According to coupled wave theory, the volume hologram has a good property for light filtering and can be used as a kind of narrow-band filter.
根据耦合波理论，体积全息图有很好的滤光特性，可以作为一种窄带滤光片在实际中得到应用。
2
Two methods with which the long disturbance is removed from the digital are introduced: narrowband low - pass filtering canceling method and adaptive high - pass filtering method.
本文主要提出两种消除数字地震信号中长周期随机干扰的方法：窄带低通滤波对消法和自适应高通滤波法。
3
This paper analyzes the characteristics of the common NarrowBand Interference (NBI). A new approach for NBI suppression is proposed, which uses eigen-subspace based filtering on the echo data of SAR.