The Maillard Reaction
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post edited by The Maillard Reaction - 2019/01/09 15:09:17
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Rbh
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RE: null test; best way? easiest way? most exact way? analysis reports?
2009/06/01 23:26:47
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Mike, I haven't run many null tests, but I would assume if it's track data you want to test then seems like the fastest/easiest way would be to clone the track and simply invert the phase on one or the other. Not sure about the bestest way though.
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The Maillard Reaction
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post edited by The Maillard Reaction - 2019/01/09 15:09:24
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tarsier
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RE: null test; best way? easiest way? most exact way? analysis reports?
2009/06/02 09:23:15
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My method of 'null' testing is to export the two sound files that I want to test out of Sonar, then load them into Adobe Audition. I then copy one of the files and do Audition's "mix paste" onto the other file with the "invert" option. (probably most audio editors have some sort of "paste inverted" function to do this.) Then I zoom vertically so I can see where any non-nulls are, and I can jump to those spots and listen. Audition also has a wide variety of analysis tools you could run on the result: amplitude, phase, spectrum, that sort of stuff. Or just with Sonar, along the lines of what Rbh said, you could load the two sound files into two Sonar tracks, invert one of them and play them to listen for the non-null parts. Or with Sonar again, have the two files, do a Process->Audio->Gain on one of them with the italic phi button selected on each channel and the gains set appropriately, then bounce those two down to a new track.
post edited by tarsier - 2009/06/02 09:34:41
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DaveClark
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RE: null test; best way? easiest way? most exact way? analysis reports?
2009/06/02 10:06:11
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Hi Mike, Although for most folks I concur with the prior posts, I myself use my own utilities because I know it'll be right  . I'm curious, however, about what kind of analysis you're looking for because that might be a future programming exercise. Best regards, Dave Clark
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The Maillard Reaction
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post edited by The Maillard Reaction - 2019/01/09 15:09:34
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The Maillard Reaction
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post edited by The Maillard Reaction - 2019/01/09 15:09:42
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The Maillard Reaction
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post edited by The Maillard Reaction - 2019/01/09 15:09:51
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Psalmist35
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RE: null test; best way? easiest way? most exact way? analysis reports?
2009/06/02 12:41:39
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Mike,
I appologize if I'm hijacking your thread. I am curious about this subject but do not understand the benifits of doing the null test. I do understan what null-ing two tracks does but what does one do with the resulting information? Under the circumstances of your test what does it indicte to you? Is this for mixing or mastering? Thanks for allowing me to ask. Hope anyone can enlighten me as I'm sure this is a very compilcated subject.
Rich
George Foreman Grill; Ginsu knifes; Clapper; Home Grown Intel i7 -6700K 16G Ram; Sonar Platinum; MOTU 896HD; Tascam US2400;
My Music
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The Maillard Reaction
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post edited by The Maillard Reaction - 2019/01/09 15:10:00
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tarsier
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RE: null test; best way? easiest way? most exact way? analysis reports?
2009/06/03 10:43:21
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ORIGINAL: mike_mccue
Audition has built in Analysis. I got to view phase, frequency and amplitude today using Audition.
It still seems like a good candidate for a mini app.
I'm still waiting for a frequency vs. phase display. How come no one has developed that one? Not the phase display like Audition has where it shows the phase differences between the channels. I want the phase info that usually gets thrown away when you do a fourier transform to get the frequency spectrum.
I'm a big advocate of the "trust your ears" method but I am fascinated that there is a potential to monitor digital streams in a way that was impractical or impossible with previous technologies. I just want to continue to learn stuff... lately I've been fascinated with all the types of metering etc.
Yeah, trust your ears, but it's also a good idea to understand the ways your ears can be fooled. That's where good scopes of various kinds are valuable. And considering how easy it is to fool your ears, I'm not sure how good of an idea it is to trust your ears. Trust but verify. 
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slartabartfast
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RE: null test; best way? easiest way? most exact way? analysis reports?
2009/06/03 11:06:51
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In this specific case it allows me to know that I can disregard exploring potential tweaks on this one parameter. It's a sad commentary on the quality of documentation for audio apps, that we have to do testing and reverse-engineering to find out what they actually do.
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