Cigarette taxes are also associated with low smoking rates, though it's not clear whether taxes discourage smoking or whether states with fewer smokers are more likely to pass high cigarette taxes.
与吸烟人口比例相关的另一个因素是税收，尽管目前尚不清楚是较高的税率挫败了吸烟行为，还是少数烟民才能承担高税收。
Removing high frequency noise pulses by a low-pass filter and Schmitt-trigger.
用一低通滤波器和施密特触发器排除高频噪声脉冲。
Accelerometer readings can be jerky and noisy. Applying low-pass filtering on the signal allows you to smooth it and get rid of high frequency noise.
加速度传感器数值可能被颠簸和噪音影响。应用低通过滤器在信号上可以是它平滑，并摆脱高频噪音的干扰。
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