Pink Noise and 3D

  • Thread starter Thread starter CoolCat
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CoolCat

CoolCat

Well-known member
Having some trouble doing a RTA with this "audio dock"....tried like 3 different softwares and wound up only getting this strange 3-d graph?

here's the scoop........

1) I played a Pink Noise file, thru the Monitors.
SSSSHSHSHSHSHSHSHSHHSHSHSHSHSHSHHS
SSSSHSSSSSSSSSSSSSSSSSSSSSSSSSSHHHH
SSSSSSSSSSSHHHHHHHHHHSSSSSSSSSSHSHHS

2) I had the Measurement Mic plugged into the audio interface, set volume to below clipping levels. Set record levels in software below clipping, and then hit RECORD on the Software-Studio Recorder which then created a WAVE file. (approx 5 seconds)

So at this point I could playback this short recorded WAVE file...of...
SSSHSHSHSHSHSHHHHHHHHHSHSHSHSHSHSHSS
SSSSSSSSSSSSHHHHHHHHSSSSSSSSSSSSSSSHH
SSSSSSSSSSSSHHHHHHHHHHHHHHHHHHSSSSSSSS


3) I then loaded this wave sample into WAVE Lite software. At 24/48K
Again I could playback the SSSSSSHHHHHH sample.
By highlighting the waveform and selecting "3-D Spectrum Analysis"
the picture/graph below was obtained.

?????????????????????
but there's no DB reading? it has the Frequency range and the right side of the picture is TIME (millseconds)...which has me confused. Is there other software that can give me a normal Freq vs. Db graph from a Wave file?

I'm about ready to go back to using a hand held Radio Shack meter and a pencil and pad and plotting perfectly, precision points pertaining possibly to playback programs professionally perceived as pliable plots. pissed. :confused:
 

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Have you tried RoomEQ?

I've been building some bass traps and am going to do some testing with a Klark-Teknick measurement mic to see where best to put'em..I haven't used this yet but it looks like exactly what you want!


http://www.hometheatershack.com/roomeq/
 
Thanks,
I had that downloaded first but couldn't get my input working?
still have it ready to run.

The output is fine, but when I switch to input nada.

I have an EMU, thru Patchmix, thru the PC...so somewhere in the loop, whatever the mics picking up, is getting lost.

I did show a response on the EMU and Patchmix(EMU1820 software)...but didn't show up in the ROOMEQ (Input)...

looks like a good software once its working.
 
I think instead of playing pink noise maybe you could just play a cd and record that...listen to the playback and you'll hear any problems...just a guess.
 
Actually you should be using a sine wave in sweep mode. That way you can get the impulse to get a proper RT reading. If the software doesn't have a device loop correction algo(loop), the results may be skewed. I dumped RoomEq because of that. Well it could work with some crappy unbalanced cables and adapter crap city. But the I'm on a MAc ,and the JAVA runtime has a lack of support, so I could'nt even do the plots in 24 bit reso-- not worth it. I couldn't use roomEq w/ my DAW interface.

with Fuzzmeasure I can do as many as I want, and even check each channels response, let alone the rooms response. Even has a mic calibration module.

:D

But you'll figure it out, sorry I can't give you any help. The capture settings can make a world of a diffence too, so when you get it going you need to tweek, before making any treatment changes.
The monitoring set up takes quite a time to get right too.

T
 
Just noticed there is no dB reading at all? what settings you have for the waterfall time domain? 1.5 seconds?
 
Should look more like this:


The time domain is @ 300ms, and no that is not my current set up. I just grabbed the first thing I could find. Thats the before response LOL :D
 
1tonio said:
Should look more like this:


The time domain is @ 300ms, and no that is not my current set up. I just grabbed the first thing I could find. Thats the before response LOL :D
Click to expand...



From that, it tells me that you've got a fairly big problem, at the mic position (which i'm assuming is your mix position), between 60 and 100hz-ish.

You're also getting "ringing" at around 170 and 250hz, and loads of low-end build-up at particularly at 30hz, but also generally in the 20-70hz region.
 
Hey Thanks MD, but if you actually read underneath the cool looking waterfall plot, you will see that I said its not my current set up. After treatment its been fixed, and the dips are almost gone. The 35 hz area is the onset of the monitors. and from what Iv;e seen, all plots will show the onset as a peak.

Heres the current plot
 
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