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2. Dog whistle - Wikipedia

   en.wikipedia.org/wiki/Dog_whistle

   In addition to lung-powered whistles, there are also electronic dog whistle devices that emit ultrasonic sound via piezoelectric emitters. [3] The electronic variety are sometimes coupled with bark-detection circuits in an effort to curb barking behaviour. This kind of whistle can also be used to determine the hearing range for people and for ...

3. Been Caught Stealing - Wikipedia

   en.wikipedia.org/wiki/Been_Caught_Stealing

   Different versions appear on the compilations Kettle Whistle, Up from the Catacombs – The Best of Jane's Addiction and Rev. The tune later appeared in the 2004 video game Grand Theft Auto: San Andreas on the fictional in-game radio station "Radio X". Among its highlights are what Rolling Stone dubbed "the best use of dog barks since Pet Sounds".

4. Shepherd's whistle - Wikipedia

   en.wikipedia.org/wiki/Shepherd's_whistle

   This space acts as a sound box; the sound resonates in it. Blowing over the lip of a bottle or jug also makes resonances by blowing across an opening. Unlike typical, single-tone whistles, the shepherd's whistle can emit a range of pitches, by using the tongue and mouth to change the shape and size of the "sound box".

5. Physics of whistles - Wikipedia

   en.wikipedia.org/wiki/Physics_of_whistles

   A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...

6. Devocalization - Wikipedia

   en.wikipedia.org/wiki/Devocalization

   The devocalization procedure does not take away a dog's ability to bark. Dogs will normally bark just as much as before the procedure. After the procedure, the sound will be softer, typically about half as loud as before, or less, and it is not as sharp or piercing. [3] Most devocalized dogs have a subdued "husky" bark, audible up to 20 metres. [4]

7. Doctors Say This Nighttime Behavior Can Be A Sign Of Dementia

   www.aol.com/lifestyle/doctors-nighttime-behavior...

   Here's how to distinguish "sundowning"—agitation or confusion later in the day in dementia patients—from typical aging, from doctors who treat older adults.