Doepfer A-121 12dB Multimode VCF Manual de usuario descargar pdf (Pagina 3)

doepfer

System A - 100

VCF 2

A-121

3. Basics

Low Pass

The most common type of filter in analogue sound

production is the low-pass, which filters out the higher

parts of the sound spectrum, and lets the lower fre-

quencies pass unchanged. Cut-off frequency f

de-

termines the frequency at which this occurs (see Fig.

1).

Fig. 1: Typical response curves of the four filters.

High Pass

The high-pass filter is a precise mirror-image of the

low-pass filter: while it lets frequencies that are higher

than the cut-off frequency f

through, it attenuates

frequencies below the cut-off point (see Fig. 1).

Band Pass

In a band-pass filter, both ends of the frequency

spectrum are attenuated (see Fig. 1), and the cut-off

frequency f

becomes the mid frequency. It gives

you the ability to highlight a particular frequency band.

Notch

A notch filter is the opposite of a band-pass filter,

letting through the upper and lower end of the fre-

quency spectrum, but rejecting a band in the middle

(see Fig. 1). If the mid-frequency f

is modulated by an

LFO, the result sounds very similar to phasing.

Out

Freq.

Out

Freq.

Low Pass

High Pass

Freq. Freq.

Out

Band Pass Notch

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Doepfer A-121 12dB Multimode VCF Manual de usuario Pagina 3