In addition to have equal-ripple response in the passband, N-degree Chebyshev functions can have at most N-2 prescribed transmission zeros to improve the selectivity or group delay.

• N阶柴比雪夫多项式除了在通带内是等连波响应外，可以透过预先置入最多N-2个传输零点的方式，增加通带两侧的选择度或是通带内的相位线性度。