APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Instrukcja Użytkownika Pobierz pdf (Strona 33)

4.2 The Edit View 33

Amplitude (dB)

Frequency (Hz)

0dB

−3dB

Center

Frequency

Q=10

Q=4

Q=2

Q=1

Band Width (Q=1)

Figure 16: Frequency response of the band-pass ﬁlter.

Amplitude (dB)

Frequency (Hz)

0dB

−3dB

Center

Frequency

Band Width (Q=1)

Q=1

Q=2

Q=4

Q=10

Figure 17: Frequency response of the notch ﬁlter.

Formant Filter

The formant ﬁlter reproduces the ﬁltering effect of the vocal tract in the human voice. By changing

the position of the tongue, the opening of the mouth and opening or closing the nasal cavities one

can change the ﬁlter applied to the glottal signal and thus produce the different vowels. Measure-

ments have shown that this ﬁlter can be modeled by three peaking EQ ﬁlters corresponding to the

three main cavities of the vocal tract as shown in Figure 18 and also known as formants. By mov-

ing the parameters of these three ﬁlters (frequency, amplitude and Q-factor) one can cycle between

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