The Delta value (0.05 .. 1) determines the filter width; at Delta = 0.1, cycles outside a 30% range centered at TimePeriod are attenuated with > 3 db.
This is definitely better then nothing. However, it's still not clear how delta affects the results. What will be the % range and attenuation strength with Delta=0.3 or 0.5 and so on. It's difficult and risky to use the filter if you don't understand it. Right?
Please, consider 2 ideas:
- Add comprehensive description of Delta.
- Code an original Ehlers' bandpass filter. The link to a pseudo code can be found in my first post. I believe it would be useful not only for me.
JCL, what do you think?
