REW Beta Release V5.20 beta 29

John Mulcahy

REW Author
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Apr 3, 2017
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2,290
There is something of a "live preview" theme to the V5.20 beta 29 release.

Firstly, the trace arithmetic parametric sum operation has been replaced by a more general "Alignment tool", which allows the gains, delays and polarities of two measurements to be adjusted while giving a preview of the SPL and phase of their sum. It makes most sense for this to be used with measurements that have been made with a timing reference, so the relative delays are meaningful. New responses can be generated from either of the aligned measurements or their sum by clicking the appropriate button.

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The live preview theme continues with the addition of t=0 offset adjustment dialogs for the SPL & Phase, Impulse and Group Delay graphs. In each case a live preview of the effect the adjustment of the zero time will have on phase is shown.

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The impulse graph also gets a new way of adjusting the impulse response windows, with indicators at the top of the graph showing the window reference position and the left and right window extents. Those indicators can be clicked and dragged to adjust the windows, with a live preview of the effect the change will have on the SPL response. Changes are applied when the mouse button is released.

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The final live preview feature is for the effect of clock adjustments on the impulse response, again with a preview of the adjusted impulse and the effect on phase. Clock adjustment is fairly computationally intensive, so the previews are not as responsive as for the other dialogs.

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This release also has noise criteria figures for the RTA, shown when the RTA is in one octave mode. The criteria available are Preferred Noise Criterion (PNC), Balanced Noise Criterion (NCB), Noise Criterion (NC) and Noise Rating (NR). The corresponding noise criteria curves can also be shown as an overlay on the graph. Note that self-noise of the microphone and its preamp will often be a limiting factor for noise criteria measurements.

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Other changes in the release are:
  • A button has been added in the SPL & Phase graph to invert polarity
  • The control to normalise to a defined peak SPL has been moved from the Impulse graph to the SPL & Phase graph
  • The "New" and "Avg" icons in the All SPL graph legend have been removed
  • A menu entry has been added to export all impulse responses as text
  • Bug fix: An exception could occur when checking levels
  • Bug fix: Phase plots did not show data points when that option was selected
  • Bug fix: NPE when applying clock rate adjustments to imported sweep recordings
 

tankm

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Joined
Jun 6, 2019
Messages
7
Hi,
V5.20 beta 29
- Under "SPL & Phase" Controls, the "Add to Data" button is grey out for Measurement generated by "Average".
- Under "All SPL" Controls. Press "Align IR Start", it's now grey out. "Save All" and "Remove All" data. Load new measurements. "Align IR Start" is still grey out. Only way is to fully close REW and restart. This is now a new problem for this beta, happens in previous beta too.

Regards and Thanks for the great software.
 

John Mulcahy

REW Author
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Joined
Apr 3, 2017
Messages
2,290
- Under "SPL & Phase" Controls, the "Add to Data" button is grey out for Measurement generated by "Average".
- Under "All SPL" Controls. Press "Align IR Start", it's now grey out.
Thanks, I have fixed those for the next build.
 

jtalden

Active Member
Joined
May 22, 2017
Messages
197
Location
Arizona, USA
My AV System  
Preamp, Processor or Receiver
Marantz AV7705 Pre/Pro
Main Amp
Rotel RMB-1066 6 chnl P-amp x 2
Additional Amp
Behringer DCX2496 x 2
Universal / Blu-ray / CD Player
OPPO BDP-103 Universal Player
Front Speakers
DIY SEAS H1456/H1212 Spkr x 5
Subwoofers
DIY JBL 2235H 15" SW x 2
Video Display Device
JVC DLA-X790R
Screen
Da-Lite Da-Snap 39105V - 92"
John,
1. In the screen grab below the alignment tool signs are all negative for the offsets. The signs are all positive in the measurement panel notes. I assume these should agree? If we are thinking in terms of the needed REW zero shift I think the adjustment would be +7.037 ms and the distance would also be positive to have that same effect on the zero shift.

[Also note the negative sign in the tool for ft-in falls outside the parentheses.]

Comment:
It is confusing to me as I think in terms of what physical adjustment is needed to the audio system settings. In this example the actual delay change needed in a MiniDSP device is -7.37 ms. That is 7.37 ms less delay. If that adjustment was instead to be done in a receiver the distance would need to be +2.535 m.

I assume others will also be confused when making a physical adjustment to their system. I don't know a good way to address this issue. Possibly there could be something in the help that would help with this confusion? - just a thought. We will eventually get it right.

2. I use loopback timing and thus there is significant delay offset from zero depending on the buffer size and mic distance. 'Offset t=0' in the impulse chart will not allow impulse offsets greater than 10 ms even entered into the input field. The offset applied will be 10 ms instead of the larger number entered. Occasionally I need to shift zero a specific distance larger than 10. Can input field value made to accept larger numbers? The ±10 ms slider range is not a concern to me as I will only be entering specific changes.

27172
 

John Mulcahy

REW Author
Thread Starter
Joined
Apr 3, 2017
Messages
2,290
1. In the screen grab below the alignment tool signs are all negative for the offsets. The signs are all positive in the measurement panel notes. I assume these should agree?
Yes, they should agree, the notes have the wrong sign. I'll fix that.

If we are thinking in terms of the needed REW zero shift I think the adjustment would be +7.037 ms and the distance would also be positive to have that same effect on the zero shift.
t=0 moves opposite to delay. If a measurement is delayed, so the IR peak appears later on the time axis, the t=0 point must necessarily be earlier.

[Also note the negative sign in the tool for ft-in falls outside the parentheses.]
That is to avoid having to put a sign in front of the feet and inch figures individually

2. I use loopback timing and thus there is significant delay offset from zero depending on the buffer size and mic distance. 'Offset t=0' in the impulse chart will not allow impulse offsets greater than 10 ms even entered into the input field.
Decoupling the field and the slider would be difficult to manage. If "Apply" is clicked with 10 ms of delay further delays can then be entered. A better way to deal with loopback timing offsets is to use the timing offset control on the Measure dialog.
 

jtalden

Active Member
Joined
May 22, 2017
Messages
197
Location
Arizona, USA
My AV System  
Preamp, Processor or Receiver
Marantz AV7705 Pre/Pro
Main Amp
Rotel RMB-1066 6 chnl P-amp x 2
Additional Amp
Behringer DCX2496 x 2
Universal / Blu-ray / CD Player
OPPO BDP-103 Universal Player
Front Speakers
DIY SEAS H1456/H1212 Spkr x 5
Subwoofers
DIY JBL 2235H 15" SW x 2
Video Display Device
JVC DLA-X790R
Screen
Da-Lite Da-Snap 39105V - 92"
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