Chapter 7 Computer Networking A Top-Down Approach Multimedia Notworking KUROSE ROSS A note on the use of these ppt slides: Computer We're making these slides freely available to all (faculty,students,readers) They're in PowerPoint form so you see the animations;and can add,modify. Networking:A and delete slides (including this one)and slide content to suit your needs. They obviously represent a lot of work on our part.In return for use,we only Top Down ask the following: If you use these slides (e.g.,in a class)that you mention their source Approach (after all,we'd like people to use our book!) If you post any slides on a www site,that you note that they are adapted 6th edition from (or perhaps identical to)our slides,and note our copyright of this Jim Kurose,Keith Ross material. Addison-Wesley Thanks and enjoy!JFK/KWR March 2012 urhts Reserved Multmedia Networking 7-1
Chapter 7 Multimedia Networking Computer Networking: A Top Down Approach 6th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 A note on the use of these ppt slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: If you use these slides (e.g., in a class) that you mention their source (after all, we’d like people to use our book!) If you post any slides on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Multmedia Networking 7-1
Multimedia networking:outline 7.1 multimedia networking applications 7.2 streaming stored video 7.3 voice-over-IP 7.4 protocols for rea/-time conversational applications 7.5 network support for multimedia Multmedia Networking 7-2
Multimedia networking: outline 7.1 multimedia networking applications 7.2 streaming stored video 7.3 voice-over-IP 7.4 protocols for real-time conversational applications 7.5 network support for multimedia Multmedia Networking 7-2
Multimedia networking:outline 7.1 multimedia networking applications 7.2 streaming stored video 7.3 voice-over-IP 7.4 protocols for real-time conversational applications 7.5 network support for multimedia Multmedia Networking 7-3
Multimedia networking: outline 7.1 multimedia networking applications 7.2 streaming stored video 7.3 voice-over-IP 7.4 protocols for real-time conversational applications 7.5 network support for multimedia Multmedia Networking 7-3
Multimedia:audio analog audio signal sampled at constant rate quantization quantized error value of telephone:8,000 analog value samples/sec analog ·CD music:44,100 signal samples/sec apnldwe jeubIs olpne each sample quantized, i.e.,rounded time ·e.g,28=256 possible quantized values sampling rate (N sample/sec) each quantized value represented by bits,e.g.,8 bits for 256 values Multmedia Networking 7-4
Multimedia: audio Multmedia Networking 7-4 analog audio signal sampled at constant rate telephone: 8,000 samples/sec CD music: 44,100 samples/sec each sample quantized, i.e., rounded e.g., 2 8=256 possible quantized values each quantized value represented by bits, e.g., 8 bits for 256 values time audio signal amplitude analog signal quantized value of analog value quantization error sampling rate (N sample/sec)
Multimedia:audio example:8,000 samples/sec,256 quantized values:64,000 quantization quantized error value of bps analog value receiver converts bits back analog to analog signal: signal some quality reduction o!pne example rates time CD:1.411 Mbps sampling rate ÷MP3:96,128,160kbps (N sample/sec) Internet telephony:5.3 kbps and up Multmedia Networking 7-5
Multimedia: audio Multmedia Networking 7-5 example: 8,000 samples/sec, 256 quantized values: 64,000 bps receiver converts bits back to analog signal: some quality reduction example rates CD: 1.411 Mbps MP3: 96, 128, 160 kbps Internet telephony: 5.3 kbps and up time audio signal amplitude analog signal quantized value of analog value quantization error sampling rate (N sample/sec)