Device sorts soft speech from background noise to end cell-phone shouting.
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References
Choi, S., Moon, W. & Lee, J. H. A new microphone system for near whispering. Journal of the Acoustical Society of America, 114, 801 - 812, (2003).
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Ball, P. New microphone detects whispers. Nature (2003). https://doi.org/10.1038/news030818-1
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DOI: https://doi.org/10.1038/news030818-1