ARM based Multimedia IP Phone
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The document discusses the development of an ARM-based multimedia IP telephone designed to implement VoIP technology for LAN communication. It outlines the project objectives, hardware components, firmware specifications, and the functionalities of the device such as networking protocols and user interface. Limitations include challenges in video communication and scheduling due to the absence of a separate operating system.
ARM based Multimedia IP Phone
- 1. ARM based Multimedia IP Phone THAPATHALI CAMPUS FINAL PRESENTATION MEMBERS Bijay Raj Paudel (Roll No: 067/BEX/105) Kshitij Poudel (Roll No: 067/BEX/119) Sagar Mali (Roll No: 067/BEX/133) Sujan Shrestha (Roll No: 067/BEX/140) SUPERVISOR Bikash Poudel
- 2. 1. INTRODUCTION IP based Telephone System IP Phone powered by ARM processor Implements VoIP technology UPS System for standalone operation 2
- 3. 2. OBJECTIVES To design and implement Multimedia capable IP Telephone using ARM processor To demonstrate the implementation of IP telephony system in LAN using developed ARM based IP phone as a client 3
- 4. 3. PROJECT OVERVIEW 4
- 5. 4. METHODOLOGY 4.1 Hardware 4.2.1 UPS System 4.2.2 Battery Status Display and Temperature Sensor 4.2.3 Main Phone Unit 4.2 Firmware 4.3.1 Networking Protocols 4.3.2 User Interface for ARM 4.3.3 IP Phone Firmware 4.3.4 Software for PC 4.3.5 Audio Codecs and Playback 5
- 6. 4.1 Hardware 4.2.1 UPS System 4.2.2 Battery Status Display Unit 4.2.3 Main Phone Unit (ARM Development Board) 6
- 7. 4.2.1 UPS System For the operation of IP phone during power outrage 7
- 8. 4.2.1 UPS System FEATURES Switches between main supply and battery Standard CCCV charging algorithm Overcharge Protection Deep Discharge Protection Regulated 5 V Supply 8
- 9. 4.2.2 Battery Status Display and Temperature Sensor Receives Voltage and Current level from battery Receives Temperature Status from LM35 Uses ATmega8 for ADC Transfers data via USART and RS232 interface 9
- 10. 4.2.2 Battery Status Display and Temperature Sensor Block Diagram 10 TEMP. 2 RS232 INTERFACE ATmega8 BATTERY LM35 VOLTAGE CURRENT TEMP. 1
- 11. 4.2.3 Main Phone Unit 11 Implemented on EM-LPC1788 development board based on the main chip LPC1788 produced by NXP Has ARM Cortex M3 microcontroller LPC1788
- 12. 4.2.3 Main Phone Unit 12
- 13. 4.2 Firmware 4.3.1 Network Protocols 4.3.2 User Interface for ARM 4.3.3 IP Phone Firmware 4.3.4 Software for PC 4.3.5 Audio Codecs and Playback 13
- 14. 4.3.1 Network Protocols TCP/IP (Transmission Control Protocol/ Internet Protocol) DHCP (Dynamic Host Control Protocol) ICMP (Internet Control Messaging Protocol) TCP/IP used instead of UDP for real time audio data 14
- 15. 15 lwIP Protocol Stack
- 16. 4.3.3 IP Phone Firmware 16 IP Packet Stack Defines a standardized packet format for delivering audio and video over IP networks Uses TCP for packet transfer Text and other Data Audio Codec RTCP Call Signaling Multimedia Control RTP Signaling TCP IP
- 17. 4.3.2 User Interface for ARM User friendly interface TFT LCD (480x272) and 4-wire touch Implemented using emWin Graphics Library 17
- 18. 4.3.4 SOFTWARE FOR PC To send, receive and monitor call from PC Server Addressing Client control Client Developed using C# language based on .NET framework User interface using Windows Presentation Foundation (WPF) Limited only to windows 18
- 19. 4.3.5 Audio Codecs and Playback Microphone Input Speaker Output ADC, DAC Sampling, coding, decoding UDA1380 one chip solution I2S data I2C control 23
- 20. 4.3.5 Audio Codecs and Playback 20 Recording Block Diagram
- 21. Control register Values 4.3.5 Audio Codecs and Playback 21 Playback Block Diagram Data Input Interface DSP features Interpolation Filter I2C Bus Interface Noise Shaper FSDAC Headphone Driver
- 22. THE SOFTWARE FLOW The one-way software flow on both sender and receiver Data Encode Audio encode RTP Stack Output device Audio decode Digital A/V signal in IP Packet Data Decode Signaling Stack Ethernet Digital A/V signal out Unpack IP Packet User interface User interface 24 Ambient and Battery Temperature, Battery level
- 23. 6. APPLICATIONS Private Network Communication System Education and Classroom Telemedicine and treatment 23
- 24. 7. LIMITATIONS Lack of separate video hardware so video communication was a big challenge and had to be abandoned Camera Decoder Encoder Clock Limitation Lack of Operating System was a problem for scheduling as everything had to be interrupt driven 24
- 25. 9. FUTURE ENHANCEMENT 25 Video communication Multi-platform based software Encryption for security purpose SMPS based power supply
- 26. REFERENCES Books Tanenbaum, A. S. & Wetherall, D. J. (2011). Computer Networks Viswanathan, T (2012). Telecommunication Switching Systems and NetworkS Haykin, S (2013). Digital Communication Systems. Sloss, A & Symes, D & Wright, C (2004). ARM System Developer's Guide. Websites Wikepedia. (2014). Voice over IP. Available: http://en.wikipedia.org/wiki/Voice_over_IP. Last accessed 20th Feb 2014. Valdes,R & Roos,D. (2014). How VoIP Works. Available: http://computer.howstuffworks.com/ip-telephony.htm. Last accessed 18th Feb 2014 Documents Sadasivan, S .(November 2010). Developing optimized signal processing software on the Cortex‐M4 processor. Retrieved February 10,2014, from http://www.arm.com/files/downloads/Developing_Advanced_Signal_Processing_Softwar e_on_the_Cortex-M4_Processor.pdf. Ward, M .(Number 4, 2005). Developing Video Phones with ARM Processor -based Solutions. Retrieved February 10, 2014, from http://www.iqmagazineonline.com/magazine/pdf/v_4_4_pdf/v_4_4_pg-16-19.pdf 26
- 27. THANK YOU!