2. Overview
• Introduction to Flanging
• Initial Design
• Design of Filters
• Design of Flanging in Simulink
• GUI Features
• Demonstration
3. Flanging
• An audio effect, that creates a “whooshing”
sound known as the Darth Vader effect
• Adds a time-delayed copy of itself onto the
original signal
4. How is Flanging Created?
• When you mix two identical signals together
– Signal 1: unaltered audio signal
– Signal 2: signal delayed by a small period
• Creates peaks and notches in frequency
spectrum
• Signals get too close it sounds like “sucking
air”
• Larger the signal the more noticeable the
effect is
5. Initial Design
• Used fdatool to make biquad filter
– Exported to simulink
• Sound came out terrible
6. Design
Used the DSP System ToolBox to design
– One low pass filter
– 13 bandpass filters
– One highpass filter
– 16 gain blocks
• Bass
– First six filters
• Mid
– First four filters
• Tremble
– Last five filters
8. BandPass Filter Selection
• The 2/3 octave for 15 bands needs a Q value
of 2.14
• Formula used for the lower cutoff frequency
-Formula used for the lower cutoff frequency
-Designed to be IIR Chebyshev II
-Did not want ripples in the passband
9. Design- Flange
• Makes a copy of the signal
– The copy is then delayed
• Flange is activated by a switch
– That switch can be activated by a push button
11. Special Features- Song
Selection/Albums
• User can pick between four songs
• Songs are stored in a pop-up menu
• Only one song is used in the Simulink model
• Case statement used to play different songs
12. Special Feature- Mute Button
• Mute button is activated by a switch
• Activated in the GUI by a toggle button
13. Future Work
• Create a slider to vary the flanging on the song
• Faster Switching between songs
• Have more album artwork appear depending
on the song playing
• Have a suggestion box appear based off what
song is playing
• Having the song turn off when the user exits
the out of GUI
