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Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.
The patent described how to cancel sinusoidal tones in ducts by phase-advancing the wave and canceling arbitrary sounds in the region around a loudspeaker by inverting the polarity. [3] In the 1950s Lawrence J. Fogel patented systems to cancel the noise in helicopter and airplane cockpits. In 1957 Willard Meeker developed a working model of ...
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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 .
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Zing Me is a social network operated by VNG, introduced in August 2009. It is integrated directly via the Zing system, with a variety of special applications like blogging, photo and music sharing, gaming, video clips, and email. In addition, Zing Me was the first social network in Vietnam that had the properties of a platform.
So the application of adaptive noise cancelling in active noise control is somewhat incidental and represents an intersection between the two fields that is a minute part of both fields. Active (acoustic) noise cancelling can be done with or without adaptive techniques and only a few noise cancelling headphones use adaptive processing.
Digital noise cancelling headphones reduce this problem with the inclusion of a software equaliser, also running on the DSP chip, to clean up the signal and improve the overall quality of audio produced by the headphones. Overall, Digital Noise cancelling headphones produce better fidelity sound than their analogue counterparts." Lance.