“Magic Rainbow” Music Visualizer

The Colors of Sound GroupJamaal Merriweather

Justin McDevittWeston Bell

Robert A. Hicks II

Georgia Institute of TechnologyECE 4007/RP1 (em2)

Senior Design Project – Final PresentationMay 3, 2010

Project Overview

• What: LED music spectral intensity visualization system.

• Why: Enhance musical experience for the hearing impaired.

• Who: Individuals with hearing disabilities.

• Prototype Equipment Cost: $795.62. (add power supply)

$20.52

Design Objectives/GoalsDesign Objective Proposed Implementation Actual Implementation

Portability Weighs under 20 lbs and maximum enclosure size 20” x 20” x 6”

Weight <5 lbs, Enclosure size ~ 8” x 12” x 5”

Visual response to audio input

LED Zones indicate intensity/power levels through LED brightness or quantity of LEDs illuminated.

LED Zones indicate intensity/power levels through LED brightness.

Versatility USB compatible; 2GB (or greater) of system memory; Simulink and drivers installed

USB compatible; 2GB (or greater) of system memory; Simulink and drivers installed

Low Power Requirements

Maximum: 2 W (DAQ Digital Power Supply)Maximum: 25 W (External Power Supply)

Maximum: 2 W (DAQ Digital Power Supply)Maximum: 25 W (External Power Supply)Typical: 20 W (Total)

Overall Design Layout

Final Design in Chassis

Software Flow Diagram

Band Separator

Band Averager & Gain

PWM Conversion

Hardware Flow Diagram

LED Zone Circuit Schematic

Resistor Values and Duty Cycle

Demonstration Plan

• Zone Isolation: Playback of 8 .mp3 files containing a single frequency in the center of each zone’s bandwidth.

• Portability: Demonstrate compliance with weight and size specifications.

• Playback of .mp3 songs from various genres to illustrate appropriate response. (Classical, Rock, Techno, etc…)

• Demonstrate compatibility with microphone input.• Power Requirements: Measure power consumption of LED

zones (less than 25 W).

Problems & Issues

• Real Time vs. Simulation Time.• Post-FFT Sampling & Form Conversion Timing.• DAQ recognition in Simulink.• DAQ Power Supply Malfunction.• Brightness and low viewing angle of LEDs.• Optimal Circuit layout for Soldiered LED zones

(size constraint).

Equipment Costs

Product Description Quantity Unit Price Price

NI USB-6509 DAQ 1 $449.00 $449.00

CP-50LP Connector Block

1 $79.00 $79.00

R1005050 Ribbon Cable 1 $79.00 $79.00

DAQ Power Supply 1 $49.00 $49.00

Standard 5mm LEDs 250 $0.09 $22.50

Experimenter Board 2 $2.90 $5.80

A6276EA-T LED Driver 12 $2.69 $32.28

5V, 5A Power Supply 1 $20.52 $20.52

TOTAL COST $737.10

Future Work

• Use SPI with Simulink to indicate frequency band intensity through number of LEDs lit.

• Explore additional sensory outputs such as vibration.• Expand user friendliness by designing GUI.• Incorporate higher-level feature extraction (timbre,

mood, etc).• Adapt design for standalone use (for example, with

IPod) by performing signal processing on a microcontroller.

Any Questions??