1 / 13

Adaptive Playout Mechanisms for Packetized Audio Applications in Wide-Area Networks

Adaptive Playout Mechanisms for Packetized Audio Applications in Wide-Area Networks. Ramachandran Ramjee, Jim Kurose, Don Towsley Henning Schulzrinne INFOCOM '94. Networking for Global Communications., 13th Proceedings IEEE , 1994. Outline. Introduction Adaptive playout adjustment algorithms

carsyn
Download Presentation

Adaptive Playout Mechanisms for Packetized Audio Applications in Wide-Area Networks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Adaptive Playout Mechanisms for Packetized Audio Applications in Wide-Area Networks Ramachandran Ramjee, Jim Kurose, Don Towsley Henning Schulzrinne INFOCOM '94. Networking for Global Communications., 13th Proceedings IEEE , 1994 Chin-Kai Wu, CS, NTHU

  2. Outline • Introduction • Adaptive playout adjustment algorithms • Notations • Playout Mechanism • Algorithms • Experiment • Environment • Result Chin-Kai Wu, CS, NTHU

  3. Introduction Chin-Kai Wu, CS, NTHU

  4. Notations Chin-Kai Wu, CS, NTHU

  5. Notations (Cont’d) • ti: time packet i is generated at the sending host • ai: time packet i is received at the receiving host • pi: time packet i is played out at the receiving host • Dprop: propagation delay from sender to receiver • vi: the queueing delay • bi: time packet i spends in the buffer at the receiver • di: playout delay of packet i • ni: network delay of packet i Chin-Kai Wu, CS, NTHU

  6. Playout Mechanism • Absolute timing method if (packet i is the first packet of a talkspurt) pi = ti + ˆdi + 4 * ˆvi else pj = pi + tj – ti/* offset */ • ˆdi and ˆvi are estimates of the mean and variation in the end-to-end delay Chin-Kai Wu, CS, NTHU

  7. Playout Mechanism (Cont’d) Chin-Kai Wu, CS, NTHU

  8. Algorithms • Algorithm 1. • Algorithm 2. • Algorithm 3. Chin-Kai Wu, CS, NTHU

  9. Algorithms (Cont’d) • Algorithm 4. Chin-Kai Wu, CS, NTHU

  10. Experiment Environment • NeVoT (Network Voice Terminal) • Transmits 160 bytes every 20ms • Traces Chin-Kai Wu, CS, NTHU

  11. Experiment Result (Buffer Effect) Chin-Kai Wu, CS, NTHU

  12. Experiment Result(Effect of Duration of trace) Chin-Kai Wu, CS, NTHU

  13. Experiment Result(Effect of Jitter) Chin-Kai Wu, CS, NTHU

More Related