APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Instrukcja Użytkownika Pobierz pdf (Strona 43)

4.3 The FX View 43

channel. Finally, the Mix knob allows one to mix the dry and wet signals. In its leftmost position,

there is no output signal from the chorus and one only ears the dry input signals. In its rightmost

position, one only ears the wet signal from the chorus module. In its center position, there is an

equal amount of dry and wet signal in the output signal from the module.

Note that Ultra Analog VA includes a second chorus algorithm called vintage chorus which

sounds differently and has been kept for preset compatibility reasons.

4.3.6 Flanger

The Flanger module implements the effect known as ﬂanging which colors the sound with a false

pitch effect caused by the addition of a signal of varying delay to the original signal.

The algorithm implemented in this module is shown in Figure 22. The input signal is sent into

a variable delay line. The output of this delay is then mixed with the dry signal and re-injected into

the delay line with a feedback coefﬁcient.

Figure 22: Flanger algorithm.

The effect of the Flanger module is to introduce rejection in the spectrum of the input signal at

frequencies located at odd harmonic intervals of a fundamental frequency as shown in Figure 23.

The location of the fundamental frequency f 0 and the spacing between the valleys and peaks of

the frequency response is determined by the length of the delay line (f 0 = 1/(2delay)), the longer

the delay, the lower is f 0 and the smaller the spacing between the harmonics while decreasing the

delay increases f 0 and hence the distance between the harmonics.

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