The Good, the Bad and the Muffled: the Impact of Different Degradations on Internet Speech. Watson, A. & Sasse, M. A. ACM Multimedia 2000, 2000.
bibtex   
@article{ Sasse00,
  author = {A. Watson and M. A. Sasse},
  title = {The Good, the Bad and the Muffled: the Impact of Different Degradations on Internet Speech},
  journal = {ACM Multimedia 2000},
  year = {2000},
  pages = {269-276},
  annote = {Presents an experiment comparing the relative impact of different types of degradation on subjective quality ratings of interactive speech transmitted over packet-switched networks. The results from the experiment confirm that the effects of volume differences, echo and bad microphones are rated worse than the level of packet loss most users are likely to experience on the Internet today. Uses biometrics (heardrate, blood pressure) to determine the stress of test-subjects. The paper also includes a mapping of lay-man terms to the particular degradation type (the other end sounds "muffled", "fuzzy", "metallic", etc), which could be used to better aid end users in solving quality problems.},
  submitter = {Stefan Alfredsson},
  bibdate = {Tuesday, December 04, 2001 at 16:34:38 (CET)}
}

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