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2. Noise-canceling microphone - Wikipedia

   en.wikipedia.org/wiki/Noise-canceling_microphone

   The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone. The circuit may employ passive or active noise canceling techniques to filter out the noise, producing an output signal that has a lower noise floor and a higher signal-to-noise ratio .

3. 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 ...

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

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

   Walmart security watches shoppers enter on Black Friday This "code" is one of many innocuous sounding secret codes that stores use to alert employees to problems without distracting you from shopping.

5. Echo suppression and cancellation - Wikipedia

   en.wikipedia.org/wiki/Echo_suppression_and...

   Echo cancellers must be adaptive because the characteristics of the near-end's speaker and microphone are generally not known in advance. The acoustical attributes of the near-end's room are also not generally known in advance, and may change (e.g., if the microphone is moved relative to the speaker, or if individuals walk around the room ...

6. Beats Electronics - Wikipedia

   en.wikipedia.org/wiki/Beats_Electronics

   Beats Electronics LLC (also known as Beats by Dr. Dre, or simply Beats by Dre) is an American consumer audio products manufacturer headquartered in Culver City, California. [ 1][ 2] The company was founded in 2006 by music producer Dr. Dre and record company executive Jimmy Iovine. Since 2014, it has been an Apple subsidiary.

7. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

8. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Active noise-cancelling headphones use a microphone, amplifier, and speaker to pick up, amplify, and play ambient noise in phase-reversed form; this to some extent cancels out unwanted noise from the environment without affecting the desired sound source, which is not picked up and reversed by the microphone. They require a power source ...

9. List of speakers of the United States House of Representatives

   en.wikipedia.org/wiki/List_of_speakers_of_the...

   Official seal of the Speaker of the United States House of Representatives. Sam Rayburn, longest serving speaker of the House, 17 years, 53 days (cumulative) Tip O'Neill, longest uninterrupted tenure of office, 9 years, 350 days. Theodore M. Pomeroy, shortest tenure of office, 1 day. Rank.