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Audio Frequency Response

October 18th Fact-of-the-Day

Many years ago broadcast engineers determined in exhaustive experimental tests with juries of listeners that if the range of audio frequencies passed by a transmission system must be restricted, it is important to restrict both the upper and lower frequencies such that approximately equal degradation occurs at both ends of the spectrum. They determined that the geometric mean of the upper and lower frequencies that can be heard by an average listener is roughly 800Hz and that to sound good a transmission system should pass as many octaves above that frequency as it passes below. Transmitting more octaves below than above results in complaints that sound is 'drummy,' 'heavy,' or 'thick.' Transmitting more octaves above than below results in complaints that sound is 'tinny' or 'thin.' ©2004 Martek, International. All rights reserved.

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