Frequency response measurements in numerical Freq, Db list form?

[jdclark]

I have seen Frequency response data taken in a long list form before:

50hz -- 85 DB
55hz -- 84db
etc
etc...

Which programs can output data in this format? (text file, excel file, doesnt matter so long as I can copy and paste it). The only one I can find is CLIO, and its generally not a good sign when you cant even find a price listed anywhere...... All programs that can create an FR graph can do it, it just depends if the designers gave it the option to output the data in point form rather than just graphical form.

I may have a contribution to make if I can get a hold on this part :)

[curt_c]

Do you mean like this?

Freq Mag Phase
20.12 59.5 -179.0
20.30 59.4 -179.7
20.49 59.4 179.7
20.68 59.3 179.1
20.87 59.3 178.5
21.07 59.2 177.9
21.26 59.2 177.3
21.46 59.1 176.7
21.66 59.1 176.1
21.86 59.0 175.6
22.06 59.0 175.0
22.26 59.0 174.5
22.47 58.9 173.9
22.68 58.9 173.4
22.89 58.8 172.9
23.10 58.8 172.4
23.32 58.8 172.0
23.53 58.7 171.5
23.75 58.7 171.1

[jdclark]

yep

[Jeff B.]

yep

You can check the link below.

[jdclark]

You can check the link below.

Unless I am missing something, I was under the impression all your programs were simulation based. Looking to get this data from an actual dataset taken with a mic.

[neildavis]

Unless I am missing something, I was under the impression all your programs were simulation based. Looking to get this data from an actual dataset taken with a mic.

This data, which is measured using a program such as CLIO or ARTA or several other apps, is what is used as the input for the crossover simulation. The PCD program reads these data files, converts them to 500-sample arrays, and then uses the crossover response to model the output phase and amplitude for the system.

There have been a couple of attempts to develop databases of Thiele-Small parameters for drivers (see http://thielesmall.com), but as far as I know no one has attempted a database of driver frequency and impedance measurements. There are many measurement files of differing quality on various web sites, but there is no database that a program like PCD can connect to.

I started looking at how to set up such a database but didn't get very far. If you are thinking that a measurement database would be useful, I wholeheartedly agree. Both Jeff and I have parsing routines for this data and we have or could come up with some client tools to process and visualize the data. A web-based service for retrieving measurement data and TS parameters would be most cool.

[jdclark]

This data, which is measured using a program such as CLIO or ARTA or several other apps, is what is used as the input for the crossover simulation. The PCD program reads these data files, converts them to 500-sample arrays, and then uses the crossover response to model the output phase and amplitude for the system.

There have been a couple of attempts to develop databases of Thiele-Small parameters for drivers (see http://thielesmall.com), but as far as I know no one has attempted a database of driver frequency and impedance measurements. There are many measurement files of differing quality on various web sites, but there is no database that a program like PCD can connect to.

I started looking at how to set up such a database but didn't get very far. If you are thinking that a measurement database would be useful, I wholeheartedly agree. Both Jeff and I have parsing routines for this data and we have or could come up with some client tools to process and visualize the data. A web-based service for retrieving measurement data and TS parameters would be most cool.

Not the reason I want the data in that format, but it does sound like an awesome idea :D.

I have the ARTA demo and love it thus far, however you can not save in the demo version. May have to make the investment before long.

[Jeff B.]

Unless I am missing something, I was under the impression all your programs were simulation based. Looking to get this data from an actual dataset taken with a mic.


I have seen Frequency response data taken in a long list form before:

50hz -- 85 DB
55hz -- 84db
etc
etc...

Which programs can output data in this format? (text file, excel file, doesnt matter so long as I can copy and paste it). The only one I can find is CLIO, and its generally not a good sign when you cant even find a price listed anywhere...... All programs that can create an FR graph can do it, it just depends if the designers gave it the option to output the data in point form rather than just graphical form.

I may have a contribution to make if I can get a hold on this part

Sorry, you just asked what program could output in that format - not which ones created it using a mic. My Response Modeler is designed to allow someone to simulate a response, or import one to modify (like extend or splices the bass response to it) and then save it as an frd file for use in PCD or any other crossover program for that matter.

Jeff

[johnk...]

I have seen Frequency response data taken in a long list form before:

50hz -- 85 DB
55hz -- 84db
etc
etc...

Which programs can output data in this format? (text file, excel file, doesnt matter so long as I can copy and paste it). The only one I can find is CLIO, and its generally not a good sign when you cant even find a price listed anywhere...... All programs that can create an FR graph can do it, it just depends if the designers gave it the option to output the data in point form rather than just graphical form.

I may have a contribution to make if I can get a hold on this part :)


I really don't completely understand your question as all measurement software creates data files that is basically in that format. Some Simulation/Design codes, such as SoundEasy can also dump ploted response data into a file of that format. It might help if you indicated what the application you require this for is.

[jdclark]

There isnt one, as odd as that sounds.

I meant to say that I already understood that all measurement applications have data in this format internaly, but apparently I did a pretty poor job with phrasing yesterday.

I just need to know what programs will let me GET THE DATA OUT in this format without doing it manualy per the graph.

[Dennis H]

I have the ARTA demo and love it thus far, however you can not save in the demo version. The demo version won't save files in the native binary format but it will still EXPORT .txt and .csv files. From the frequency response window, File / Export. Whatever options you apply to the graph -- smoothing, show phase, etc. -- will apply to the text files too.

[jdclark]

The demo version won't save files in the native binary format but it will still EXPORT .txt and .csv files. From the frequency response window, File / Export. Whatever options you apply to the graph -- smoothing, show phase, etc. -- will apply to the text files too.

Thank you! Finally, exactly what I was looking for.

Im just a beginner with all of this, how much smoothing is appropriate for what conditions? When I took my first measurments there were some irregularities caused from way too much ambient noise, and although I would never use those measurements for anything, I felt like 1/3oct was more accurate than 1/12; where as had there been less ambient noise 1/6 might have been better.

How does this sound?

[Dennis H]

I'm still learning ARTA too. It seems like the best way to deal with ambient noise is to use the Periodic Noise - Pink signal generator to record the impulse response. You can set it to average 10 or more signals so the ambient noise tends to cancel itself out. Somewhere in the manual, he discusses the advantages and disadvantages of the MLS, Sweep and Periodic Noise generators for the impulse response. Short version, he doesn't like MLS much, sweeps are best if there isn't any ambient noise, and PN is best if there is noise.

[jdclark]

I'm still learning ARTA too. It seems like the best way to deal with ambient noise is to use the Periodic Noise - Pink signal generator to record the impulse response. You can set it to average 10 or more signals so the ambient noise tends to cancel itself out. Somewhere in the manual, he discusses the advantages and disadvantages of the MLS, Sweep and Periodic Noise generators for the impulse response. Short version, he doesn't like MLS much, sweeps are best if there isn't any ambient noise, and PN is best if there is noise.


Thats what ive gathered thus far, didnt know about the averaging part though, are those settings in the normal generator setup screen?

What kind of smoothing do you usually use?