Earphone adaptive active noise control system and method

Abstract

The invention discloses an earphone adaptive active noise control system and method. The system at least comprises a reference microphone which is used for collecting reference noise signals; an errormicrophone which is used for collecting error noise signals, wherein the reference microphone is set out of an earphone, and the error microphone is set in the earphone; a loudspeaker unit which is used for playing secondary sound signals; two analog-to-digital converters Ads which are respectively used for converting the reference noise signals and the error noise signals into corresponding digital signals; a digital-to-analog converter DA which is used for converting filtered output signals into analog signals and feeding back the analog signals to a secondary loudspeaker; and a processor which is used for updating a filtering coefficient and generating input signals of the secondary loudspeaker. According to the method, the problem that a common adaptive algorithm is insufficient in real-time tracking capability and excessive in computing delay is solved. The method has relatively good adaptivity to different environments and different earphone wearing modes. The earphone adaptiveactive noise control convergence performance and tracking performance are improved.

Description

technical field [0001] The invention relates to the field of noise elimination, in particular to an earphone adaptive active noise control system and method. Background technique [0002] Noise affects people's life all the time. For example, in the cabin, subway and office environment, people are disturbed by noise all the time. The existence of noise makes people feel restless and restless. Harm has always been one of the important goals of scientific research. Scientific research shows that long-term exposure to strong noise can easily lead to permanent loss of all or part of the hearing frequency sensitivity, and even cause deafness. There are two main ways to reduce noise: active noise control and passive noise control. Passive noise control mainly uses the reflection of special materials to isolate sound transmission or uses the porosity and viscosity of materials to attenuate the passing sound energy. Passive noise control methods are more effective for high-frequen...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to provide an earphone adaptive active noise control system and method, which can solve the problems of insufficient real-time tracking ability and excessive calculation delay of ordinary adaptive algorithms, and is suitable for different It has good adaptive performance in different environments and different earphone wearing styles, which improves the convergence performance and tracking performance of adaptive active noise control for earphones

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