Jisho

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楕円
Wikipedia definition
1. Elliptic filterAn elliptic filter (also known as a Cauer filter, named after Wilhelm Cauer) is a signal processing filter with equalized ripple behavior in both the passband and the stopband. The amount of ripple in each band is independently adjustable, and no other filter of equal order can have a faster transition in gain between the passband and the stopband, for the given values of ripple (whether the ripple is equalized or not).
Read “Elliptic filter” on English Wikipedia
Read “楕円フィルタ” on Japanese Wikipedia
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