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
2019년 8월 27일
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
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Devineni Aslesha
2019년 9월 4일
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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