11.3

Table Of Contents
SWEEPER MODULATION EFFECT513
The Phaser
The Phaser consists of a number of all-pass filters (1 to 40) with feedback, which can be used for creating really nice
phasing effects. An all-pass filter lets all frequencies of a signal through - but phase inverted 180 degrees. The prin-
ciple is to split the input signal in two, run one signal dry and the other through a series of all-pass filters, and then
sum the two signals. The picture below shows the basic principle of a phaser:
Frequency
Here you set the frequency of the all-pass filter(s) in the phaser.
Range: 37.6 Hz to 16.17 kHz
Frequency
(log)
Input signal
Allpass filters
Stage 1 Stage 2 Stage 3 Stage 40
Output signal
Amplitude 3-stage phaser
Frequency
+
Frequency
Bandwidth
Feedback
: audio signal
: control signal