Active noise reduction algorithm and active noise reduction earphone

Abstract

The invention relates to the technical field of noise reduction headphones, in particular to an active noise reduction algorithm and an active noise reduction headphone; the active noise reduction algorithm comprises an acoustic structure, the acoustic structure comprises a front shell and a rear shell, the front shell is provided with a front cavity, the front shell is further provided with a middle cavity, a hole channel and a leakage hole, and a resonance damping loudspeaker box used for installing a loudspeaker is arranged in the middle cavity; wherein the two hole channels are symmetrically arranged; the front shell is further provided with an annular balance sound channel, and the two hole channels are communicated through the annular balance sound channel. According to the active noise reduction algorithm and the active noise reduction earphone, the consistency of the earphone when being designed and worn by a real person can be improved; meanwhile, the reduction degree of the frequency response range is reduced, and the sensitivity of an earphone loudspeaker can be guaranteed. By means of the active noise reduction algorithm, in the noise reduction performance test process, the FF and FB target curves of two pairs of stereo headphones or four TWS headphones can be obtained at the same time in a non-intrusive noise reduction parameter measurement mode, noise reduction microphone signals do not need to be led out from the headphones for measurement, and signals do not need to be emitted to headphone loudspeakers for measurement either.

Description

technical field [0001] The invention relates to the technical field of noise reduction earphones, in particular to an active noise reduction algorithm and an active noise reduction earphone. Background technique [0002] The basic principle of noise-cancelling headphones is to pick up the noise signal through an external microphone, and then pass the signal to the filter. A signal that is the inverse of the internal noise signal, thereby canceling out the noise. [0003] In the production of noise-canceling headphones, it is necessary to consider whether the design of the headphones can ensure the consistency of leakage when worn by real people. The common method in design is to increase the leakage resistance of the front cavity, but this will lead to a narrower frequency response range and lower the earphone’s performance. sensitivity. Contents of the invention [0004] The object of the present invention is to provide an active noise reduction algorithm and an active ...

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Problems solved by technology

[0003] In the production of noise-canceling headphones, it is necessary to consider whether the design of the headphones can ensure the consistency of leakage when worn by real people. The common method in design is to increase the leakage resistance of the front cavity, but this will lead to a narrower frequency response range and lower the earphone’s performance. sensitivity

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