A new type electrically tunable bandpassfilter was designed, how to control the filter tuning by digital signal was investigated.
设计了一种新型电调谐带通滤波器，研究了数字信号控制滤波器电调谐的技术。
2
It proves by practising that this designing method of microstrip pectinate bandpassfilter and interlaced digital filter is simple and of good effect.
实验证明，用此方法设计微带线梳状带通滤波器及交指型滤波器，方法简单、效果优良。
3
These filters are designed by using the concept of wave digital lattice filter and by making use of a novel approximate transformation method for wide band bandpass filters.