Table of Contents
Advertisement
NORD MODULAR G2 V1.4x
As you can see the curve is flat in the low register (which means it doesn't affect this part of the spectrum
at all) and then, at a certain point, gradually starts falling. When applied to the wave above, this filter cuts
away some of the high frequency material in the wave, like this:
Amplitude
F
ILTER TYPES
There are many types of filters, all with their different purposes. We will here discuss the three most
common ones.
L
OWPASS FILTER
The Lowpass filter dampens high frequencies and let's low frequencies pass through unaffected, as in the
example above. It is the most common synthesizer filter, since it can be used to "round off" the sharp
sound of sawtooth waves and pulse waves.
Amplitude
H
IGHPASS FILTER
This is the opposite of the lowpass filter. It let's the high frequencies of the sound pass through and cuts
off the low frequencies. This removes "bass" from a sound, without affecting the high end.
Amplitude
Amplitude
+
Frequency
Fc (Cutoff Frequency)
Fc (Cutoff Frequency)
=
Frequency
Frequency
Frequency
14. Synthesis basics: The filter
Page 271
Advertisement
Table of Contents
