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71
Electroacoustics Toolbox / Channel Labels - Input Output or Analysis
« Last post by BillTLE on October 08, 2014, 12:37:06 PM »
When an FFT File is saved using the "export data button" the resultant file is sometimes shown as Input 1.txt, sometimes as Output 1.txt, and sometimes as Analyzer 1.txt.

I can see that the Channel selection is shown when the "Live Input" tab is selected for the Controls Drawer, but cannot see how to change between the three modes, or even if it matters.

The results seem to be the same, but perhaps I am missing something.

I tried to search in the on line "help" and in the "Forums" but am drawing a blank.

Am I missing something, or should I be bothered by the difference in file names?

Thanks,

Bill
72
IOScope / Re: Feature suggestions
« Last post by aprada on May 16, 2014, 06:16:55 PM »
Apparently no one reads or replies
73
RoomScope / Re: Interrupted Pink Noise
« Last post by FaberAST on March 31, 2014, 10:26:55 AM »
The interrupted noise method is not currently supported, although it may be added as an option in a future update.
74
SoundMeter / Re: Data Logging
« Last post by FaberAST on March 27, 2014, 02:05:42 PM »
Data logging is coming within the next few weeks...
75
SoundMeter / Data Logging
« Last post by Ferglets on March 26, 2014, 05:23:05 PM »
A couple of years ago you mentioned that a data logging feature may be coming to iOS versions of this product.  I'm still interested!
76
RoomScope / Interrupted Pink Noise
« Last post by noolah32 on March 22, 2014, 06:08:16 PM »
Hi, was wondering is it possible to perform reverberation tests using the interrupted pink noise method.

Thanks
77
Hi Ben,

Thanks for the response. Yes the tutorial I was referring to is the one you included a link to. I think I now understand the use of the SignalGenerator sweep as per your instructions. I will try this out.

When you say the Dual FFT Analyser is better for frequency response measurements, can you explain to me what it does that makes it better?

Thanks for the advice to date. Much appreciated!

Regards
Richard
78
Richard,

Are you referring to the tutorial on the blog (http://blog.faberacoustical.com/2013/mac/frequency-response-measurement-with-signalscope-pro-3-mac/)?

Quote
Every time I try to follow the instructions the FFT only shows me what is happening at that precise moment, not the full result of the frequency sweep from 20 Hz to 20 KHz.
If you follow the tutorial, you will have the sweep set to repeat. You will also have the sweep length configured to match the FFT. If either of these is not configured as indicated in the tutorial, then you won't see a stable frequency response magnitude trace in the FFT analyzer. Additionally, the FFT analyzer will need to be using a Uniform (rectangular) data window.

Frequency response measurements are much easier, more reliable, and more precise when you use the Dual FFT Analyzer tool in Electroacoustics Toolbox. The Dual FFT tool will also give you phase, group delay, coherence, impulse response, and cross-correlation data.

Ben
79
SignalScope Pro / Frequency Response Measurement using Signal Scope Pro for Mac
« Last post by rbashley on March 11, 2014, 02:46:12 AM »
I am attempting to use Signal Scope Pro for Mac to perform frequency response tests for a Hi-Fi Speaker and Subwoofer system. The equipment I am using is as follows:

Microphone: Rode NT2000 Professional Studio Condenser Mic (this has a pretty flat response down to 20 Hz with a slight lift around the 10 KHz)

Audio Interface: Apogee Duet (features a microphone pre-amp with 48V phantom power)

Computer: Mac Pro running Mavericks

Signal Source: Test CD with 20 Hz to 20 KHz sweep test tone

I can achieve a frequency response using the 1/3 Octave Analyser and peak hold function. However, I would like to use the FFT Analyser to provide more detail on frequencies. I have read the tutorial on how to do this but cannot find the way to create a frequency trace which draws the whole response (and remains) on screen. The tutorial shows a completed frequency response for an interface. Every time I try to follow the instructions the FFT only shows me what is happening at that precise moment, not the full result of the frequency sweep from 20 Hz to 20 KHz.

Am I doing something wrong? I cannot seem to find any way to recreate the frequency response graph as shown in the tutorial. I have also tried using the Signal Generator function to provide the Test Tone sweep but this makes no difference.

I am aware of the limitations of measuring in a room and the effect it has on response. I have a room that has been professionally acoustically treated with absorption and bass traps so I have a good understanding of acoustics.

Regards
Richard
80
Electroacoustics Toolbox / Re: Room Analyzer - best practice?
« Last post by FaberAST on February 07, 2014, 05:28:43 PM »
Quote
I'm not sure I know what you mean by "waiting for the analysis to complete (and stop on its own). Once I start the Dual FFT, it just runs. The excitation signal continues until I stop the tool. I did let it run for two minutes before stopping it. Should I wait longer? Seems like 10 repeats should happen much more quickly.

At which point do I click on "Capture Data?" While the excitation is running? After I stop the tool? I've tried both and I'm just getting an empty graph.

If you set the averaging type to Linear, the measurement will stop after the specified number of averages has been reached. I would recommend capturing the data after that.

Your screenshots clearly indicate that you are not yet getting valid measurements within the DFFT Analyzer, so that issue needs to be resolved before worrying about bad results from the Room Analyzer.

Ben
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