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Phasing issues |
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gen0me 
Young Croc 
Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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 Topic: Phasing issuesPosted: 08 May 2018 at 11:01pm |
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Its simple 889hz played on 2" compresion driver with horn. Around 12db/oct. White one is generator, red mic input.  So which of those red waves does your group delay software refer to?
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toastyghost
The 10,000 Points Club 
Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Posted: 09 May 2018 at 1:01am |
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If you’re referring to dual channel FFT, both. It will compare the generated signal via loop back to the mic input, and display traces showing the difference between the two.
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kevinmcdonough
Old Croc 
Joined: 27 June 2005 Location: Glasgow Status: Offline Points: 3751 |
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Posted: 10 May 2018 at 9:24am |
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Lol
Not totally sure what point your trying to make. And its interesting to see that your speaker (the red/pink trace as you say) seems to have been able to receive the signal and for that signal to then travel to the measurement mic and be picked up, all before the generator has actually started playing any signal!  i presume your delay time compensation isn't set quite right?But in either case, as Kyle says the software simply compares the signal as generated at the mixing desk to the signal picked up by the microphone, and shows you the differences both in frequency and time/phase. What people do with that information and how you use it to correct (or mess up ) their sound is down to them.k
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gen0me
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Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Posted: 10 May 2018 at 2:28pm |
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Generator is delayed on this picture.
Yes it shows difference in frequency in time but what does it mean if the speaker output wave looks like above. The frequency on the beggining is way higher then rest of the wave. I suspect this hole distortion at the beggining of the wave is due to very spiky impulse response of compression driver. This crazy mid of mine dont distort the frequency. Distorts way more amplitude. Dont know how big is the low pass part thought. Ofc this starting of a wave is looking this way due to the generator starting so doing measurement with sweep should help the problem. Should be more realistic for changing sounds right? And how about random binary noise? Will it also distort the signal this way? I have some problem with accuracy using measurement from REW to compare it to the above way of measurement. Now comparing this to measurements im curious how will it look. Just some maniacal thoughts. Have you meet highs on a really high spl level playing nicely and pleasuring long sounds and killing ears on claps?
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