1. GraphicEqualizer&
SpectrumVisualizer
David Hospedales
Whilow Schock

2. Concept
• Sound manipulation
• Visual representation
Resulting Project
• Analog and digital forms of audio processing

3. Project Components
• Graphic Equalizer
• Digital Signal Processing
• LED Display

4. Graphic Equalizer
• Quality Factor of 1.414
• 10 pass bands
• Each band is an octave
apart

6. Digital Signal Processing
• Audio sampling
• Conversion from time to frequency domain
• Communication protocol to LED display

7. LED Display
• Continuous illumination
• Designing around amperage
• 74HC595 shift registers

9. Implementation Challenges
• Circuit planning and layout difficulties
• Incremental testing
• Wire wrapping
Hardware
Software
• Understanding and implementing FFTs
• Attaining 10 updates per second

10. Layout and construction

12. Conclusion
Cons
• Destruction of stereo
• Requires multiple power sources
• PCB a better option
Pros
• Processes audio in analog and digital forms
• All components work as designed
• Excellent learning experience

14. ThankYou
Thank you to all the instructors at NAIT for their support
and knowledge.
Any questions?