I am learning about SQNR and when i google i get its formula that it is equal to
6.02 db(per bit)+1.76 db
But in our Lab/class, we saw different formula ,which is following formula when using MATLAB:
Where x is original signal and E is error/noise signal
I am confused which formula is correct/proper?
Becuase if we use former formula we get different results and if we use latter formula we get different results
Based upon answer of MR Dan, i have updated my question and also included the MATLAB code we saw in our Lab
clc %clears all the text from the Command Window clear all %clear/delete the variables created in close all %delete all the figures whose handles are not f=100%signal frequecny Fs=200; %sampling frequency Ts=1/Fs n=4; %number of bits L=2.^n; %quantization levels t=0:Ts:0.1; %time interval x=cos(2.*pi.*f.*t); %Signal x(t) D=(max(x)-min(x))/(L-1); xq=quant(x,D); %quantization E=x-xq; %error calculation SQNR=10*log10(sum(x.^2)/sum(E.^2))