adaptive electric filter的用法和样例：
- In this paper, the problem of the signal extension about frequency band of electric filter in accurate rescontructure/reappearance was studied.
- Research on the Corona Electric Field Characteristics in Electric Filters and on Optimization or the Poles.
- Principle and Application of Wet Electric Filter
- Testing and Analysis of Electric Filter
- The amplitude of the signal was modulated in our system and thelow frequency background noise isolated by an electrical filter.