REW V5.17 Beta 10 smoothing bug - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 17 Old 09-30-16, 06:45 AM Thread Starter
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REW V5.17 Beta 10 smoothing bug

Hi John,

The smoothing controls are no longer working properly in REW V5.17 Beta 10.
- "Remove Smoothing" doesn't work, while "1/48 & 1/24" give the same "look" ( & that "look" seems to be some variation of smoothing values derived from between 1/12 > 1/24 ).

I can't say how long this problem has been present ( though back in May a transducer I measured was unexpectedly smoother looking compared to my expectations )..

They ( smoothing controls ) are working properly in REW V5.10 build 3618 ( which I have recently reinstalled to check out my suspicions ).

I'm running Windows 8.1 ( btw ).

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post #2 of 17 Old 09-30-16, 09:26 AM
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Re: REW V5.17 Beta 10 smoothing bug

I'm on Win 7 x64 and can't verify this. However, I do see one quirk. I have an MDAT file with two nominally identical measurements that were saved with all smoothing disabled. The frequency range of the measurements is 40 Hz - 200 Hz. If I enable 1 oct smoothing, it works okay, with a start frequency for the smoothed trace of about 56 Hz. Then I disable smoothing and the trace returns to the unsmoothed state with a start frequency of 40 Hz once again, just fine.

Now I set smoothing on one of the measurements to 1 oct, then save all measurements to MDAT. Then I close REW, open it back up, and open up the saved MDAT. If I take the measurement that was saved with 1 oct smoothing, and subsequently disable smoothing on it, the result is unsmoothed, but the start frequency of the unsmoothed data is now 56 Hz instead of the original 40 Hz. So it appears to have lost some of the data or bookkeeping information required to regenerate the full data set of the original unsmoothed data.

I've attached the project below.
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post #3 of 17 Old 10-01-16, 09:51 AM
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Re: REW V5.17 Beta 10 smoothing bug

I don't see that behaviour Earl, can you post an mdat that displays it and how you expect it to appear? Bear in mind that for measurements which are log spaced (96PPO) the minimum smoothing is 1/48, can see that in the Info panel. Measurements can be converted back to linear spacing by disabling the log spaced option in the Analysis preferences and re-applying the IR windows. 5.13 had some changes to smoothing, small improvements to the Gaussian approximation in the smoothing filters.
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post #4 of 17 Old 10-01-16, 10:03 AM
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Re: REW V5.17 Beta 10 smoothing bug

Looking at your issue Andy, as a workaround if you reapply the IR windows the correct start freq will be restored.
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post #5 of 17 Old 10-01-16, 01:21 PM
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Re: REW V5.17 Beta 10 smoothing bug

OK, fixed that for the next beta Andy. As an aside, pretty noisy looking mic cal file in that measurement, probably better off not using that.
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post #6 of 17 Old 10-01-16, 03:51 PM Thread Starter
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Re: REW V5.17 Beta 10 smoothing bug

Hi John,

Here's the mdat file as requested.

Here are 2 pics that demonstrate the smoothing discrepancies ( as displayed on this laptop ).

The first is a single trace from the Decay tab ( set to 1/48th smoothing ).



The second pic is from the SPL & Phase tab ( same trace ).



I'm running the latest graphics driver for this laptop ( maybe thats' the problem ).

FYI, this is an ancient ( 8yr old Dell ) machine . I am running Java 8 with an up-to-date Win 8.1 OS .

Attached Thumbnails
REW V5.17 Beta 10 smoothing bug-test_b-c900_me90_.png  

REW V5.17 Beta 10 smoothing bug-test2_b-c900_me90_.png  

Attached Files B+C_900_on_ME90.mdat (8.21 MB) 
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post #7 of 17 Old 10-01-16, 04:15 PM
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Re: REW V5.17 Beta 10 smoothing bug

Quote:
JohnM wrote: View Post
OK, fixed that for the next beta Andy. As an aside, pretty noisy looking mic cal file in that measurement, probably better off not using that.
Thanks! I've since gotten a new mic from Cross-Spectrum Labs, so the cal file should be a lot better. I guess some of those earlier Dayton EMM-6 cal files were questionable.
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post #8 of 17 Old 10-02-16, 04:19 AM
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Re: REW V5.17 Beta 10 smoothing bug

Hi Earl, the difference you are seeing is because the measurement has a frequency dependent window applied, which has its own smoothing effect. There isn't an option to use a frequency dependent window for the decay or waterfall plots (that's on my todo list), but the spectrogram has a wavelet mode which is produced using a frequency dependent window.
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post #9 of 17 Old 10-02-16, 08:16 AM Thread Starter
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Re: REW V5.17 Beta 10 smoothing bug

Quote:
JohnM wrote: View Post
Hi Earl, the difference you are seeing is because the measurement has a frequency dependent window applied, which has its own smoothing effect. There isn't an option to use a frequency dependent window for the decay or waterfall plots (that's on my todo list), but the spectrogram has a wavelet mode which is produced using a frequency dependent window.
Hi John,

I agree that the 2nd pic I posted looks to have had a FDW smoothing window applied to it ( but I'm not making that choice ).

Specifically ( since I find your response a bit ambiguous ) , how do I engage the smoothing option ( assuming it exists ) to make my second picture look like my first picture?

The thing is, I have already tried to get rid of any over-riding global smoothing within the "Analysis" tab ( plus I'm not aware that I ever choose to apply something like FDW ).
- I have unchecked every box within the Preference's Analysis tab ( to try to disengage any & all global smoothing choices , but to no avail ) closed that window, shut-down REW, rebooted & re-opened REW / all to no avail.
- FYI, I can select "Remove Smoothing" from the graph menu ( for any file ) and smoothing is definitely not removed.


I have chosen "Delete Preferences & ShutDown", then Uninstalled REW & ReInstalled REW 5.17 / but this doesn't clear up this situation ( I no longer have 5.10 installed / which was a temporary, exploratory measure ).

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post #10 of 17 Old 10-02-16, 08:30 AM
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Re: REW V5.17 Beta 10 smoothing bug

All the measurements in that file had a frequency dependent window, to remove it use the IR Windows dialog for each measurement and de-select it. Also check that frequency dependent window is not selected in the Impulse Response window defaults in the Analysis preferences.
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