The indicator was created by John Ehlers and described in his book "Cybernetic Analysis For Stocks And Futures", page 192. This is one of its many noise-cutting filters.
Ehlers3PoleButterworthFilterMT.png
The indicator was created by John Ehlers and described in his book "Cybernetic Analysis For Stocks And Futures", page 192. This is another noise canceling filter.
Ehlers2PoleButterworthFilterMT4.pngEhlers2PoleButterworthFilter.mq4