Determining Acoustic Center

akunec · 24th May 2007, 12:03 AM

Would it be possible to determine the acoustic center relative to another driver by applying a burst of noise to the driver, and measuring how long it takes to reach the mike? Then measure how long it takes for the other driver, and subtract the difference?

Thanks
Alex

69stingray · 24th May 2007, 02:05 AM

In theory I think so, but I really shouldn't be answering this....not sure how you would "time" the difference.

akunec · 24th May 2007, 04:02 AM

I would have 1 input as a signal from the amplifier, and another input as the microphone.

cs · 24th May 2007, 08:06 AM

Sounds like a good idea !

I think to get the most accurate result, you would need a signal which only occupies the spectral region where the two drivers overlap. Maybe two closely spaced tones would work, as you could use the envelope of the tones to measure the delay.

Shaun · 24th May 2007, 08:31 AM

Quote:

Originally posted by akunec
Would it be possible to determine the acoustic center relative to another driver by applying a burst of noise to the driver, and measuring how long it takes to reach the mike? Then measure how long it takes for the other driver, and subtract the difference?

Thanks
Alex

You have it spot in. That is exactly the way to determine relative acoustic offset.

see here
Evaluating relative acoustic offset

24th May 2007, 12:03 AM	#1
akunec diyAudio Member Join Date: Aug 2004 Location: Alberta	Determining Acoustic Center Would it be possible to determine the acoustic center relative to another driver by applying a burst of noise to the driver, and measuring how long it takes to reach the mike? Then measure how long it takes for the other driver, and subtract the difference? Thanks Alex

24th May 2007, 02:05 AM	#2
69stingray diyAudio Member Join Date: Apr 2005 Location: NH	In theory I think so, but I really shouldn't be answering this....not sure how you would "time" the difference. __________________ Audio DIY Page FOLLOWMY529.COM - Subscribe and follow the performance of my daughter's 529 College Saving Account.

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24th May 2007, 04:02 AM	#3
akunec diyAudio Member Join Date: Aug 2004 Location: Alberta	I would have 1 input as a signal from the amplifier, and another input as the microphone.

24th May 2007, 08:06 AM	#4
cs diyAudio Member Join Date: Jun 2005 Location: .	Sounds like a good idea ! I think to get the most accurate result, you would need a signal which only occupies the spectral region where the two drivers overlap. Maybe two closely spaced tones would work, as you could use the envelope of the tones to measure the delay.

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