dsp-final project
TRANSCRIPT
Overview
• Introduction to Flanging• Initial Design• Design of Filters• Design of Flanging in Simulink• GUI Features• Demonstration
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
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
DesignUsed 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
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
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
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
Special Feature- Mute Button• Mute button is activated by a switch• Activated in the GUI by a toggle button
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
References
• http://www.sengpielaudio.com/calculator-cutoffFrequencies.htm
• http://en.wikipedia.org/wiki/Flanging