active notch filter的用法和样例：
- Thus a comb notch filter based new interference reduction method is proposed.
- To solve the problem of unbalance vibration of PMB,the recursive algorithm and the notch filter are studied.
- A wide passband notch filter is implemented by replacing the capacitor in the LC low-pass filter with one-port SAW resonator.
- At the switching node, the label or payload extraction can be realized simply through an optical bandpass or notch filter respectively.