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PDR- Digital Audio Recorder/Player Brian Cowdrey Mike Ingoldby Gaurav Raje Jeff Swetnam Objective Successfully encode/decode MP3 Play/Stop a song Select track and fast forward/rewind Read off from Compact Flash Card Display song title and time Voice Recording in MP3 Format

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PDR- Digital Audio Recorder/Player


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pdr digital audio recorder player

PDR- Digital Audio Recorder/Player

Brian Cowdrey

Mike Ingoldby

Gaurav Raje

Jeff Swetnam

objective
Objective
  • Successfully encode/decode MP3
  • Play/Stop a song
  • Select track and fast forward/rewind
  • Read off from Compact Flash Card
  • Display song title and time
  • Voice Recording in MP3 Format
  • Equalizer Controls
hardware overview
Hardware Overview

ROM

RAM

MP3 Enc/Dec

DAC

MCU

Compact Flash

Compact Flash

D/E

Buttons

ADC

LCD

LEDs

software overview
Software Overview

Bios

DSP

OS

Recording

Recording

User Int.

Supply data to Dec/Enc

Supply CF to Memory

LCD

Buttons

Buttons

milestones
Milestones
  • CDR
    • Research/Design components
    • PCB design layout
    • Order First PCB
  • Milestone I
    • Test Microprocessor
    • Implement Monitor Program
    • LCD/User Interface
milestones contd
Milestones (contd.)
  • Milestone II
    • Program Encoder/Decoder
    • Program OS to Combine all programs
    • Redesign original PCB design
  • Expo
    • Possible extensions
    • Final testing/debugging
lcd display user interface
LCD Display/User Interface
  • Monochromatic graphical display 122x32 pixels
  • 8-bit interface with built in controller
  • Display song title and play time (possibly ID3 tag)
  • Show menu corresponding to user interface buttons
division of labor
Jeff

MP3 encoder/decoder

Signal processing

Brian

LCD

User interface

Mike

Microprocessor

USB interface

Gaurav

Compact flash

FAT16 file system

Division of Labor
risks contingency plan
Risks/Contingency Plan
  • Risk: Errors on PCB layout

Solution: Reorder new PCB board

  • Risk: MP3 Encoding/Decoding Errors

Solution: Record and play back raw data as

wav files

  • Risk: Problems with USB interface

Solution: Switch to a serial port

  • Risk: Graphical LCD errors

Solution: Switch to character LCD

compact flash card
Compact Flash Card
  • Small removable mass storage device
  • Connected to microprocessor with a 8 bit data bus
  • Microprocessor interfaces w/ CF card with registers on CF card
fat 16
FAT 16
  • Directory structure that lists files and locations on CF card
  • Compatible on many platforms (Windows, Linux, Mac OS)
  • User friendly
possible additions
Possible Additions
  • FM remote control
  • Equalizer
  • Battery Power
  • Real-time signal processing
marketability
Marketability
  • Target Market: Teenagers/College Students
  • Directly compete with Apple’s IPOD
    • Additional recording capabilities
impact on society
Impact on Society
  • May increase illegal music downloads
  • Drive down prices for other MP3 players in the market
cost analysis
Cost Analysis
  • PCB (2) $300
  • Microprocessor $40
  • MP3 Encoder/Decoder $35
  • LCD Display $30
  • Compact Flash Card $20
  • RAM $5
  • Miscellaneous Parts $20

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TOTAL APPROX. COST $450

expected yield
Expected Yield
  • Selling Price Per Unit = $50
  • Mass Produced

PCB $8

Microprocessor $1

MP3 encoder/decoder $1

Misc. parts $2

Labor $5

LCD $3

Total = $20

Profit=$30 per unit

150% yield