Improved self-adaptive noise reduction earphone and noise reduction method thereof

Abstract

The invention discloses an improved self-adaptive noise reduction earphone, which comprises an external microphone used for collecting external noise of an environment where the earphone is located; an inner microphone which is used for acquiring the same sound waveform heard by human ears; a first analog-to-digital converter which is respectively connected with the outer microphone and the innermicrophone and is used for converting waveforms collected by the outer microphone and the inner microphone into digital signals; a controller which is connected with the output end of the first analog-to-digital converter and used for receiving the digital signal and controlling system output; the controller comprises a weight filter for extracting an effective area of the noise signal and a self-adaptive filter for performing real-time self-adaptive adjustment on the system by taking the error signal and the noise signal as variables; and a second analog-to-digital converter which is connected with the output end of the controller and is used for converting the digital signal output by the controller into an audio signal. The method is used for inhibiting the high-frequency signal upliftphenomenon caused by system delay in the noise reduction earphone and enhancing the performance of the noise reduction system in a non-Gaussian noise environment.

Description

technical field [0001] The invention relates to the field of noise reduction earphones, in particular to an improved self-adaptive noise reduction earphone and a noise reduction method thereof. Background technique [0002] Noise-cancelling headphones, originally a special equipment for pilots, have become entertainment products in daily life with the development of the electronics industry and the popularization of technology. The principle of all active noise reduction headphones on the market is basically the same, that is, to collect external noise and invert the output to offset the external noise. Generally, the frequency of noise processed by active noise reduction headphones is between 50 and 1000 Hz. [0003] At present, the active noise reduction earphone circuit part is mainly divided into two types: analog circuit and digital circuit. The former system responds quickly, but the parameters are fixed and cannot be adjusted; the latter parameters are adjustable, bu...

AI Technical Summary

Problems solved by technology

However, the noise in many typical noise cancellation scenarios is not Gaussian distributed, such as underwater acoustic signals, low-frequency atmospheric signals, and many artificially generated noises, which will lead to performance degradation in systems designed under Gaussian assumptions

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