?? calcsnrbp.m
字號:
function [snrdB,ptotdB,psigdB,pnoisedB] = calcSNRBP(vout,f,fBL,fBH,w,N,Vref)
% function [snrdB,ptotdB,psigdB,pnoisedB] = calcSNR(vout,f,fB,w,N,Vref) 25/09/99 FF Removed
% SNR calculation in the time domain (P. Malcovati, S. Brigati)
% Modified 25/09/99 (F. Francesconi) for BandPass Sigma-Delta Modulators
% vout: Sigma-Delta bit-stream taken at the modulator output
% f: Normalized signal frequency (fs -> 1)
% fB: Base-band frequency bins
% w: windowing vector
% N: samples number
% Vref: feedback reference voltage
%
% snrdB: SNR in dB
% ptotdB: Bit-stream power spectral density (vector)
% psigdB: Extracted signal power spectral density (vector)
% pnoisedB: Noise power spectral density (vector)
%
% 25/09/99 FF - fB removed for fBL Lower Band Limit and fBH Higher Band Limit
% fB=ceil(fB); 25/09/99 FF Removed
fBL=ceil(fBL);
fBH=ceil(fBH);
signal=(N/sum(w))*sinusx(vout(1:N).*w,f,N); % Extracts sinusoidal signal
noise=vout(1:N)-signal; % Extracts noise components
stot=((abs(fft((vout(1:N).*w)'))).^2); % Bit-stream PSD
ssignal=(abs(fft((signal(1:N).*w)'))).^2; % Signal PSD
snoise=(abs(fft((noise(1:N).*w)'))).^2; % Noise PSD
% pwsignal=sum(ssignal(1:fB)); % Signal power 25/09/99 FF Removed
% pwnoise=sum(snoise(1:fB)); % Noise power 25/09/99 FF Removed
pwsignal=sum(ssignal(fBL:fBH)); % Signal power
pwnoise=sum(snoise(fBL:fBH)); % Noise power
snr=pwsignal/pwnoise;
snrdB=dbp(snr);
norm=sum(stot)/Vref^2; % PSD normalization
if nargout > 1
ptot=stot/norm;
ptotdB=dbp(ptot);
end
if nargout > 2
psig=ssignal/norm;
psigdB=dbp(psig);
end
if nargout > 3
pnoise=snoise/norm;
pnoisedB=dbp(pnoise);
end
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