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47 lines
899 B
47 lines
899 B
The Klatt formant synthesizer
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DIGITAL RESONATOR
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OUTPUT
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INPUT SEQUENCE
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SEQUENCE
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r-- ---------------1
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[ S, meoao®amommmmmae wammo oo ol
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+— T
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20
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!
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N
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o 0O
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S BW
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=
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=
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20 TR Digtal
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-40
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0 1 2 3 4 5
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Frequency (kHz)
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Figure 12-5: Block diagram and frequency response of a digital resonator
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12.1.7 Digital antiresonator
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An antiresonance (also called an antiformant or transfer-function zero pair) can be
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realized by slight modifications to these equations. The frequency response of an
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antiresonator is the mirror image of the response plotted in Figure 12-5 (i.e. replace
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dB by -dB). An antiresonator is used in the synthesizer to shape the spectrum of
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the voicing source and another is used to simulate the effects of nasalization in the
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cascade model of the vocal tract transfer function.
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The output of an antiformant resonator, y (nT'), is related to the input x(nT') by
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the equation:
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