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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. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   To prevent higher-frequency noise from reaching the ear, most noise-cancelling headphones depend on sound isolation or soundproofing. Higher-frequency sound has a shorter wavelength, and cancelling this sound would require locating devices to detect and counteract it closer to the listener's eardrum than is currently technically feasible or ...

4. Powered speakers - Wikipedia

   en.wikipedia.org/wiki/Powered_speakers

   An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...

5. Earmuffs - Wikipedia

   en.wikipedia.org/wiki/Earmuffs

   Active noise reduction earmuffs incorporate electronic noise cancellation or active noise cancellation to attenuate (roughly 26 dB NRR [21]) low frequency noise. [22] A microphone, circuit, and speaker inside the muff are used to actively cancel out noise.

6. 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]

7. Devialet - Wikipedia

   en.wikipedia.org/wiki/Devialet

   Heart Bass Implosion (HBI) is a technology that provides broader coverage of low-frequency sounds [35] and mimics the properties of a subwoofer. [8] Speaker Active Matching (SAM) is a signal processing mechanism that analyzes and adjusts sounds in real-time to "reproduce the exact acoustic pressure recorded by the microphone."