Soundcard noise level

guwakzhai · 27th October 2010, 12:22 PM

hello there.. this is the first time i create a thread here.. please forgive me if i've done anything wrong..

i've tested my Creative Sound Blaster X-Fi Surround 5.1 usb soundcard with RMAA and got the result of noise level as attached..

my question is why is the noise increases towards lower freq starting from 300Hz?

who's the culprit?

Okv · 28th October 2010, 11:58 PM

This may be caused by the FFT window being too small, i.e. too few samples.
If that is the case, this is caused by the measurement (FFT software settings) and not the sound card.

Try to find somewhere in your software where you can set "FFT Size", "FFT Length" and increase the length.

guwakzhai · 29th October 2010, 03:38 PM

Thanks for the reply! Appreciate it.. But i couldn't find any FFT settings in RMAA.. Maybe i'll try ARTA instead..

27th October 2010, 12:22 PM	#1
guwakzhai diyAudio Member Join Date: Apr 2010	Soundcard noise level hello there.. this is the first time i create a thread here.. please forgive me if i've done anything wrong.. i've tested my Creative Sound Blaster X-Fi Surround 5.1 usb soundcard with RMAA and got the result of noise level as attached.. my question is why is the noise increases towards lower freq starting from 300Hz? who's the culprit?

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28th October 2010, 11:58 PM	#2
Okv diyAudio Member Join Date: Jul 2009 Location: Aalesund, Norway	This may be caused by the FFT window being too small, i.e. too few samples. If that is the case, this is caused by the measurement (FFT software settings) and not the sound card. Try to find somewhere in your software where you can set "FFT Size", "FFT Length" and increase the length.

29th October 2010, 03:38 PM	#3
guwakzhai diyAudio Member Join Date: Apr 2010	Thanks for the reply! Appreciate it.. But i couldn't find any FFT settings in RMAA.. Maybe i'll try ARTA instead..

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