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Comb filter can eliminate a periodic noise.
When frequencies of a periodic noise are identical to one of a desired signal, the extracted desired signal is deteriorated. |  |
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To avoid the deterioration of the desired signal, we have to adjust the frequency response of the comb-filter.
We have proposed a comb-filter with adjustable gain. |  |
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Design examples of the proposed comb-filter are shown in the figures.
The proposed comb-filter is useful for many applications which require to remove periodic noises. |  |