信号处理

以LC并联作例子:

L = 1mH（由于绕成电感的铜线附有电阻先假设它带有Rl = 2欧姆电阻），C = 10nf

这部份先不理会R2

L//C的共呜频率:

计算Xl（感抗）：

计算Q因子的值（Q因子就是带阻滤波器的峰值）：

计算等效阻抗:

等效阻抗就是当L跟C并联后所产生的阻抗

计算频带（bandwidth）:

bandwidth

Fo+3db

Fo-3db

In signal processing, a band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a specific range to very low levels. It is the opposite of a band-pass filter. A notch filter is a band-stop filter with a narrow stopband (high Q factor).