How to calculate S/N ratio

synthius · 27th April 2008, 09:54 PM

Can someone please tell me how to calculate the S/N ratio of this FFT?

Thanks

synthius · 28th April 2008, 12:34 AM

nevermind, got it :
95.7 dB

BWRX · 28th April 2008, 03:56 AM

It depends what figure you use for the noise. It looks like you just used -70dBV. 25.7dBV is about 19.3V - is this the SNR of your chip amp project at full scale output?

synthius · 28th April 2008, 04:39 AM

Yes I used -70dBV. I believe this is at 45Watts from a LM4780

27th April 2008, 09:54 PM	#1
synthius diyAudio Member Join Date: Nov 2007	How to calculate S/N ratio Can someone please tell me how to calculate the S/N ratio of this FFT? Thanks

28th April 2008, 03:56 AM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	It depends what figure you use for the noise. It looks like you just used -70dBV. 25.7dBV is about 19.3V - is this the SNR of your chip amp project at full scale output? __________________ Brian

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to calculate the duty ratio of L4981???	davy_shi	Power Supplies	5	20th May 2005 09:59 AM
I want pre-amp schematic with A s/n ratio 92 db or more	jinkuchi	Pass Labs	11	6th June 2004 09:21 AM
So/Sl ratio?	Tomac	Multi-Way	3	14th January 2004 11:48 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th April 2008, 12:34 AM	#2
synthius diyAudio Member Join Date: Nov 2007	nevermind, got it : 95.7 dB

28th April 2008, 04:39 AM	#4
synthius diyAudio Member Join Date: Nov 2007	Yes I used -70dBV. I believe this is at 45Watts from a LM4780

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)