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2. Respiratory sounds - Wikipedia

   en.wikipedia.org/wiki/Respiratory_sounds

   Respiratory sounds, also known as lung sounds or breath sounds, are the specific sounds generated by the movement of air through the respiratory system. [1] These may be easily audible or identified through auscultation of the respiratory system through the lung fields with a stethoscope as well as from the spectral characteristics of lung sounds. [2]

3. The Hum - Wikipedia

   en.wikipedia.org/wiki/The_Hum

   The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.

4. Wheeze - Wikipedia

   en.wikipedia.org/wiki/Wheeze

   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.

5. Mysterious high-pitched tone keeps Oregon residents up ... - AOL

   www.aol.com/article/2016/02/22/mysterious-high...

   An unexplained high-pitched tone has kept residents of a Portland suburb awake at night for at least a week. Mysterious high-pitched tone keeps Oregon residents up at night Skip to main content

6. Electromagnetically induced acoustic noise - Wikipedia

   en.wikipedia.org/wiki/Electromagnetically...

   These phenomena can potentially generate vibrations of the ferromagnetic, conductive parts, coils and permanent magnets of electrical, magnetic and electromechanical device, resulting in an audible sound if the frequency of vibrations lies between 20 Hz and 20 kHz, and if the sound level is high enough to be heard (e.g. large surface of ...

7. Noise levels on one London Underground line are officially ...

   www.aol.com/noise-levels-one-london-underground...

   Transport for London (TfL) said it was working to resolve the issue of the high-pitched noises. They said they have put plans in place to improve infrastructure along the Victoria line, yet TfL ...