Filter introduction – Waldorf Largo User Manual
Page 74
Appendix
Largo User´s Manual
74
20
Polated
54
19/twenty
21
Transient
55
Wavetrip1
22
ElectricP
56
Wavetrip2
23
Robotic
57
Wavetrip3
24
StrongHrm
58
Wavetrip4
25
PercOrgan
59
MaleVoice
26
ClipSweep
60
Low Piano
27
ResoHarms
61
ResoSweep
28
2 Echoes
62
Xmas Bell
29
Formant2
63
FM Piano
30
FmntVocal
64
Fat Organ
31
MicroSync
65
Vibes
32
MicroPWM
66
Chorus 2
33
Glassy
67
True PWM
34
SquareHP
68
UpperWaves
Filter Introduction
Once the audio signal leaves the mixer, it is sent to the
filters. The Largo has two independent filter units, each
with its own individual settings. The signal flow in the
filters can be controlled via the Routing function. The
filters are components that have significant influence on
the Largo’s sound characteristics.
For a detailed description of the different filter types that
are available in the Largo, see the section “Filter Types”.
For now, we’ll explain the basic function of a filter
discussing the type used most commonly in synthesizers:
the low pass filter.
The low pass filter type dampens frequencies that lie
above a specified cutoff frequency. Frequencies below
this threshold are hardly affected. The frequency below
the cutoff point is called the pass band range, the
frequencies above are called the stop band range. The
Largo’s filter dampens frequencies in the stop band with a
certain slope. The slope can be 12dB or 24dB per octave.
This means that the level of a frequency that lies an
octave above the cutoff point will be 12dB or 24dB less
than those frequencies of the signal that fall into the pass
band. The following picture shows the basic principle of a
low pass filter: