filter 濾波器

low-pass 低通
high-pass 高通
band-pass 帶通
band-stop 帶止/帶阻

passband 通帶/通頻帶
stopband 止帶/阻帶/抑制帶
transition band 過度帶/過渡頻帶

cutoff frequency 截止頻率

ripple 漣波

Matlab Filter Tools:

filterDesigner, sptool