what is the noise bandwidth considered while calcuating SNR ; for func of the form .. r = snr(x,fs,n)

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what is the noise bandwidth considered while calcuating SNR ; for func of the form .. r = snr(x,fs,n)

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Devineni Aslesha
Devineni Aslesha 2019-8-27
The noise bandwidth is equal to the sampling frequency. This can be obtained by plotting the power spectral density of noise.
Use the below code for reference.
rng default
Fi = 2500;
Fs = 48e3;
N = 1024;
x = sin(2*pi*Fi/Fs*(1:N)) + 0.00001*randn(1,N);
w = kaiser(numel(x),38);
[Sxx, F] = periodogram(x,w,numel(x),Fs,'centered');
plot(F,10*log10(Sxx));
xlabel('Frequency (Hz)');
ylabel('Power/Frequency(dB/Hz)');
title('Power Spectral Density');
In the above plot, noise bandwidth = Fs
Doc Link:
  2 个评论
Veeresh S
Veeresh S 2019-9-3
Thanks for the reply Devineni Aslesha.
If i get the SNR for the same i'll see the following tmp1.PNG
which shows the freq componets upto fs/2 .
So , which is it fs or fs/2 ?
Devineni Aslesha
Devineni Aslesha 2019-9-4
In the given plot, noise bandwidth is equal to fs. Eventhough, the frequency components are shown upto fs or fs/2, the only difference it makes is a single sided or double sided spectrum respectively. In both cases, noise bandwidth is equal to fs.

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