Noise reduction method of earphone, self-adaptive FIR filter, denoising filter bank and earphone

Abstract

The invention relates to a noise reduction method of an earphone, a self-adaptive FIR filter, a denoising filter bank and the earphone. The noise reduction method comprises the following steps: acquiring an external environment noise signal; filtering by using a first infinite impulse response (IIR) filter based on the external environment noise signal to obtain a first noise reference signal so as to counteract the effects of the external microphone and the loudspeaker; collecting a residual noise signal, and adjusting a coefficient of a first finite impulse response (FIR) filter based on theresidual noise signal and the first noise reference signal; filtering the first noise reference signal using a first FIR filter, and outputting an in-ear reverse noise via a speaker to cancel the in-ear reverse noise over the air from the noise entering the ear. According to the method, the filter coefficient of the FIR filter can be adaptively adjusted according to any one of the earphone wearing posture, the ear structure and the noise scene change, and under the conditions that adaptive rapid convergence is achieved and the order of the FIR filter is low, a good suppression effect on noiseunder different conditions is achieved.

Description

Technical field [0001] The present disclosure relates to earphones and a noise reduction method of earphones, and more specifically, to a noise reduction method of earphones, an adaptive FIR filter, a denoising filter bank and earphones. Background technique [0002] With the progress of society and the improvement of people's living standards, headphones have become an indispensable daily necessities for people. Earphones with active noise suppression are more and more widely recognized by the market and customers. Such earphones can enable users to enjoy a comfortable noise reduction experience in various noisy environments such as airports, subways, airplanes, and restaurants. [0003] However, different noise conditions and different earphone structures will affect the active noise suppression function of existing earphones. First of all, the current active noise reduction solutions provided by earphones mostly allow users to select filter coefficients according to noise scene...

AI Technical Summary

Problems solved by technology

[0006] The present disclosure requires an adaptive active noise reduction method for earphones, an adaptive FIR filter, a noise removal filter bank, and an earphone, which can perform FIR filtering for any of earphone wearing posture, human ear structure, and noise scene changes. Adaptively adjust the filter coefficients of the filter, so that when the adaptive fast convergence is achieved and the order of the required FIR filter is low, the noise in different situations can be suppressed well.

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