折叠频率为采样频率的一半。 举例： 采样间隔为dt=8ms=0.008s，采样频率为ft=1/dt=125Hz，折叠频率为fN=1/2ft=62.5Hz.
本文探索讨论的减小待机功率的方法有：频率折叠、周期跳空，各种启动电路的影响，以及开关损耗。
The methods for reducing standby power that will be explored in this article are: frequency foldback, skip cycle, the effect of different types of start-up circuits, and switching losses.
的SI - X系列有三（3）潜艇可以帮助：许仕12BX与许仕15BX折叠号角，让您最低的频率和力度需要。
The SI-X series has three (3) subs can help: SI-12BX & SI-15BX are folded horns that give you the lowest frequencies and the punch you need.
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