Ehlers Super Passband Filter

As someone hidden my old script that is just what one guy copied from a book from John Ehlers. I rewrite what i read in the book.
I also found this. So i rewrite this to the guys that was using it. If it hiddes again i will just keep it to myself and downgrade my plan in this TV
// Ehlers Super Passband Filter script may be freely distributed under the MIT license.
// Ehlers Super Passband Filter script may be freely distributed under the MIT license.
// Ehlers Super Passband Filter script may be freely distributed under the MIT license.
// Ehlers Super Passband Filter script may be freely distributed under the MIT license.
// Ehlers Super Passband Filter script may be freely distributed under the MIT license.

I wrote 5 times to be clear. If you guys dont understand portuguese go to the translator to understand what i am explaining in // inside the code.