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PDR- Digital Audio Recorder/Player

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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  1. PDR- Digital Audio Recorder/Player Brian Cowdrey Mike Ingoldby Gaurav Raje Jeff Swetnam

  2. 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

  3. Hardware Overview ROM RAM MP3 Enc/Dec DAC MCU Compact Flash Compact Flash D/E Buttons ADC LCD LEDs

  4. Software Overview Bios DSP OS Recording Recording User Int. Supply data to Dec/Enc Supply CF to Memory LCD Buttons Buttons

  5. Microprocessor(C8051F320)

  6. MP3 Encoder/Decoder(MAS 3587F)

  7. Project Schedule

  8. Milestones • CDR • Research/Design components • PCB design layout • Order First PCB • Milestone I • Test Microprocessor • Implement Monitor Program • LCD/User Interface

  9. Milestones (contd.) • Milestone II • Program Encoder/Decoder • Program OS to Combine all programs • Redesign original PCB design • Expo • Possible extensions • Final testing/debugging

  10. 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

  11. Jeff MP3 encoder/decoder Signal processing Brian LCD User interface Mike Microprocessor USB interface Gaurav Compact flash FAT16 file system Division of Labor

  12. 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

  13. 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

  14. FAT 16 • Directory structure that lists files and locations on CF card • Compatible on many platforms (Windows, Linux, Mac OS) • User friendly

  15. Possible Additions • FM remote control • Equalizer • Battery Power • Real-time signal processing

  16. Marketability • Target Market: Teenagers/College Students • Directly compete with Apple’s IPOD • Additional recording capabilities

  17. Impact on Society • May increase illegal music downloads • Drive down prices for other MP3 players in the market

  18. Cost Analysis • PCB (2) $300 • Microprocessor $40 • MP3 Encoder/Decoder $35 • LCD Display $30 • Compact Flash Card $20 • RAM $5 • Miscellaneous Parts $20 ------------------------------------------------------------------------- TOTAL APPROX. COST $450

  19. 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

  20. Any Questions?

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