Raza hassan
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This document discusses various applications of digital communication including military applications, video compression, speech processing, data compression, and digital signal processing. It provides details on each application area, describing how digital communication works in military contexts, the process of video compression, how speech and data are compressed, and what digital signal processing entails. The key advantages of digital communication mentioned are added security, ability to carry more information per second, maintaining quality over long distances, and preserving privacy through encryption.
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This document proposes a model to enhance VoIP security. It analyzes threats to VoIP like denial of service attacks targeting the Real-time Transport Protocol (RTP). The goal is to block these threats by fully encrypting RTP packets using Advanced Encryption Standard (AES). AES is chosen because it runs faster than other algorithms and is more secure with its 128, 192, or 256-bit keys. The proposed model would encrypt the RTP stream and authentication fields like synchronous source (SSRC) to prevent attacks and unauthorized access to voice calls while maintaining efficiency and availability of VoIP.
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Syllabus
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Chapter 2
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Chapter 3
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Chapter 5
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Chapter 6
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Raza hassan
- 2. 2
- 3. Over view: Military Application Video Compression Speech Processing Data Compression Digital Signal Processing Others 3
- 4. Communication Main purpose of communication is to transfer information from a source to a recipient via a channel or medium. Basic block diagram of a communication system: Source Transmitter Receiver Recipient Channel 4
- 5. Digital Communication & Why Digital communication is any message passed through digital devices. Any type of information that is passed digitally. Digital communication that is capable of very high speeds, suitable for transmission of images or voice or video as well as data. In digital communication, the transmission of information is done in digital form or in encoded form. Means, we encrypt the signal which gives us added security to our information signal being transmitted. The signal is sent from transmitter through a channel to the receiver. E.g Online Games E-Mails (Electronic mail) 5
- 6. 6 .The Digital Communication's main advantage is that it provides us added security to our information signal. .Digital signals carry more information per second than analogue signals. This is the same whether optical fibers, cables or radio waves are used. .Digital signals maintain their quality over long distances better than analogue signals. .Privacy is preserved by using data encryption .Generally, more bandwidth is required than that for analog systems. .High power consumption
- 7. Military : Military communications or military signals involve all aspects of communications, or conveyance of information, by armed forces. Military communications span from pre-history to the present. The earliest military communications were delivered by humans on foot. Later, communications progressed to visual and audible signals, and then advanced into the electronic age. Military communications equipment Drums, horns, flags, and riders on horseback were some of the early methods the military used to send messages over distances. In the middle 20th century radio equipment came to dominate the field. 7
- 8. A sovereign and indispensable system Connecting all the armed forces to maximize efficiency and operational superiority Provide autonomy to decide configure and control 8
- 9. Video compression is the process of reducing the quantity of data used to represent video images Compression is useful because it reduces resources required to store and transmit data. Video quality is reduced as the file is more compressed Compression is the practice of reducing the number of bits (0s or 1s) in a file. A video file typically can contain more than one type of compression: 2 types of video compression 1)Lossless compression 2)Lossy compression Hand break software 9Video Compression
- 10. 10
- 11. Data Compression Data compression is about storing and sending a smaller number of bits. Data compression is particularly useful in communications because it enables devices to transmit or store the same amount of data in fewer bits 11
- 12. Speech Processing Speech processing is the study of speech signals and the processing methods of these signals. The signals are usually processed in a digital representation, so speech processing can be regarded as a special case of digital signal processing, applied to speech signal. 12
- 13. Digital Signal Processing Digital signal processing (DSP) is the use of digital processing, such as by computers, to perform a wide variety of signal processing operations Converting a continuously changing waveform(analog) into a series of discrete levels(digital). 13
- 14. 14
- 15. Conclusion Our data become more secure ,smaller in size ,confidentiality, convenience, easy to send. 15
- 16. THANK YOU … 16