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Table Of Contents
250 Chapter 22 ES2
Band Rejection
In this image, the second partial is rejected. The basic oscillation and all other
harmonics are present. Sawtooth is still the input waveform.
Bandpass Filter
The bandpass filter distorts the picture of the sawtooth wave.
Filter 2 FM
The cutoff frequency of Filter 2 can be modulated by the sine wave of Oscillator 1,
which means that it can be modulated in the audio frequency range.
The effect of such filter modulations in the audio spectrum is unpredictable, but the
results tend to remain harmonic as long as the modulation intensity doesnt get too
high. FM defines the intensity of frequency modulation. This parameter can be
modulated in real-time: In the Router, this modulation is abbreviated as LPF FM.
A clean sine wave, at the frequency of Oscillator 1, is always used as the modulation
source.
Note: Don’t confuse this type of filter frequency modulation with the FM feature of
Oscillator 1, which can be modulated by Oscillator 2, as described in the “Linear
Frequency Modulation” section, on page 234.
Note: If a frequency modulation of Oscillator 1 by Oscillator 2 is used, it does not
influence the (sine wave) signal used to modulate the cutoff frequencies.