import spinorama .txt data in rew with import impulse response. but how precise is the showed result in group delay and excess group delay ?

user44455555 · Mar 13, 2023

Hello

It is good enough to import impulse response in rew from SPL horizontal.txt files from that page for example https://www.audiosciencereview.com/...rk-rokit-5-gen-4-review-studio-monitor.20711/

how much error % do you think have this way to see group delay ?. or is it complete wrong for bass range and can show a speaker with shorter group delay as a speaker with longer group delay ?. or maybe there can do better settings for display ?
a user on this audio science page write "From the Spinorama data published by Amir it is impossible to generate the excess phase frequency response or the complete phase frequency response of the measured speaker. So the group delay generated from the Spinorama data is not correct either - the only exception where this difference hardly matters are CB single driver full range loudspeakers."

is that true ?

rew output this

another with diffrent smoothing. values look enough for 1/24 smoothing too

John Mulcahy · Mar 13, 2023

user44455555 said:
It is good enough to import impulse response in rew from SPL horizontal.txt files from that page for example https://www.audiosciencereview.com/...rk-rokit-5-gen-4-review-studio-monitor.20711/

Those files are not impulse responses, they are columns of SPL values at different angles. REW cannot import them correctly as it assumes the third figure in each line is a phase value, it is actually a repeat of the frequency value for the next set of data. There is no phase data in the file so nothing to use to generate group delay. Producing a minimum phase response from the SPL values doesn't tell you anything about the measured phase.

user44455555 · Mar 13, 2023

John Mulcahy said:
Those files are not impulse responses, they are columns of SPL values at different angles. REW cannot import them correctly as it assumes the third figure in each line is a phase value, it is actually a repeat of the frequency value for the next set of data. There is no phase data in the file so nothing to use to generate group delay. Producing a minimum phase response from the SPL values doesn't tell you anything about the measured phase.

ok, i thought this files have some phases in and so rew can create all. maybe you can then do a little fix so rew bring error no impulse response or no phase in data

sam_adams · Mar 13, 2023

user44455555 said:
ok, i thought this files have some phases in and so rew can create all. maybe you can then do a little fix so rew bring error no impulse response or no phase in data

Amir does not export the data from his spinoramas with phase data—yes, it has been asked for. As John said, you can't directly import the data into REW. You must first import the data into a spreadsheet and then export/copy the data from columns A and B—which are the zero degree on-axis measurements—to a text file for import into REW. If you examine the column headers you will see the labelling for the angle that the measurement was taken.

user44455555 · Mar 14, 2023

sam_adams said:
Amir does not export the data from his spinoramas with phase data—yes, it has been asked for. As John said, you can't directly import the data into REW. You must first import the data into a spreadsheet and then export/copy the data from columns A and B—which are the zero degree on-axis measurements—to a text file for import into REW. If you examine the column headers you will see the labelling for the angle that the measurement was taken.

The FR look ok, and i thought if there is wrong numbers interpret as phase data, the phase and groupdelay look very worse. but the importet data look possible in phase.
there are .csv files for headphones. This i can not import in REW. is there a easy way ?

this are the .csv files https://www.audiosciencereview.com/forum/index.php?threads/1more-sonoflow-nc-headphone-review.42849/

it contain this. also no phase

"Frequency Response Reference 425 Hz @ 94 dBSPL",,,
ANC,,Right,
X,Y,X,Y
Hz,dBSPL,Hz,dBSPL
19.2307692307692,106.497187175246,19.2307692307692,97.5274555441425
20.8333333333333,106.062989969788,20.8333333333333,98.7758023973806
22.4358974358974,105.38293261108,22.4358974358974,99.59843853463
24.0384615384615,104.781429059751,24.0384615384615,100.342176912993
25.6410256410256,104.238288093212,25.6410256410256,100.763371540925
27.2435897435897,103.800865515365,27.2435897435897,100.872671540611
28.8461538461538,103.477356585678,28.8461538461538,100.75966451115
30.448717948718,103.223680111274,30.448717948718,100.669295783525
32.051282051282,103.014982902435,32.051282051282,100.808541072815
33.6538461538462,102.84391258779,33.6538461538462,101.494546932459
35.2564102564103,102.664625539803,35.2564102564103,102.373321125437

sm52 · Mar 14, 2023

There is no phase data in this data. Only frequency and amplitude. What phase do you want to see?

sam_adams · Mar 14, 2023

user44455555 said:
The FR look ok, and i thought if there is wrong numbers interpret as phase data, the phase and groupdelay look very worse. but the importet data look possible in phase.
there are .csv files for headphones. This i can not import in REW. is there a easy way ?

this are the .csv files https://www.audiosciencereview.com/forum/index.php?threads/1more-sonoflow-nc-headphone-review.42849/

it contain this. also no phase

"Frequency Response Reference 425 Hz @ 94 dBSPL",,,
ANC,,Right,
X,Y,X,Y
Hz,dBSPL,Hz,dBSPL
19.2307692307692,106.497187175246,19.2307692307692,97.5274555441425
20.8333333333333,106.062989969788,20.8333333333333,98.7758023973806
22.4358974358974,105.38293261108,22.4358974358974,99.59843853463
24.0384615384615,104.781429059751,24.0384615384615,100.342176912993
25.6410256410256,104.238288093212,25.6410256410256,100.763371540925
27.2435897435897,103.800865515365,27.2435897435897,100.872671540611
28.8461538461538,103.477356585678,28.8461538461538,100.75966451115
30.448717948718,103.223680111274,30.448717948718,100.669295783525
32.051282051282,103.014982902435,32.051282051282,100.808541072815
33.6538461538462,102.84391258779,33.6538461538462,101.494546932459
35.2564102564103,102.664625539803,35.2564102564103,102.373321125437

The linked files are CSV data to create a frequency response graph. You can use them to plot a chart in Excel after importing the data. The linked files are not spinorama data since they are measurements of headphone response done on a Gras 45-CA. Amir does not post phase data in any of his spinorama files because the software module from Klippel to do that costs thousands of dollars extra.

If you are interested in working with speaker spinorama data, I suggest that you look at this discussion over at ASR and download the attached MatLAB/GNU Octave scripts from user Maiky76.

import spinorama .txt data in rew with import impulse response. but how precise is the showed result in group delay and excess group delay ?

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John Mulcahy

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