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    Galactic Wanderer

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  1. Hear what you expect to hear, is more like it: https://www.eurekalert.org/news-releases/609045
  2. You can save your current settings into a file to be loaded back later (File -> Settings -> Save... menu). Then, go to Settings screen and click on the red "X" near the top to reset settings to default.
  3. Generally, the larger the size of the filter, the greater and sharper the attenuation in the transition band. Just use DW defaults (Kaiser, 256k) if you are not sure. That was chosen for a reason. Hope you realize it, Frank, but DeltaWave is my playground :) I add tons of settings to play with, like the 8M and 16M tap FIR filters in the latest version, and a new IIR filter -- as I think of new things, I'll add them as well. And yes, tons of different FFT windows that I've experimented with to learn how they affect the process. FFT Windows are not used in filtering, but they are used in creating the FIR filter, which DeltaWave does on the fly. The window choice affects filter quality, regardless of size you chose.
  4. Frank, Hann is an OK window for measurements, but not for quality DSP. Kaiser is the default in DeltaWave. I included many other windows there for testing so I and others can see what they do, including rectangular, triangular, etc. This doesn't mean every combination of FFT sizes and FFT windows will work. Hann-constructed FIR filters don't reject out of band anywhere close to the way Kaiser does, and have a lot more ripple. DW provides a tool for those interested in exploring different windows: Here's Kaiser 64k window: And here's Hann 64k (an 8k Hann will be much worse): Here's what a much smaller-sized Hann window looks like (from another site):
  5. Not sure what you're saying, Frank. I don't see the glitch with any setting I try, so I'm not sure what's causing it in your case. Small sized Hann window is just not the best choice for creating a FIR filter if you want the best filter with best rejection characteristics.
  6. If you don't let the previous update finish, the new one will be ignored. That's the downside of multithreaded, asynchronous processing in DeltaWave. If anything in the UI is changed while it's still working on something, it'll simply stop the background process and not process your new request. The suggestion is to let it finish and not interrupt :) You can always press the Apply button if your last update didn't get processed.
  7. dB toggle does automatically refresh, but if you click fast enough (or while there is still some processing going on to display the previous request), it will be ignored, as it just interrupts whatever was processing before. This jump looks a bit curious, and I can't reproduce it here with regular settings. What processing did you have enabled in settings? Can you try applying the same filter @end instead of start? And can you try a larger and better FFT window, such as 64k Kaiser instead of 8k Hann?
  8. A quick update to DeltaWave version 2.0.1: Changes in 2.0.1 Fix: regression issue with color scaling of delta spectrograms ( @fas42 ) Changed: IIR filter replaced with the maximally flat in passband Butterworth version Fix: FIR filter could previously cause a small error near DC frequency Added: additional filter sizes (8M and 16M taps)
  9. Hi Frank, Yes, the delta spectrogram was scaled incorrectly in that version. I found the issue and fixed it, but have other things I was waiting to finish before publishing an update. I'll try to get this out ASAP.
  10. Here’s a suggestion for next time: get someone in the field of conducting sensory experiments to design and approve the test plan before you start. There are a few such experts here and some on ASR. An objective test doesn’t have to use perfect equipment but equipment must be tested and measured before the test so that there are no questions about what happened afterwards.
  11. Where is the recording showing that the glitch didn’t occur in the listening chain? All I see is your assurances. There are a number of recordings that show the glitch and another number that don’t. Mani, you are not going to solve the problem by arguing about it. There were flaws in the test, and this is just one of them.
  12. Yes. No. Maybe. The problem is we don’t know. It requires speculation instead of actual objective findings.
  13. No. The chart shows an average, not an instantaneous value.
  14. Mani, this is not the point. In an objective test, the results of the test and the procedure is what counts. Assurances, no matter how certain you are, are not valid, unless they can be confirmed by objective means.
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