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Posted: **Sun Dec 18, 2005 5:15 pm**

hi guys. I am new to this forum. Aactually i am stuck in a project
where i have to filter white noises using SNR analysis and for that i hav
to use matlab. i am using using digital LPF with butterwood method th
input signal is continous time with some white guassian noise. i have t
calculate the power from the output singal. i am stuck how to find th
power of the filtered signal and then calcualte SNR. plz some one help m
out i just want a matlab command or code to find power of the signa
inorder to find SNR

Posted: **Mon Dec 19, 2005 9:15 am**

"ali khan" <capt_ali@hotmail.com> wrote in message
news:_4Sdnd3oUcBe9DjeRVn-jg@giganews.com...

hi guys. I am new to this forum. Aactually i am stuck in a project
where i have to filter white noises using SNR analysis and for that i have
to use matlab. i am using using digital LPF with butterwood method the
input signal is continous time with some white guassian noise. i have to
calculate the power from the output singal. i am stuck how to find the
power of the filtered signal and then calcualte SNR. plz some one help me
out i just want a matlab command or code to find power of the signal
inorder to find SNR

Just work out the variance (assuming zero dc) ie the sum of squares of all

the samples divided by the number of samples. This is the power. Then take
10log10(P0/Pi) where Po and Pi are the output and input power respectively.
This is SNR.

Tam

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SNR analysis

SNR analysis

Re: SNR analysis