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How about terms like 'steepness lower' and 'steepness upper' to refer to the steepness of the lower and upper edges of the bands?
Maybe I'm totally off the mark here...
You're the second person saying this so it needs to be changed. But lower and upper... I wanted to change it, but then I thought - for me it would make sense that 'lower' is where the signal gets lowered, so the right side. So I find this term confusing as well. Any other ideas? Rising and Falling comes to mind but my logic might differ from other people's logic.
Hmm. I guess we are talking about the technical parameters /characteristics of a bandpass filter, right?
I think that you are referring to the lowering of level (amplitude) by a certain amount at a certain point at the band edges and this is why you don't like the term but in my mind the lower and upper edges relate to the band edge being on the lower or upper end of the filter's centre frequency...
I guess that it's also not necessarily just the right side of a bandpass filter where level gets 'lowered'. In a bandpass filter it would be 'lowered' at the upper and lower edges of the filter. To complicate matters, there appear to be a mix of filter types - I guess that the first filter is actually a low pass, the inbetween filters bandpass and the last filter a high pass?
Seeing as there is a fair amount of space available how about 'lower edge steepness' and 'upper edge steepness'?
I too am open for corrections or suggestions!