中心频率(英: Center frequency) 是带通滤波器的较低的截止频率 与较高的截止频率 的算术平均数或者几何平均数。
以几何平均数定义:
以算术平均数定义:
带宽 如果足够的小,这两个定义是等价的。与此相关的参见Q値。
一般以几何平均值的定义用于仿真电路中。而以算术平均值的定义用于更广泛的领域。
英语百科
Center frequency 中心频率
In electrical engineering and telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies. It is usually defined as either the arithmetic mean or the geometric mean of the lower cutoff frequency and the upper cutoff frequency of a band-pass system or a band-stop system.