第三点是平台结束（upper plateau），第四点是高切频率（ high cut frequency），它们之间的滤波也是余弦窗口。低于低 切和高于高切的频谱都设为0。
基于8个网页-相关网页
High Mid and low Mid dials (blue) are each paired with a freq control (lighter blue) that allows you to select the frequency boosted or cut.
低中高表盘(蓝色)与一个引入FREQ控制(淡蓝色每个配对)，允许你选择的频率提高或降低。
High frequency electric knife or electric knife cut small rash.
高频电刀或电刀切小皮疹。
Many experiments on low cut filter were carry out to meet the requirement that balance of high frequency energy and low frequency energy is necessity for high resolution seismic exploration.
根据高分辨率地震勘探对高低频能量均衡的要求，对低截滤波进行了多次试验。
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