waterfall decay problem

[jpv]

I have noticed that the decay on the waterfall graph with the 4.11 version looks stange.
The problem I have is the first 11 slices 100ms look flat and then start to drop off. With the older version the roll off started with the second slice. I am looking at old measurements and did not make any new ones tocompare. Is it a problem with using old data or am I doing something wrong?

[JohnM]

The impulse response start time on V4.11 is shifted back to the first point the response gets within 20dB of the peak rather than being at the peak. This means that the window for the waterfall starts correspondingly further back in time and it takes a few slices before the back edge of the window passes the peak and you see the decay happening. You can manually adjust the start time using the impulse response window control to place zero at the peak to get behaviour like V4.10. I'll look at adjusting the trailing part of the window for the next release.