為了不要聽到耳機播放音樂以外的噪音,目前有兩種解決方案:一種是主動式消音(active noise cancellation),另一種是被動式隔音(passive noise isolation)。 第一種主動式消音的方法是耳機本身會附上一個麥克風,但是這個麥克風不是用來給你說話用的,而是取外界的噪音反相處理後,混合到音樂中,達到噪音互相抵銷的功能。然而這種作法有三個缺點,第一:需要額外的電池供應主動式消音功能。 第二:因為多了一個電池,耳機本身就會變笨重。第三:(對某些"欣賞"音樂的人來說)對音訊動手腳本身就是一種失真,這種技術頂多能讓你"聽"音樂,而不是"欣賞"音樂。至於被動式隔音,如果隔音做得好的話,外界的聲音至少可以被減到隨身聽只要放一點音量就可以完全覆蓋剩下的噪音的程度,對於耳朵的保護、音質的堅持都不失為一種很好的解決方案。 以下的文章取自ZDnet ( FW from ZDnet/News&Blogs/David Morgenstern's article) A vote for passive noise isolation, not active reduction flight to NYC I took this week, many travelers are using active noise-reduction technology to shut out the din of the airplane. However, I prefer the passive approach of noise isolation, which is a greener solution, and provides more accurate sound. The earbuds in question were a pair of Etymotic Research ER•4 MicroPro earphones that I purchased at the Macworld Expo in January. The company offers a substantial discount during the show and I splurged o...