7

Table Of Contents
Chapter 22 ES2 249
Lowpass Filter
Lowpass-filtered sawtooth wave, Cutoff Frequency one octave above the frequency of
the sawtooth. As the slope isn’t infinite, harmonics are still visible. Note that the
waveform is rounded.
Highpass Filter
Highpass-filtered sawtooth wave, Cutoff Frequency one octave above the frequency of
the sawtooth. The basic harmonic is rejected by about 12 dB, as the slope is 12 dB/
octave. Try to mentally add a sine curve with the basic wavelength to the graphic: The
sum of both would result in a sawtooth wave.
Peak Type Filter
The second partial is not easy to see, even though all other partials are rejected.
Peak Type Filter with Resonance
Here, the second partial is strongly emphasized.