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2. Speckle (interference) - Wikipedia

   en.wikipedia.org/wiki/Speckle_(interference)

   Speckle, speckle pattern, or speckle noise designates the granular structure observed in coherent light, resulting from random interference. Speckle patterns are used in a wide range of metrology techniques, as they generally allow high sensitivity and simple setups.

3. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.

4. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Active noise-cancelling headphones use a microphone, amplifier, and speaker to pick up, amplify, and play ambient noise in phase-reversed form; this to some extent cancels out unwanted noise from the environment without affecting the desired sound source, which is not picked up and reversed by the microphone. They require a power source ...

5. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

   www.aol.com/noise-canceling-headphones-harmful...

   The good news is that noise-canceling headphones can benefit your ears in certain situations. A few of those situations could be blocking out background noise in a busy coffee shop, blaring ...

6. Safe listening - Wikipedia

   en.wikipedia.org/wiki/Safe_listening

   Noise-cancelling headphones and sound-isolating earphones can help one avoid turning the volume up to overcome loud background noise. Sound measurement apps can help one find out how loud sounds are. If not measuring the sound levels, a good rule of thumb is that sounds are potentially hazardous if it is necessary to speak in a raised voice to ...

7. Best noise-canceling headphones, according to Consumer ... - AOL

   www.aol.com/news/best-noise-canceling-headphones...

   These headphones don’t have the latest features—like a monitor mode or adjustable noise cancellation—but they deliver where it matters most: above-average sound quality and fantastic sound ...

8. Shearography - Wikipedia

   en.wikipedia.org/wiki/Shearography

   Shearography or Speckle pattern shearing interferometry is a measuring and testing method similar to holographic interferometry. It uses coherent light or coherent soundwaves [ 1 ] to provide information about the quality of different materials in nondestructive testing , strain measurement, and vibration analysis.

9. What Is "Food Noise" & How to Safely Stop It - AOL

   www.aol.com/food-noise-safely-stop-125700076.html

   3. Speak to a Therapist. Food noise doesn’t just affect your physical health — you may find it affects your mental health too. If you’re experiencing symptoms of anxiety or depression — or ...