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This topic comprises 2 pages: 1 2
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Topic: D-2 Analyzer Now Available
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Michael Schaffer
"Where is the Boardwalk Hotel?"
![](http://www.film-tech.com/ubbmembers/1204d.jpg)
Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 07-11-2004 09:36 PM
There isn`t really that much information about what the software can do on the website. But I doubt it has anywhere near as many functions as the IE-33. Since the mux/mic package is the same you get when you buy the USL set, what is the point in having this system? I use the USL set with the IE-33. It has a ton of RTA functions including quick memory and extensive memory management, and all the extra stuff like the phase checker, signal generator, RMS voltage display, NC and NR. They promised RT60 will follow. It can also play homemade test signals when you store them as wav or mp3 file. Then there is the little scope function. OK, I discovered it has a little phase offset, but you can work around that if you know it is there. Still, there are so many things you can do spontaneously that you would need to set up a lot of other equipment to do, like quick analog a chain test, or look at the timecode shape when you have a DTS problem. I also used the strip chart function to track down a reel with bad timecode by recording the output of the reader rather than standing next to the projector and staring at the green light for 2 hours. Granted, there is a certain lag, but I guess the D2 system isn`t complete real time either since it`s PC based too.
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Michael Schaffer
"Where is the Boardwalk Hotel?"
![](http://www.film-tech.com/ubbmembers/1204d.jpg)
Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 07-12-2004 04:34 AM
What I do to keep the rta from bouncing all over the place is to average mic 1 for 10 seconds, then go to mic 2 for the same number of samples, and so on. I also once set up the mics all next to each other, and the response wasn`t really very different between them (it was, but like Steve said, not dramatically). I also store and look at the individual microphone curves, and subtract them from the curve of the microphone in "the best spot" to determine where there are problems caused by the room in certain places. I haven't had an opportunity yet to compare it directly to an R2 system. However, I think that is just as good, considering that the room isn't static anyway, and it depends on so many factors, like exactly where you put the mics, so there is no "perfect" measurement anyway.
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Michael Schaffer
"Where is the Boardwalk Hotel?"
![](http://www.film-tech.com/ubbmembers/1204d.jpg)
Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 07-13-2004 07:18 PM
I think I worded this unclearly: I didn't mean one sample every 10-15 seconds, I meant 10 seconds of averaging, then switching to the next mic. The IE-33 takes about 10 samples per second. Or maybe I should say it "polls" to avoid confusion with samples as in a/d conversion. The sampling rate of the a/d converter is obviously much higher. That's what I meant in my question to Mark, the polling rate, the number of samples which go into the complete picture. Anyway, in averaging mode, the IE-33 still takes about 2 samples per second, so you get 20-30 samples per mic which I think is enough to give you a good overall picture. Yes, the display bounces when you switch, but it settles quickly, and at the end you have averaged readings from all 4 microphones resulting from 80 readings. To determine whether the level difference and the switching bounce spoil the result, I tested the method by reading each microphone separatley for 30 seconds, storing the result and clearing the display before going on to the next. Then I subtracted the 4 resultant curves from each other. Finally, I repeated the "live" switching and compared the result to this curve. There was no difference worth mentioning. I also repeated the test under "laboratory" conditions with a file of pink noise suddenly raising in 3dB steps every 10 seconds. BTW, how well does the Dolby mux work?
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