Tobii眼动仪 python SDK 时间同步的技巧

time_synchronization

首先官方Python - SDK reference guide中有一个time_synchronization_data.py的例子。官方注解如下：

You will get a callback when the computer and the eye trackers clocks gets synchronized. To handle normal drifts between clocks the clocks are checked on regular basis, and this results in that the time stamps are adjusted for the drifts in the data streams. This drift handling is done in real time. The data received from this event could be used for an even more accurate drift adjustment in the post processing. Callbacks will receive a TimeSynchronizationData object or a dictionary with values if as_dictionary is True.
中心思想能提高时间的漂移，提高时间同步的精度。

示例的代码，会间隔一段时间同时打印出三组时间戳

• system request time stamp
• device time stamp
• system response time stamp

此数据便是我们进行设备时间同步的关键依据。

• 但不理解的是这个模块内部运算规则是怎么进行的，三个时间戳间隔一段时间做差值进行比较？
• 哪一个时间戳是real time?

def execute(eyetracker):