For satiable communication, the average speech level should exceed that of an interfering noise by 6dB; lower sound:noise ratios are rarely acceptable (Moore, 1997). Manifesting in a wide frequency range, speech is quite resistant to many types of masking frequency cut-off—Moore reports, for example, that a band of frequencies from 1000 Hz to 2000 Hz is sufficient (sentence articulation score of about 90%).
|Quantity to be measured||Unit of measurement||Good values|
|STI||Intelligibility (international known)||> 0.6|
|CIS||Intelligibility (international known)||> 0.78|
|%Alcons||Articulation loss (popular in USA)||< 10%|
|C50||Clarity index (widespread in Germany)||> 3 dB|
|RASTI (obsolete)||Intelligibility (international known)||> 0.6|
Word articulation remains high even when only 1–2% of the wave is unaffected by distortion:
Read more about this topic: Intelligibility (communication)
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Famous quotes containing the words levels and/or noise:
“The only inequalities that matter begin in the mind. It is not income levels but differences in mental equipment that keep people apart, breed feelings of inferiority.”
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