1/19/2008
Copyright
2005 – Tim Hoerning
46
Flanger
•As was noticed previously, delay elements can create
notches in the frequency domain.
•By changing the delay time continuously (at a
sub-sampled value), the notches vary in
frequency
•The delay time is modulated with a low frequency
oscillator (LFO).
•The following parameters determine the sound from a
flanger
–Delay - The minimum amount of time the signal is
delayed. (100 ms to 10 ms).
–Sweep depth (width) - How wide the sweep is in terms of
delay time. i.e., the maximum additional delay time added as the LFO is swept (100 ns
to 10 ms)
–Speed – the frequency of the LFO
Input
Delay
+
Delay Mix
+
Feedback Gain - Regeneration
Filter
LFO
Output
Delay
Width