Active noise reduction in-ear type earphone

Abstract

The invention relates to an active noise reduction in-ear type earphone, and relates to the technical field of communication. The active noise reduction in-ear type earphone comprises an earphone shell, a rear cavity, an intermediate cavity and a front cavity are arranged in the earphone shell, a feedforward microphone is arranged in the rear cavity in a transverse manner, the bottom of the front cavity is a sound outlet used for transmitting sounds, a feedback microphone is arranged in the front cavity, the earphone shell is also provided with a front cavity air vent hole communicating with the front cavity, the front cavity air vent hole is located on the earphone shell with the same direction of a feedforward sound-receiving port, and an included angle between the central axis of the front cavity air vent hole and the central axis of the feedforward sound-receiving port is less than 90 degrees. Compared with the conventional earphone, noises enter the earphone from the front cavity air vent hole, when the noises entering the front cavity air vent hole are from different directions, channels from which the noises enter an ear canal are more consistent, the changes of the active noise reduction performance are more consistent in high frequency, and the filter targets of different noises entering the front cavity air vent hole from different directions are more consistent.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an earphone, in particular to an active noise reduction in-ear earphone. Background technique [0002] Commonly used earphones are mainly composed of four parts: headband, sounding unit, earmuffs and lead wires; the headband is used to fix the earmuffs on the ears, and the lead wires are used to transmit audio signals from the speaker to the sounding unit, and the sounding unit is set on Inside the earmuffs. Existing headphones usually have a noise reduction function, and a microphone is installed outside the left and right earmuffs to collect sound samples. When the external noise is more diverse and changeable, each earmuff has only one sampling microphone that collects all noise The direction of noise sampling is narrow and imprecise, which makes it impossible to achieve high-quality noise reduction. In order to solve the above-mentioned defects of earphones, there is ...

AI Technical Summary

Problems solved by technology

The traditional structure of setting the front cavity vent on the shell corresponding to the pronunciation surface of the pronunciation unit, when the noise comes from different directions, the passage of the noise into the ear canal is inconsistent, especially at higher frequencies. At the same time, The amplitude of the filter target varies significantly in different noise directions, which affects the overall noise reduction effect

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