1. ~ Audio Communication on a Wireless Network ~ Mike Pascucci Advisor: Professor Spinelli 10/5/04

2. - Purpose - Overall Goal - Functional Diagram - Functional Requirements - Schedule - Conclusion - Questions

3. Portable Voice-over-IP * Two-way audio communication between …………microcontrollers & wireless ethernet * VoIP exists as free telephone alternative - Advantages: ~ Free ~ Computer-to-Computer and ………………. …..Computer-to-Phone - Disadvantage: ~ Systems using VoIP not portable

4. Serial-to-WiFi Ethernet By ACKSYS Mic to ADC Headphone to DAC 8051 (F020) Cygnal Microcontroller

5. Analog voice to Digital Digital Data to Serial Port as IP Packets Serial to Wireless To Internet Digital to Analog voice IP Packets from Serial Port to Digital Data Wireless to Serial From Internet …

6. Serial-to-Wireless sends connection request (to IP designated in code) Connection Accepted Voice into mic, to ADC, to serial, to IP (as packets) Acknowledge Digital Data to DAC, … … … … … … … … … … to speaker output Close Connection Connection Closed ServerClient

7. - Telephone Quality Audio ……~ ADC and DAC sample > 8000 bits/sec (8 Kbs) ………with 8 bits/sample - Propagation Delay: 150-200 ms - Ability to connect to another device - Ability to disconnect from that device - Transmit IP Packets with high fidelity

8. One 8051 Microcontroller One Headphone / Microphone combo Mic to ADC Headphone to DAC

9. Serial-to-Serial Cable

10. Dedicated Serial-to-Wireless Devices

11. Proof of Concept for Portable VoIP - Note: Though portable, not necessarily ………..compact – could be made so in the future Basic Tentative Schedule: - Stage 0 by Wednesday, November 3 - Stage 1 by Monday, December 6 - Stage 2 by Monday, January 17 - Overall Goal by Monday, February 14

12. Image of 8051F020 target board credit: http://www.silabs.com/products/pdf/C8051F02x-DKrev0_4.pdf Image of Headphone/Microphone credit: http://us.st7.yimg.com/store1.yimg.com/I/directron_1812_79736366 Image of Serial-to-WiFi Ethernet credit: http://www.acksys.fr/us/produits/wl_dongle_oem.htm References Tackling Delay in Today’s Global Voice Networks http://www.tmcnet.com/it/0704/Fpmcsierra.htm