International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
OFFLINE COMMUNIATION USING EMBEDDED LINUX Mars Esther1, Naadhiya Begum.A.R2, Sivakaami.P3, Sowmiya.B4, Mrs.Ramani.M5 Bachelor of Technology, Department of Electronics and Communication Engineering,[1],[2],[3],[4] Assistant Professor, Department of Electronics and Communication Engineering,[5] Sri Manakula Vinayagar Engineering College, Puducherry. ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Audio-visual communication in a real time contributes better communication to the users. Video conferencing may be a solution to saving both time and money because video conferencing may be a more effective way of communicating to clients and customers. Integrated Network Systems can support video conferencing that will allow you to share real time happenings and meet people face to face. In the last few years, research is being done for real time transmission of audio and video. This paper presents detailed study of audio, video and text transmission through various channels in real time. Most popular is using wireless LAN or Wi-Fi. Here Ethernet connection is used for forming a network. Existing systems cannot have video conferencing when offline. Videoconferencing is the way of a video streaming by a set of telecommunication technologies which will allow two or more locations to communicate by simultaneous two-way video and audio transmissions. Raspberry Pi 3 is used as main source for establishing video conferencing and text chatting for the users present in the same campus without the use of internet. The network can be extended if required. Since Raspberry Pi 3 supports wireless connections also, devices can also be connected through Wi-Fi. But here only a wired model is discussed. Key Words: Real time transmission, Raspberry pi 3, LAN, Wi-Fi 1. INTRODUCTION Communication which enables transfer of data between two terminals without the use of internet is called as Offline Communication. Here communication is done in a wired network. The network in offline communication interconnects computers within a limited area such as residence school, laboratory, office building, etc. It can connect only offers limited number of users. This offline communication network is extremely rivat and secure, since existence of the network itself is unknown to the people outside the network. Ethernet over twisted pair and Wi-Fi are the two most common transmission technologies used in offline communication. People in early times used LAN cabling which had various grades of coaxial cabling. Simple LAN consists of cabling and one or more switches. The software design of the Linux kernel is very well suited to embedded systems. It can be configured to provide only required functions, making it very suitable for devices with limited memory and storage resources. Operating systems Š 2017, IRJET
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Impact Factor value: 5.181
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that are based on the Linux kernel are used in various applications of embedded systems such as consumer electronics. The Raspberry Pi 3 microcontroller board is connected into a computer monitor, uses a standard keyboard and mouse. It is a capable device that enables people of all ages to explore computing, and to learn how to program in languages like Python. Graphical Processing Unit(GPU) is very important to make the video conferencing possible which is not available in any ordinary processors other than Raspberry Pi. It has RISC-based computer design approach, that is ARM based processors that needs significantly fewer transistors than typical processors. This approach reduces the costs, heat and power use. These are the suitable condition for light, portable battery-powered devices which are mobile phones, laptops, tablet and computers, and other embedded systems devices. An efficient multi-core CPU’s needs to be efficient and simpler in design. 2. RELATED WORKS Honghai Liu et al [1], has proposed an intelligent video systems (IVS) and Intelligent Video analytics (IVA) scheme in which a person will monitor between two video screens. It is video surveillance systems that can process manipulate and perform actions, automatically without human intervention. Intelligent video systems and services uses the hardware system integration, management, and video processing to provide service to the end users. IVS embeds computer vision technologies into video devices such as cameras, encoders, routers, digital video recorders (DVRs), network video recorders (NVRs), and other video management and storage devices IVS requires processing in either embedded cameras or central servers but embedded cameras have limited processing power, memory and bandwidth. Sathiya S et al [2], proposed a method for implementing image compression on raspberry pi board using JPEG compression algorithm in Python environment. JPEG compression algorithm is centered on the Direct Cosine Transform (DCT). DCT breaks the image into different frequencies and perform quantization in order to remove all redundant pixels and then encoded as the bit stream. After encoding, it is decoded and the reconstructed image is compressed which will have the file size less than that of original image without affecting its quality. Finally, JPEG compression algorithm is implemented on Raspberry Pi ISO 9001:2008 Certified Journal
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