带阻滤波器 Band-stop filter
（重定向自Band stop filter）
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 
Band stop filter
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Band-stop filter 带阻滤波器
（重定向自Band stop filter）
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).
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