Thread: [Ideas] Sound or app that keep dog away
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Duffer is offline Duffer
2011-06-08 , 12:12
Posts: 223 | Thanked: 52 times | Joined on Sep 2009 @ West Kirby, UK
#20
According to a quick google scholar search http://www.freepatentsonline.com/y2009/0038664.html

Indicates at least 20KHz

Another search seems to suggest that the range of frequencies smartphone speakers can output is only 300 to 4k to be exact (EX Smartphone audio engineer)

Source http://acapella.harmony-central.com/...requency-range

Sorry doesn't look good?
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