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2. 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. HPDs reduce the level of the noise entering the ear.

3. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Several commercial applications have been successful: noise-cancelling headphones, active mufflers, anti-snoring devices, vocal or center channel extraction for karaoke machines, and the control of noise in air conditioning ducts. The term "1-dimension" refers to a simple pistonic relationship between the noise and the active speaker ...

4. Assistive listening device - Wikipedia

   en.wikipedia.org/wiki/Assistive_Listening_Device

   A common usage is to aid people who are hard of hearing (HOH) by amplification and providing a better signal to noise ratio (SNR). The ALD may be used to help HOH people hear televisions [1] and other audio devices, [2] or to help people hear speech through public address or sound reinforcement systems, such as in places of worship or lectures.

5. Output device - Wikipedia

   en.wikipedia.org/wiki/Output_device

   Examples include monitors, printers, speakers, headphones, projectors, GPS devices, optical mark readers, and braille readers. In an industrial setting, output devices also include "printers" for paper tape and punched cards, especially where the tape or cards are subsequently used to control industrial equipment, such as an industrial loom ...

6. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   Most external microphone designs are of either omnidirectional or noise-canceling type. Noise-canceling microphone headsets use a bi-directional microphone as elements. A bi-directional microphone's receptive field has two angles only. Its receptive field is limited to only the front and the direct opposite back of the microphone.

7. History of hearing aids - Wikipedia

   en.wikipedia.org/wiki/History_of_hearing_aids

   Technically this was a wearable hearing aid though it was not self contained and the range the user could use it was limited by the range of the wireless connection and the external minicomputer was extremely heavy and nearly impossible to move [2] Oticon hearing aids to be used with Bluetooth wireless devices.