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Understanding Packet Delays in Audio Streaming

This tutorial explores the delays experienced by packetized audio transmissions. It begins with an example where the first packet arrives at the receiver at t=8. We analyze the delays for packets 2 through 8, identifying their respective delays as 7, 9, 8, 10, 9, 8, and 8 slots. The tutorial further investigates which packets will not arrive in time for audio playout beginning at t=8, 9, and 10, identifying packet losses. Finally, it concludes by calculating the minimum playout delay required to ensure that all packets arrive in time, determined to be 11 time units.

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Understanding Packet Delays in Audio Streaming

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  1. Multimedia Tutorial

  2. Consider the figure below. A sender begins sending packetized audio periodically at t =1.The first packet arrives at the receiver at t = 8.

  3. What are the delays (from sender to receiver, ignoring any playout delays) of packets 2 through 8? Note that each vertical and horizontal line segment in the figure has a length of 1, 2, or 3 time units. The delay of packet 2 is 7 slots. The delay of packet 3 is 9 slots. The delay of packet 4is 8 slots. The delay of packet 5 is 10 slots. The delay of packet 6 is 9 slots. The delay of packet 7 is 8 slots. The delay of packet 8 is 8 slots.

  4. b) If audio playout begins at t = 8, which of the first eight packets sent will not arrive in time for playout? • Packets 3, 4, 5, 6, 7, and 8 will not be received in time for their playout if playout begins at t = 8. c) If audio playout begins at t = 9, which of the first eight packets sent will not arrive in time for playout? • Packets 3, 5 and 6 will not be received in time for their playout if playout begins at t=9. Playout > packet delay Otherwise the packet will not arrive in time

  5. d) If audio playout begins at t = 10, which of the first eight packets sent will not arrive in time for playout? • Packet 5 will not be received in time for their playout if playout time begins at t = 10. e) What is the minimum playout delay at the receiver that results in all of the first eight packets arriving in time for their palyout? • The minimum playout delay at the receiver that results in all of the first eight packets arriving in time for their palyout is 11. The minimum playout delay = largest delay +1

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