APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manual de usuario descargar pdf (Pagina 43)

4.3 The FX View 43

Figure 24: 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 25.

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.

0 dB

Amp

Frequency

Long Delay Time

0 dB

Amp

Frequency

Short Delay Time

Figure 25: Frequency response of a Flanger module. Effect of the length of the delay line.

The amount of effect is determined by the ratio of wet and dry signal mixed together as shown

in Figure 26. As the amount of wet signal sent to the output is increased, the amount of rejection

increases. Finally, the shape of the frequency response of the Flanger module is also inﬂuenced

by the amount of wet signal re-injected into the feedback loop as shown in Figure 27. Increasing

the feedback enhances frequency components least affected by the delay line and located at even

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manual de usuario Pagina 43