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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

3. Active sound design - Wikipedia

   en.wikipedia.org/wiki/Active_sound_design

   Active sound design is an acoustic technology concept used in automotive vehicles to alter or enhance the sound inside and outside of the vehicle. Active sound design (ASD) often uses active noise control and acoustic enhancement techniques to achieve a synthesized vehicle sound. The typical implementations of ASD vary, from amplifying or ...

4. 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 ...

5. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Lotus later teamed with Harman in 2009 to develop a more complete noise reduction system, including road and tire noise as well as chassis vibrations. [30] One benefit of active noise control is that the car can weigh less, with less sound-deadening material used, and without a heavy balance shaft in the engine.

6. Roadway noise - Wikipedia

   en.wikipedia.org/wiki/Roadway_noise

   Roadway noise. Roadway noise is the most prevalent form of environmental noise. Pictured: São Paulo, Brazil. Roadway noise is the collective sound energy emanating from motor vehicles. It consists chiefly of road surface, tire, engine /transmission, aerodynamic, and braking elements. Noise of rolling tires driving on pavement is found to be ...

7. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Industrial noise control is a subset of interior architectural control of noise, with emphasis on specific methods of sound isolation from industrial machinery and for protection of workers at their task stations. Sound masking is the active addition of noise to reduce the annoyance of certain sounds, the opposite of soundproofing.

8. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [3][4] Changes in the immune system and birth defects have been also attributed to noise exposure. [5] Although age-related health effects (presbycusis) occur naturally with age, [6] in many ...

9. Automotive aerodynamics - Wikipedia

   en.wikipedia.org/wiki/Automotive_aerodynamics

   Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high speeds. Air is also considered a fluid in this case. For some classes of racing vehicles, it may also be ...