The influence of comb-filter effect produced by three points of fixed pickups to the sound reinforcement is discussed in the article, based on the analysis of the acoustic feedback about sound reinforcement system in multimedia classroom.

To the problem of interference and base-line excursion, this paper proposes an adaptive comb filter with Phase-Locked Loop(PLL), besides digital comb filters.

Based on principals of interference of acoustic waves and simplified digital delay-line,comb filter effect induced by superposition of reflections from steps is presented.

The transfer matrix method is used to study optical comb filter properties of one-dimensional multilayer photonic crystal.

The comb filtering effect which was caused by improper use of microphone during record and on-site sound amplifying was analyzed combined with acoustic theories of modern musi

Finite impulse response comb filter based on fractional delay;

The analysis for comb filter based on crystal birefringence;

A design method for comb filter is proposed,it is demonstrated that the traditional time domain averaging is just a special case of the general comb filter and its performance is influenced by the error of estimating period only.

Optimization calculation of interleaver made of cascade Mach-Zehnder fiber interferometer;

Interleaver Design Based on Phase Characteristics of Fabry-Perot Cavity;

Fabry-Perot etalon must be thermally stable when it is used to make interleaver.