The oblique sounding is one of the powerful tools, by which an oblique ionogram is obtained with the group path or time delay against operating frequency.
斜向探测是电离层探测的主要方式之一，它能够获得电波传播群时延和频率关系的电离图。
2
The amplitude frequency response and groupdelay response of SAW TVIF filters have been measured.
并测试了其幅频特性和群延迟特性。
3
The sample rate, filter corner frequency, settling time, groupdelay and output word rate will be reduced also, as these are proportional to the external clock frequency.