The brain needs to compare and contrast loudness, pitch and the phase (timing) of the sounds from the two ears to make sense of it!

大脑需要进行比较和对比，响度，音调和第一阶段（时间）的声音，从两个耳朵，使责任感！

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The slope efficiency of the in-phase mode is 37%. For the two core space cases, the steady high-contrast interference strips are observed.

对于两种不同的纤芯距离都观测到稳定的高对比度干涉条纹。

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Photo Rumors hears the two shooters will switch to a newer, faster hybrid (both contrast and phase detection) focusing system that also includes Sony NEX-style manual focus peaking, which provides a rough visual guide as to when a subject is as sharp as possible.

ENGADGET: Fujifilm X20 and X100s details reportedly leak, put focus at center stage

Even the advanced two-stage focusing system has made its way from the T4i, which utilizes both phase-difference and contrast AF in order to achieve focus more efficiently when capturing video.

ENGADGET: Canon EOS M mirrorless camera hands-on (video) Hands-on