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2. Day-night average sound level - Wikipedia

   en.wikipedia.org/wiki/Day-Night_Average_Sound_Level

   The day-night average sound level (Ldn or DNL) is the average noise level over a 24-hour period. The noise level measurements between the hours of 22:00 and 07:00 are artificially increased by 10 dB before averaging. This noise is weighted to take into account the decrease in community background noise of 10 dB during this period.

3. Best noise-canceling headphones, according to Consumer Reports

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

   Learn more about Select and Consumer Reports. The story goes that Amar Bose, founder of the audio company that bears his name, got the idea for noise-canceling headphones one day in 1978 when he ...

4. Dolby noise-reduction system - Wikipedia

   en.wikipedia.org/wiki/Dolby_noise-reduction_system

   A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...

5. Consumer Reports - Wikipedia

   en.wikipedia.org/wiki/Consumer_Reports

   Consumer Reports Best Buy Drugs is available free on Consumer Reports Health.org. It compares prescription drugs in over 20 major categories, such as heart disease, blood pressure and diabetes, and gives comparative ratings of effectiveness and costs, in reports and tables, in web pages and PDF documents, in summary and detailed form.

6. Noise pollution - Wikipedia

   en.wikipedia.org/wiki/Noise_pollution

   Westminster City Council has received more complaints per head of population than any other district in the UK with 9,814 grievances about noise, which equates to 42.32 complaints per thousand residents. Eight of the top 10 councils ranked by complaints per 1,000 residents are located in London. [108]

7. Optical comparator - Wikipedia

   en.wikipedia.org/wiki/Optical_comparator

   The profile projector is widely used for complex-shape stampings, gears, cams, threads and comparing the measured contour model.The profile projector is hence widely used in precision machinery manufacturing, including aviation, aerospace industry, watches and clocks, electronics, instrumentation industry, research institutes and detection metering stations at all levels, etc.

8. Day–evening–night noise level - Wikipedia

   en.wikipedia.org/wiki/Day–evening–night_noise...

   The day–evening–night noise level or L den is a 2002 European standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night [ 1 ] and it is primarily used for noise assessments of airports , busy main roads, main railway lines and in cities over 100,000 residents.

9. Noise-induced hearing loss - Wikipedia

   en.wikipedia.org/wiki/Noise-induced_hearing_loss

   A systematic-review conducted by the American Academy of Audiology Task Force On the Health-Related Quality of Life Benefits of Amplification in Adults found the use of hearing aids to increase quality of life. The review pertained to adults who experienced sensorineural hearing loss, which can be caused by excessive, loud noise. [140]