Echo performance of toll telephone connections in the united states

@article{Duffy1975EchoPO,
  title={Echo performance of toll telephone connections in the united states},
  author={F. P. Duffy and G. K. Mcnees and I. Nsell and T. W. Thatcher},
  journal={The Bell System Technical Journal},
  year={1975},
  volume={54},
  pages={209-243}
}
A field survey to characterize echo performance of toll telephone connections was conducted in 1972. Information on echo path loss and echo path delay for talker echoes was obtained from a sample of nearly 1700 connections in the continental United States. This paper discusses the survey data acquisition techniques, the sample design, and the statistical results. A major result of the survey was the determination that echo path delay is significantly less than previously estimated. For the… CONTINUE READING

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