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Michelle Berger John Curtin Trey Griffin Aaron King Michael Nordfelt Jeffrey Whitted

PDACS. Michelle Berger John Curtin Trey Griffin Aaron King Michael Nordfelt Jeffrey Whitted. PDACS is. P ortable. D igital. A udio. C odec. S ystem. Overview.

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Michelle Berger John Curtin Trey Griffin Aaron King Michael Nordfelt Jeffrey Whitted

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  1. PDACS Michelle Berger John Curtin Trey Griffin Aaron King Michael Nordfelt Jeffrey Whitted

  2. PDACS is... Portable Digital Audio Codec System

  3. Overview PDACS will be a portable device designed for capturing, compressing, storing, playback, and retrieval of digital audio data. It will sample speech, perform real time compression, and store it in non-volatile memory. The data can then later be played back directly from the device or transferred to a PC by means of the serial port interface.

  4. Deliverables • Real-time compression of 8-bit 8KHz speech • Storage & retrieval of sound files • Real-time decompression of stored audio • Serial interface with PC for storage and archiving • GUI application that facilitates easy retrieval • Built in controls for recording, playback & deletion

  5. Features • Real Time Audio Compression/Decompression • Portability • Immediate Playback • Interface to Desktop PC • Device Display Panel • User-Friendly Display Interface • User-Friendly PC Interface

  6. Benefits • Convenience • No external media • Inexpensive to produce • Increased functionality • Designed for the typical user

  7. Component List • ADC0804 A/D Converter • AD7523 D/A Converter • AT45D161 Serial Flash Memory • National Semiconductor 16550DN UART • Maxim 232-CPE

  8. A/D Subsystem • Captures analog audio from microphone input • Audio sampled at 8-bit, 8 kHz • Converts analog to digital data • Outputs digital data to Xilinx chip

  9. D/A Subsystem • Receives decompressed digital data from compression subsystem • Converts digital data back into analog signal • Outputs the analog signal to either a built in speaker or a headphone jack

  10. Compression Subsystem • Real time compression/decompression of the incoming/outgoing digital data. • Considering several compression schemes: • Discrete Cosine Transform • Global System for Mobile Telecom • Sliding Window (Companding and LZSS) • Vector Encoding

  11. Memory Subsystem • 2 MB Serial Flash Memory • Non-volatile • Serial Interface • minimizes pin usage on Xilinix chip • simplifies interface to Xilinix chip • Low voltage keeps power requirements minimized

  12. Serial Interface Subsystem • Allows the device to interface with a PC • Uses RS-232 Interface • GUI application on the PC that allows for easy retrieval of recorded material • Application allows for the archiving of data

  13. Breakdown of Work • Michelle Berger - Compression & Memory systems • John Curtin - Compression & Memory systems • Trey Griffin - Memory & Serial Interface systems • Aaron King - A/D, D/A, and Compression systems • Michael Nordfelt - A/D, D/A and Serial Interface systems • Jeffrey Whitted - Memory and Serial Interface systems

  14. Schedule of Work • Weeks 1-3 • Proposal and Bi-weekly 1 • Memory Xilinx Module Implementation • A/D and D/A Xilinx Module Implementation • Compression Research • Weeks 4-6 • Serial Port Interface • Bi-weekly two

  15. Schedule of Work • Weeks 7-10 • Mid term presentation • NT serial port driver • Application development • Weeks 11-12 • Final System Integration • Testing • Final presentation and product delivery

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