With video analytics, video recordings caused by irrelevant background noise is greatly reduced, resulting in less disk space required for the same 7-day period.
使用视频分析，由不相关的背景噪音引起的视频记录大大减少，从而减少相同7天周期内所需的磁盘空间。
2
The output of the hysteresis comparator can be delay for a period of time, so the noise can be effectively prevented .
翻转会比没有加入迟滞效应的比较器延迟一段时间，可以有效地避免噪声影响。
3
Period characteristics of radiated noise at high frequency is investigated by a method based on short time Fast Fourier Transformation, and propeller speed is estimated.