Embed Size (px)
DESCRIPTION
ARM based Multimedia IP Phone is a telephone with ARM processor, capable of sending and receiving real time data signals over the existing data network. It uses LPC1788 microcontroller to implement the standard data communication protocols using lwIP - open source library and modern touch based user interface using emWin Graphics library. The project also features a battery powered Uninterruptible Power System (UPS) for increased portability and standalone ability. Further, to demonstrate the use of IP telephony and VoIP, client server based computer applications are also developed.
Citation preview
ARM based
Multimedia IP Phone
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
THAPATHALI CAMPUS
FINAL PRESENTATION
1. INTRODUCTION
IP based Telephone System
IP Phone powered by ARM processor
Implements VoIP technology
UPS System for standalone operation
2
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
3. PROJECT OVERVIEW
4
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
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
4.2.1 UPS System
For the operation of IP phone during power outrage
7
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
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
Block Diagram
10
TEMP. 2
RS232
INTERFACEATmega8
BATTERY
LM35
VOLTAGE
CURRENT
TEMP. 1
4.2.2 Battery Status Display and
Temperature Sensor
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
4.2.3 Main Phone Unit
12
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
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
lwIP Protocol Stack
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
4.3.2 User Interface for ARM
User friendly interface
TFT LCD (480x272) and
4-wire touch
Implemented using emWin Graphics Library
17
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
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
4.3.5 Audio Codecs and Playback
20
Recording Block Diagram
Control register Values
4.3.5 Audio Codecs and Playback
21
Playback Block Diagram
Data Input
InterfaceDSP features
Interpolation
Filter
Noise
Shaper
Headphone Driver
I2C Bus Interface
FSDAC
THE SOFTWARE FLOW
The one-way software flow on both sender and
receiver
Data Encode Audio encode
RTP Stack
Audio decode
Digital A/V signal in
IP Packet
Data Decode
Signaling Stack
Ethernet
Digital A/V signal out
IP Packet
Unpack
Output device
User
interfaceUser
interface
24
Ambient and
Battery
Temperature,
Battery level
6. APPLICATIONS
Private Network Communication System
Education and Classroom
Telemedicine and treatment
23
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
9. FUTURE ENHANCEMENT
25
Video communication
Multi-platform based software
Encryption for security purpose
SMPS based power supply
REFERENCESBooks
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_Software_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
THANK YOU!
