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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 ...
Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
The Aztec death whistle or ehecachichtli is a type of whistle formerly used by the Mexica people. Though the original whistles likely made a soft wind sound, modern replicas usually produce a high-pitched shrieking sound and are most commonly used to scare off people or animals.
According to Guinness World Records, the highest pitch human whistle ever recorded was measured at 10,599 Hz, which corresponds to an E9 musical note. This was done by Joshua Lockard in Southlake, Texas, on May 1, 2019. [5] The lowest pitch whistle ever recorded was measured at 174.6 Hz, which corresponds to an F3 musical note.
A wheeze is a clinical symptom of a continuous, coarse, whistling sound produced in the respiratory airways during breathing. [1] For wheezes to occur, part of the respiratory tree must be narrowed or obstructed (for example narrowing of the lower respiratory tract in an asthmatic attack), or airflow velocity within the respiratory tree must be heightened.
Ululation (/ ˌ j uː lj ʊ ˈ l eɪ ʃ ən, ˌ ʌ l-/ ⓘ, [1] [2] from Latin ululo), trilling or lele, is a long, wavering, high-pitched vocal sound resembling a howl with a trilling quality. It is produced by emitting a high pitched loud voice accompanied with a rapid back and forth movement of the tongue and the uvula. [3]
While it is used to imitate sounds wild animals make, it can produce sustained sound, a sharp, high-pitched whistle. [1] [2] Players can control the pitch and make songs, normally solo, but sometimes with other instruments. [1] [3]
The Deutsche Reichsbahn of Germany introduced another whistle design in the 1920s called "Einheitspfeife", conceived as a single-note plain whistle which already had a very deep-pitched and loud sound, but if the whistle trigger is just pulled down half of its way an even lower tone like from a chime-whistle could also be caused. This whistle ...
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