Acoustic coupling structure of in-ear earphone cavity

Abstract

The invention discloses an acoustic coupling structure of an in-ear earphone cavity. The in-ear earphone comprises an earphone shell, a coupling cavity is formed in the side wall of the sound conduitof the earphone shell, the coupling cavity is located at the end, away from the silica gel sleeve of the in-ear earphone, of the sound conduit, a pressure relief through hole is further formed in theside wall of the earphone shell, and a damping piece is arranged on the inner side of the pressure relief through hole. Based on the Helmholtz resonance principle, the coupling cavity with a low quality factor (Q value) is formed in the inner wall of the sound conduit, and the high-Q-value resonance peak of 5-6 kHz is counteracted through reversed-phase resonance; the pressure relief through holeis formed in the side wall of the front cavity of the earphone shell; high-pass filtering is carried out in a pressure relief mode, the filtering cut-off frequency can be changed by adjusting the pupil sectional area, the damping piece is attached to the pupil sectional area to reduce the Q value and control the bass SPL, the structure plays a role in high-pass filtering, reflection of high pitchon the inner wall is remarkably reduced, standing waves are eliminated, and high-frequency resonance peaks under a pressure field are further reduced.

Description

technical field [0001] The invention relates to the technical field of earphones, in particular to an acoustic coupling structure of an in-ear earphone cavity. Background technique [0002] Miniature speakers (earphones) are different from ordinary speakers. Most of the time, they work in the sound field environment where the pressure field is dominant. To restore the sound quality of a good recording (recording is usually done under the monitor speaker), the micro speaker needs to make a frequency response (frequency amplitude response) curve that conforms to the diffuse field HRTF (Head Related Response Function) as much as possible. [0003] However, due to various characteristics such as the in-ear structure of the in-ear earphone, its frequency response curve often appears at 5kHz-6kHz with a high-Q resonant peak. In most cases, the resonant peak exists at the system resonant frequency f0 of the earphone in a free field. It is difficult to filter through ordinary sound...

AI Technical Summary

Problems solved by technology

[0003] However, due to various characteristics such as the in-ear structure of the in-ear earphone, its frequency response curve often appears at 5kHz-6kHz with a high-Q resonant peak. In most cases, the resonant peak exists at the system resonant frequency f0 of the earphone in a free field. position, it is difficult to filter through ordinary acoustic damping filters, causing a bottleneck in the sound quality of many in-ear headphones

[0004] Most headphone manufacturers choose to ignore this problem (most don't even pay attention to the fact that the video response curve needs to comply with HRTF to restore the sound quality), but the resonance peak of 5kHz-6kHz causes harsh human voice and occasional screaming problems when listening to music with headphones

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