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2. Noise curve - Wikipedia

   en.wikipedia.org/wiki/Noise_curve

   Noise curves are a common way to characterise background noise in unoccupied buildings and spaces. [1] Their purpose is to produce a single-value representation of a complete sound spectrum. International standards organizations ( ISO , [ 2 ] ANSI [ 3 ] and ASA ) recognize the need to objectify judgements on the amount of ambient noise in ...

3. Doctors Say This Type Of Noise Is Best For Deep Sleep - AOL

   www.aol.com/doctors-type-noise-best-deep...

   If you want to give white noise a try, Dr. Maddox recommends keeping it at a low decibel level and not blasting it all day, as playing white noise at high decibels can cause long-term issues with ...

4. 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.

5. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Sound levels as low as 40 dB(A) can generate noise complaints [43] and the lower threshold for noise producing sleep disturbance is 45 dB(A) or lower. [ 44 ] Other factors that affect the annoyance level of sound include beliefs about noise prevention and the importance of the noise source, and annoyance at the cause (i.e., non-noise related ...

6. Sound reduction index - Wikipedia

   en.wikipedia.org/wiki/Sound_Reduction_Index

   The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...

7. Noise, vibration, and harshness - Wikipedia

   en.wikipedia.org/wiki/Noise,_vibration,_and...

   Noise, vibration, and harshness (NVH), also known as noise and vibration (N&V), is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with analytical ...