Active noise reduction earphone based on multistage amplification circuit

The utility model discloses an active noise reduction earphone based on a multistage amplification circuit. The active noise reduction earphone comprises a noise collection module, a control module, an active noise reduction module and an earphone built-in loudspeaker. According to the utility model, the power limitation problem of the broadband amplification circuit is solved through the amplification unit and the amplification factor attenuation unit, the dynamic range of noise offset is expanded, and the noise reduction requirement of the earphone in a high-decibel periodic low-frequency noise prominent environment can be met. 本实用新型公开一种基于多级放大电路的主动降噪耳机，包括噪音收集模块、控制模块、主动降噪模块和耳机内置扬声器；本实用新型通过放大单元和放大倍数衰减单元解决宽频放大电路的功率限制问题，扩大了抵消噪声的动态范围，可以满足高分贝周期性低频噪声突出环境下的耳机降噪需求。