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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise canceling is best suited for low frequencies. For higher frequencies, the spacing requirements for free space and zone of silence techniques become prohibitive. In acoustic cavity and duct-based systems, the number of nodes grows rapidly with increasing frequency, which quickly makes active noise control techniques unmanageable.

3. List of discontinued Bose headphones - Wikipedia

   en.wikipedia.org/wiki/List_of_discontinued_Bose...

   The noise cancelling hardware and micro-USB supported rechargeable battery is contained with a box located near the headphone jack, similar to the QuietComfort 1. The earbuds are similar to the IE2 headphones. A button on the remote labelled "Aware Mode" reduces noise cancellation to let in ambient noise. These headphones are discontinued.

4. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Fogel is considered to be the inventor of active noise cancellation, and he designed one of the first noise-cancelling headphones systems. Later on, Willard Meeker designed an active noise control model that was applied to circumaural earmuffs for advanced hearing protection. Noise-cancelling aviation headsets are now commonly available. [5] [6]

5. 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.

6. Acura RL - Wikipedia

   en.wikipedia.org/wiki/Acura_RL

   Whereas the former ANC was set to cancel out only low frequency noises from the engine and exhaust, the MMC system, called Active Sound Control, was expanded in its range to cancel some higher frequency road and tire noise. Unlike its predecessor ANC, Active Sound Control was now linked to throttle position and engine RPM to provide a quieter ...

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. Active sound design - Wikipedia

   en.wikipedia.org/wiki/Active_sound_design

   Active noise cancelling (ANC) is a software process that uses existing in-vehicle infotainment hardware to eliminate undesirable noise within the interior of a vehicle. This elimination technique is known as harmonic order reduction, where unwanted audio signals are identified by sensors and filtered out of the overall interior vehicle sound. [3]

9. Hush kit - Wikipedia

   en.wikipedia.org/wiki/Hush_kit

   Hush kit for the Pratt and Whitney JT8D-1 through -17 engines Two JT4As installed on a KLM DC-8. A hush kit is an aerodynamic device used to help reduce the noise produced by older aircraft jet engines. These devices are typically installed on older turbojet and low-bypass turbofan engines, as they are much louder than later high-bypass ...