NDLI: Analysis and Evaluation of the Skype and Google-Talk Voip Systems

Content Provider	IEEE Xplore Digital Library
Author	Sat, B. Wah, B.W.
Copyright Year	2006
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL (Sat, B.; Wah, B.W.)
Abstract	In this paper, we study Skype and Google Talk, two widely used VoIP systems, and compare their perceptual speech quality with that of our proposed system using UDP packet traces collected in the Planet Lab. Based on methods for speech coding, packetization, jitter control, estimation and feedback of network conditions, and loss concealments, our results show that Skype has noticeable quality degradations because it only uses a maximum of two-way redundancy for loss concealment, does not handle out-of-order arrivals, and applies a fixed jitter control of 60 ms relative to the expected arrival time. Its slow loss-adaptation time of more than one minute to change from one-way to two-way redundancy makes it susceptible to quality degradation under fast changing loss conditions. In contrast, Google Talk does not employ any loss adaptation and performs similar to Skype under low- to medium-loss scenarios. By addressing the shortcomings of Skype and Google Talk, we demonstrate improvements in speech quality in our proposed prototype
Starting Page	2153
Ending Page	2156
File Size	729887
Page Count	4
File Format	PDF
ISBN	1424403667
DOI	10.1109/ICME.2006.262681
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-07-09
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Speech analysis Speech coding Internet telephony Jitter Degradation Prototypes Speech codecs Feedback Out of order Costs
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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