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Strange freq characteristics when unsmoothed
I am trying to use Fuzzmeasure to test a speaker freq response in an anechoic chamber.
Sine sweep = 2s from 0-40000 hz.
The mics we use are sennheiser ke4s which are quite flat.
With a 1/48 octave smoothing the output of the speaker is very nice and flat.
but without smoothing, i get substantial reverb and distortion.. which I don't quite understand from what.
Also, is there a way to use golay codes or MLS to do measurements?
Sine sweep = 2s from 0-40000 hz.
The mics we use are sennheiser ke4s which are quite flat.
With a 1/48 octave smoothing the output of the speaker is very nice and flat.
but without smoothing, i get substantial reverb and distortion.. which I don't quite understand from what.
Also, is there a way to use golay codes or MLS to do measurements?
I’m undecided
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Inappropriate?Interesting. I'm not entirely sure why you'd be noticing severe reverberation, though you might want to consider things like the reflection off the microphone and microphone stand as possible sources of that reverberation.
Also, what sort of audio hardware are you using, and what start/end silence are you using in your sweep parameters? Furthermore, are you using FuzzMeasure 3.0?
FuzzMeasure only uses the log sweep signal to do its measurements right now. To use either MLS or golay codes using the deconvolution technique that I do won't give you nearly as good results, and especially won't provide the distortion immunity that log sweeps provide. See Müller's paper on swept sine measurements if you're interested in a detailed comparison between the many measurement techniques. -
Inappropriate?We were surprised too. As the recording placement was done similar to our reference setup, so interference from microphone stand and other obstacles were acoustically minimised. It's also interesting that the ringing was at >10khz.
I am testing out FuzzMeasure 3.0, with no start/end silence.
Audio hardware is my Macbook, linked to an altec lansing Orbit speaker.
The Sennheiser mic was driven with a pre-amp then went through line-in to the laptop.
We frequently do HRTF recordings apart from room acoustics, so
Golay codes are used because of their short duration and high gain.
I’m undecided
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Inappropriate?I’d be interested in seeing your results. Can you load the file somewhere we can dowmnload it? -
Inappropriate?Hi there, sorry was away till now.
I've zipped an exported filter, it's pretty small. Do you have an email address I can send to?
cheers
I’m confident
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Inappropriate?You can send it to support@supermegaultragroovy.com and I can take a look at it.
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