ACTIVE NOISE CANCELLATION SYSTEM FOR HEADPHONE
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United States of America Patent
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Aug 29, 2019
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Sep 14, 2017
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Sep 16, 2016
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Abstract
An active noise cancellation system comprising an active noise cancellation circuit connected to a microphone arranged to sense environmental noise, the active noise cancellation circuit comprising:—an analog-to-digital converter (ADC) arranged to convert the sensed environmental noise to a digital environmental noise signal,—a prediction filter configured for predicting a plurality D of inverted digital environmental noise samples and generating a digital inverted environmental noise signal,—a digital-to-analog converter (DAC) to convert the digital inverted environmental noise signal to an analog inverted environmental noise signal for cancelling the environmental noise.
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