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2. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   Website. www .bluetooth .com. A Bluetooth earbud, an earphone and microphone that communicates with a cellphone using the Bluetooth protocol. Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs).

3. List of Bluetooth profiles - Wikipedia

   en.wikipedia.org/wiki/List_of_Bluetooth_profiles

   Bluetooth HID is a lightweight wrapper of the human interface device protocol defined for USB. The use of the HID protocol simplifies host implementation (when supported by host operating systems) by re-use of some of the existing support for USB HID in order to support also Bluetooth HID. Keyboard and keypads must be secure.

4. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   Wireless speakers are loudspeakers that receive audio signals using radio frequency (RF) waves rather than over audio cables. The two most popular RF frequencies that support audio transmission to wireless loudspeakers include a variation of WiFi IEEE 802.11, while others depend on Bluetooth to transmit audio data to the receiving speaker.

5. How noise cancelling headphones work - AOL

   www.aol.com/news/noise-cancelling-headphones...

   Active noise cancellation in earbuds can’t quite compare with in-ear models, but that won’t stop Bose from trying — and these QuietComfort earbuds do an astonishing job of implementing ANC ...

6. Surround sound - Wikipedia

   en.wikipedia.org/wiki/Surround_sound

   Surround sound. Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener ( surround channels ). Its first application was in movie theaters. Prior to surround sound, theater sound systems commonly had three screen channels of sound that ...

7. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather ...