prototype filter的用法和樣例：
例句
- An optimal design method for the prototype filter design of the filtered multitone modulation system is proposed.
摘要給出了濾波多音調製系統的原型濾波器優化設計方法。 - In our proposed method, both the objective function and the perfect reconstruction condition are expressed as a quadratic function of the prototype filter coefficient vector.
該方法中，目標函數和完全重構條件均被表示成為原型濾波器係數矢量的二次函數形式。
