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入手了一个降噪耳机，发现主动降噪简直太厉害了
source link: https://www.v2ex.com/t/478916
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硬件 - @crazygod - 原来没用过感觉效果有限，结果今天在公交车上用，这台公交车比较老了，引擎声特别吵的那种，结果。。带上耳机就算不听歌打开降噪也能感受到一时的平静，基本能过滤掉百分之 90，包括交谈声，语音播报，引擎，只能
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