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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 ...
Noise-cancelling headphones often combine sound isolation with ANC to maximize the sound reduction across the frequency spectrum. Noise cancellation can also be used without sound isolation to make wanted sounds (such as voices) easier to hear. Noise cancellation to eliminate ambient noise is never passive because of the circuitry required, so ...
In a noisy environment, both microphones receive noise at a similar level, but the primary mic receives the desired sounds more strongly. Thus if one signal is subtracted from the other (in the simplest sense, by connecting the microphones out of phase) much of the noise is canceled while the desired sound is retained.
Bose Noise Cancelling Wireless Bluetooth Headphones 700, with Alexa Voice Control is on of the best active noise cancelling headphones in 2021. (Amazon / Amazon) Bose Noise Cancelling Wireless ...
Unlike its predecessors, the QC25s can be used (without the noise cancelling function) while the battery is dead. Another change is the elimination of the Hi/Low switch which increased the input gain for low-output sources like MP3 players. In 2015, the QC25s won the What Hi-Fi? Sound and Vision annual award for "Best Noise Cancelling Headphones".
Industrial noise control is a subset of interior architectural control of noise, with emphasis on specific methods of sound isolation from industrial machinery and for protection of workers at their task stations. Sound masking is the active addition of noise to reduce the annoyance of certain sounds, the opposite of soundproofing .
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