问题描述
我注意到在Apple的加速度计示例代码中他们使用常规和自适应低通滤波器，有什么区别？
I've noticed in Apple's accelerometer sample code they use both regular and adaptive low pass filters, what is the difference?
推荐答案
它们都是IIR一阶低通滤波器（与其他DSP技术相比，它具有简单，响应速度慢的特点）。对于更大的加速度，自适应滤波器切换到更高频率的滚降（因此变得更平滑但响应更快）。
They are both IIR 1st order low pass filters (simple, and laggy in responsiveness when compared with other DSP techniques). The adaptive filter switches to a higher frequency roll-off (and thus becomes even less smoothing but more responsive) for larger accelerations.
还有更高质量（更复杂）用于便携式游戏开发者经常使用的运动传感的DSP滤波技术。
There are other higher quality (and more complicated) DSP filtering techniques for motion sensing often used by portable game developers.
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