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Optical Audio System www.engr.uconn.edu/ece/SeniorDesign/Projects/ecesd35 ECE 290 Senior Design Fall 2003 – Spring 2004 Eric Flynn Joe Vargas Eric Irmscher Abstract

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optical audio system

Optical Audio System

www.engr.uconn.edu/ece/SeniorDesign/Projects/ecesd35

ECE 290

Senior Design

Fall 2003 – Spring 2004

Eric Flynn

Joe Vargas

Eric Irmscher

abstract
Abstract
  • Our group proposes to build a better audio system. We are going to build a higher quality, more efficient, lighter, and less interference-prone system.
  • We will accomplish this through:
    • digital transmission of the audio signal
    • fiber optic cables
    • discrete amplification
background on analog sound
Background on Analog sound
  • Typical Home / Car Audio System
    • CD player
    • Amplifier
    • Speakers
standard interconnects
Standard Interconnects
  • RCA cables
  • Speaker wire
benefits of digital sound
Benefits of Digital Sound
  • Precise
  • Higher quality
  • The new medium of information transfer
standard benefits of fiber optics
Standard Benefits of Fiber Optics
  • Will not pick up or transmit any electrical or radio interference
  • Lighter than equivalent copper wires or cables
  • Wider bandwidth for data transmission
design goals
Design Goals
  • Make the system as cost effective as possible
  • Make the system perform better than current methods
cd information
CD Information
  • CD encoded with pits (0 = pit, 1 = no pit)
  • Read by a laser reflecting from the CD surface
  • Reflected laser shines on a detector when a pit is not present
  • Digital output of a CD player is encoded
    • Code is very complex (Eight - to Fourteen Modulation)
    • Sorting
    • Complex error correction scheme (can recover from approximately a 1mm damaged section.... Each bit is approximately 3 microns)
    • Additional bits (location on CD, etc)
digital audio converter
Digital Audio Converter
  • Needed to decode the CD’s serial digital output to a two channel digital audio signal
cs8414
CS8414
  • It decodes the audio encryption used on Cds
  • It can sample up to 100kHz
  • Built in error checking
  • Small power consumption (5 volts, 10 mA)
  • Dedicated Audio Serial Port
  • Compatible with the CS4334 Digital to Analog converter
fiber optic cable
Many considerations

Type of fiber

Length

Loss associated with each type of fiber

Coupling / splicing

Pulse spreading

Detection

Type of source

Wavelength of source

Fiber Optic Cable
fibers basics
Fibers - Basics
  • Types:
    • glass / glass
      • Low loss
      • normally used for long distance transmission (>100km)
      • Very expensive ($50 / 10ft)
    • glass / plastic
      • More losses than glass / glass, but less expensive ($30 / 10ft)
      • Normally used for medium distance transmission (~100km)
    • plastic / plastic
      • Very lossy
      • Inexpensive ($7 / 10ft)
      • Used for short distance transmission (several km at the most)
sources and wavelengths
Sources and Wavelengths
  • Types of sources
    • LED
    • Laser diode
    • High power laser
  • Wavelengths available from 400nm to 1600nm
    • Visible light range from ~400nm - ~700nm
    • Difficult to work with invisible light
    • Losses associated with source wavelength
parts budget
Experimentation

CD player ~ $90

Speaker ~ $15

Fiber ~ $25

LED’s, emitters, detectors ~ $20

IC Chips ~ $20

Amp Kit ~ $10

Prototype

Parts dependent on results from experiment

Parts / Budget