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2. Acoustic foam - Wikipedia

   en.wikipedia.org/wiki/Acoustic_foam

   A close-up image of acoustic foam.. Acoustic foam is an open celled foam used for acoustic treatment.It attenuates airborne sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1]

3. Swimming machine - Wikipedia

   en.wikipedia.org/wiki/Swimming_machine

   A swimming machine, also known as a resistance swimming apparatus, is a self-contained device powered by a pump, designed to facilitate stationary swimming for athletes or recreational users. This can be achieved by either propelling water past the swimmer or providing support for the swimmer, either within a water environment or on dry land.

4. Buy Quiet - Wikipedia

   en.wikipedia.org/wiki/Buy_Quiet

   Buy Quiet programs seek to minimize the impact of noise on communities and help companies comply with OSHA and other noise regulation requirements as well. Additionally, Buy Quiet concepts may reduce the long-term costs of audiometric testing, personal protective equipment, and workers’ compensation.

5. Category:Noise reduction - Wikipedia

   en.wikipedia.org/wiki/Category:Noise_reduction

   Image noise reduction techniques (19 P) N. Noise reduction systems (3 C, 9 P) Pages in category "Noise reduction"

6. Noise reduction - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction

   Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode rejection ratio.

7. Acoustic quieting - Wikipedia

   en.wikipedia.org/wiki/Acoustic_quieting

   Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching an observer. Machinery vibrates, causing sound waves in air, hydroacoustic waves in water, and mechanical stresses in solid matter.