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回4楼：这个很简单啊。首先这个设备随时处于记录模式。同时有一个运行时的缓存，大小刚好够5分钟的内容。它始终存贮当前时刻以前最近的五分钟的内容。感觉到变化时，把这个缓存的内容复制到文件存下来。如果没有感觉到变化，这个缓存最旧的信息就被最新的冲掉。一直如此循环即可。
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Reader Comments (Page 1 of 1)
samsonsu.mobile @ Mar 5th 2008 3:39AM
回4楼：这个很简单啊。首先这个设备随时处于记录模式。同时有一个运行时的缓存，大小刚好够5分钟的内容。它始终存贮当前时刻以前最近的五分钟的内容。感觉到变化时，把这个缓存的内容复制到文件存下来。如果没有感觉到变化，这个缓存最旧的信息就被最新的冲掉。一直如此循环即可。