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Is there a freeware alternative to APL TDA ?
Is there a freeware alternative to APL TDA ?
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Old 27th July 2017, 10:57 AM   #11
JohnPM is offline JohnPM  United Kingdom
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The pre peak data is already there, I just set the graph axes on the example to mirror the APL plot.
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Old 27th July 2017, 07:10 PM   #12
wesayso is offline wesayso  Netherlands
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I see, that's good to know. In APL_TDA I can move the graph by filling in a peak delay by filling in the time zero box (in ms). I assume in REW it is coupled to the start of the actual IR peak? I usually have the peak at t=0, never really tried to move the IR in time to see the pre peak data in a wavelet.
With a band pass phase like I have with my arrays part of the build up of the wave front falls outside the standard representation of the graph on the bottom end.
It shows as far as -8 ms of the pre peak, and if I adjust the limits to show (e.g. -25 ms) more of the pre peak area it just moves that graph up without filling in the missing parts (it does not regenerate the graph).
If I click the generate button again it just moves the graph back to the standard pre set -8 ms. I never tried to actually delay the IR peak (not having it on t=0), I figured I should be able to set wider time Limits to show me that pre peak part too. Am I interpreting this wrong?
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Old 27th July 2017, 07:30 PM   #13
JohnPM is offline JohnPM  United Kingdom
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The pre peak portion is 25% of the chosen range, so if you have a 30ms range there will be 7.5ms of data before the IR peak. With a 100ms range you get 25ms before the peak. The range that is processed is relative to the IR peak, so moving the peak will move the range correspondingly and you won't see more data. I could provide a separate control for the pre-peak portion, but it didn't seem a common use case to look very far into the 'past'.
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Old 27th July 2017, 11:27 PM   #14
wesayso is offline wesayso  Netherlands
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If this new feature gets more use as a timing tool it might be of interest to see more of that side of the peak (as it will show the build up part of the wave, especially for the lower frequencies. I know I've been using APL_TDA for that personally, as a verification of what I get and see in REW.
I've always checked all my processing with REW as a tool, but did find APL_TDA a useful additional tool to verify. Now that you found a way to present a very similar graph, it just might provide a similar service as a visual (timing) tool.

So if it is possible, I for one would really welcome it. I had always figured that's what the Limits option would/should have provided, it just didn't work that way.

I can only make a deep bow for you, constantly evolving and providing such cool useful new features to an already very versatile measurement program. Thanks very much for the open way of communication too. I really appreciate it.
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Old 29th July 2017, 11:20 PM   #15
JohnPM is offline JohnPM  United Kingdom
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I've put in separate controls for the before and after peak spans, should be more straightforward to use. I've also made some improvements to the shading algorithms for the 3D Enhancement feature, that helps things stand out.

2D.png

3D.jpg
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Old 29th July 2017, 11:51 PM   #16
wesayso is offline wesayso  Netherlands
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That sure helps!
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Old 30th July 2017, 01:15 PM   #17
BYRTT is offline BYRTT  Denmark
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Is there a freeware alternative to APL TDA ?
Can understand RobWells situation that for diy work few times a year its not worth it if cost is any close or higher than the student license offer, which by the way didn't know ran out.

Quote:
Originally Posted by JohnPM View Post
Took me a while to get around to it, but I have done a little work on that...
Thanks also for looking into that.
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Old 30th September 2017, 10:47 PM   #18
RobWells is offline RobWells  United Kingdom
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Did this update ever get released ? I've been regularly checking the AVnirvana site but the latest release on there is June 24th.
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Old 1st October 2017, 08:43 PM   #19
JohnPM is offline JohnPM  United Kingdom
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Yes, just posted it - spent the weekend updating the help files to get the release ready
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Old 1st October 2017, 09:14 PM   #20
BYRTT is offline BYRTT  Denmark
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Is there a freeware alternative to APL TDA ?
Quote:
Originally Posted by JohnPM View Post
Yes, just posted it - spent the weekend updating the help files to get the release ready

...that change list looks fantastic especially 88,2/96kHz sample rate using Java drivers
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