequency (kHz)
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Figure 12-8: Waveform segment and magnitude spectrum of frication noise
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generate both frication and aspiration noise. However, in the cascade synthesizer
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configuration, aspiration noise is sent through the cascade vocal tract model (since
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the cascade configuration is specially designed to model vocal tract characteristics
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for laryngeal sound s'(')im:'es'), while fricatives require a parallel vocal tract con-
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figuration. Therefore separate amplitude controls are needed for frication and
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aspiration in a cascade/parallel configuration. The amplitude of aspiration noise
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sent to the cascade vocal tract model is determined by AH, which is given in dB.
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A value of 60 will generate strong aspiration, while a value of zero effectively
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turns off the aspiration source. Since frication and aspiration are generated by an
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identical process in the synthesizer, Figure 12-8 describes the characteristics of the
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aspiration source as well.
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137
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