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2. Acoustic harassment device - Wikipedia

   en.wikipedia.org/wiki/Acoustic_harassment_device

   These often employ shrill sounding screams broadcast between 12 and 17 kHz. Acoustic deterrent devices normally broadcast near 10 kHz and use high volume. [3] The intensity level of acoustic harassment devices has been measured up to 194 dB re 1uPa @ 1 m and the noise can be audible up to 50 kilometers away. [3]

3. Assistive listening device - Wikipedia

   en.wikipedia.org/wiki/Assistive_Listening_Device

   An assistive listening device (ALD) is part of a system used to improve hearing ability for people in a variety of situations where they are unable to distinguish speech in noisy environments. Often, in a noisy or crowded room it is almost impossible for an individual who is hard of hearing to distinguish one voice among many.

4. Sound baffle - Wikipedia

   en.wikipedia.org/wiki/Sound_baffle

   A sound baffle is a construction or device which reduces the strength (level) of airborne sound. Sound baffles are a fundamental tool of noise mitigation, the practice of minimizing noise pollution or reverberation. An important type of sound baffle is the noise barrier constructed along highways to

5. What 'secret' loudspeaker codes mean at department stores - AOL

   www.aol.com/news/2010-10-13-what-secret...

   This "code" is one of many innocuous sounding secret codes that stores use to alert employees to problems without distracting you from shopping.

6. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   The most fertile areas for roadway noise mitigation are in urban planning decisions, roadway design, noise barrier design, [14] speed control, surface pavement selection, and truck restrictions. Speed control is effective since the lowest sound emissions arise from vehicles moving smoothly at 30 to 60 kilometers per hour.

7. 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.

8. I tried an EMF-blocking device to reduce my exposure to ... - AOL

   www.aol.com/finance/tried-emf-blocking-device...

   EMF mitigation devices. Somavedic says its EMF-blocking device can improve sleep and energy. I first discovered Somavedic by its beauty and thought it was an art piece for your home. When I dug ...

9. Sound masking - Wikipedia

   en.wikipedia.org/wiki/Sound_masking

   Sound masking is the inclusion of generated sound (commonly, though inaccurately, referred to as "white noise" or "pink noise") into an environment to mask unwanted sound. It relies on auditory masking. Sound masking is not a form of active noise control (noise cancellation technique); however, it can reduce or eliminate the perception of sound ...