Stuart T' Duerson II

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PROJECT
Stuart T. Duerson II James Holland
Asaf Cohen David Abnert
ECE 4006 Spring 2005 Dr. James
Hamblen
www.prism.gatech.edu/gt0914a/isis.html
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WHAT IS ISIS?

• ISIS Infrared Sound Interface System
• A keyboard instrument that uses infrared light
  beams instead of keys a touch-free keyboard.

WHAT ISIS DOES

• Sends modulated IR beams from 36 individual pads
  (keys).
• Detects reflected IR beams from users hand.
• Generates MIDI messages for use with a PC or
• any MIDI instrument.
• Teaches the user how to play using interactive
  lights.

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WHAT ISIS LOOKS LIKE

• 3 Folding
• Sections
• 12 Pads
• Per Section

• Circuitry nested inside pads.
• Controller housed in single section.

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WHAT IS ISIS MADE OF?
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WHAT IS ISIS MADE OF? ANALOG DOMAIN

• To mitigate the effects of ambient IR light, the
  emitted
• signals must be modulated.
• Emitted signals are pulse-width modulated to
  differentiate
• them from the ambient light.
• Received signals are amplified and bandpass
  filtered to
• produce a voltage corresponding to the level of
  reflection.
• Voltage is sent to A/D converter for processing.
  

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WHAT IS ISIS MADE OF? ANALOG DOMAIN
Typical IR Sensor Assembly
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WHAT IS ISIS MADE OF? DIGITAL DOMAIN

• Digital signals from sensors must be parsed into
• MIDI messages.
• MIDI Musical Instrument Digital Interface.
  Encodes
• information about how an electronic instrument is
  being
• played.
• MIDI messages will be sent via serial interface
  to a PC
• soundcard.
• Windows application will use messages to produce
  sound
• and teach user to play ISIS.

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WHAT IS ISIS MADE OF? DIGITAL DOMAIN

• PHASE I Use FPGA to process sensor output.

• PHASE II Use cheaper PIC microcontroller to
  process sensor
• output.

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PROJECT SCHEDULE
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COST ANALYSIS
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Thank You. Questions?