| American Heritage Dictionary of the English Language 3rd ed | |
|---|---|
| "hearing is most sensitive i | Signals and Systems for Speech and Hearing 2nd ed |
"For auditory signals and human listeners, the accepted range is 20Hz to 20kHz, the limits of human hearing"• , the least amount of intensity is needed to reach threshold in the 2000 to 5000 Hz range"• "Under very favorable conditions most individuals can obtain tonal characteristics as low as 12 cycles.
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