Graphic Equalizer & Spectrum VisualizerDavid Hospedales

Whilow Schock

Concept• Sound manipulation• Visual representation

Resulting Project• Analog and digital forms of audio processing

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

Graphic Equalizer

• Quality Factor of 1.414• 10 pass bands• Each band is an octave

apart

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

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

Implementation Challenges

• Circuit planning and layout difficulties• Incremental testing• Wire wrapping

Hardware

Software• Understanding and implementing FFTs• Attaining 10 updates per second

Layout and construction

ConclusionCons• 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

Thank YouThank you to all the instructors at NAIT for their support and knowledge.

Any questions?