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Effects of heat and humidity on sound
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<blockquote data-quote="Art Welter" data-source="post: 207161" data-attributes="member: 52"><p>Tim,</p><p></p><p>The meteorology probe was only used to "plug in" the difference in speed of sound which varies slightly with temperature and humidity, which determines how many ms delay are needed for time of flight, really only of concern for long delay lines- it was not used for HF air absorption automatic compensation.</p><p></p><p>Changing delay times has no failure mode - boosting HF from 3 to 20+ dB to compensate for differing heat vs humidity can easily result in cooked drivers or overly compressed distorted "sizzle", and an automatic HF compensation device would require separate algorithms for each portion of the system that covers a different distance.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 207161, member: 52"] Tim, The meteorology probe was only used to "plug in" the difference in speed of sound which varies slightly with temperature and humidity, which determines how many ms delay are needed for time of flight, really only of concern for long delay lines- it was not used for HF air absorption automatic compensation. Changing delay times has no failure mode - boosting HF from 3 to 20+ dB to compensate for differing heat vs humidity can easily result in cooked drivers or overly compressed distorted "sizzle", and an automatic HF compensation device would require separate algorithms for each portion of the system that covers a different distance. Art [/QUOTE]
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