stop band ripples vs stop band attenuation?

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ABTJ
ABTJ 2020-7-11
回答： Star Strider 2020-7-11
What is difference between stop band ripples and stop band attenuation?Please show/explain with matlab plot

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Star Strider
Star Strider 2020-7-11
For all intents and purposes, they are the same thing. In filters with stopband ripples, that parameter sets the stopband attenuation as well as the magnitude of ths stopband ripples. For other filers (e.g. Butterworth), it only specifies the stopband attenuation.

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