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2. Psychoacoustics - Wikipedia

   en.wikipedia.org/wiki/Psychoacoustics

   Telephone networks and audio noise reduction systems make use of this fact by nonlinearly compressing data samples before transmission and then expanding them for playback. [4] Another effect of the ear's nonlinear response is that sounds that are close in frequency produce phantom beat notes, or intermodulation distortion products. [5]

3. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Various earmuff hearing protectors. Sound levels of some daily activities. A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss.

4. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   In contrast, other active noise and vibration control products use soft real-time digital processing. According to an experiment conducted to test how lightweight earphones reduced noise as compared to commercial headphones and earphones, lightweight headphones achieved better noise reduction than normal headphones.

5. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   The noise reduction of passive earplugs varies with frequency but is largely independent of level (soft noises are reduced as much as loud noises). As a result, while loud noises are reduced in level, protecting hearing, it can be difficult to hear low level noises.

6. Speech enhancement - Wikipedia

   en.wikipedia.org/wiki/Speech_enhancement

   Enhancing of speech degraded by noise, or noise reduction, is the most important field of speech enhancement, and used for many applications such as mobile phones, VoIP, teleconferencing systems, speech recognition, speaker diarization, and hearing aids. [1] [2]

7. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   Hearing protector fit-testing is a method that measures the degree of noise reduction obtained from an individual wearing a particular hearing protection device (HPD) - for example, a noise canceling earplug or earmuff. Fit testing is necessary due to the fact that noise attenuation varies across individuals.

8. Dying To Be Free - The Huffington Post

   projects.huffingtonpost.com/dying-to-be-free...

   The last image we have of Patrick Cagey is of his first moments as a free man. He has just walked out of a 30-day drug treatment center in Georgetown, Kentucky, dressed in gym clothes and carrying a Nike duffel bag.

9. List of noise topics - Wikipedia

   en.wikipedia.org/wiki/List_of_noise_topics

   Effective input noise temperature; Environmental noise; Equivalent noise resistance; Equivalent pulse code modulation noise; Errors and residuals in statistics; Fixed pattern noise; Flicker noise; Gaussian noise; Generation-recombination noise; Image noise; Image noise reduction; Intermodulation noise; Internet background noise; ITU-R 468 noise ...