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delta-sigma toolbox simulation problem

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ballance

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hello everyone

i don't know what are the f(sample) and f(signal) of below program.
please help me !!
thanks

------------------------------------------------------
osr=64;
h=synthesizeNTF(5,osr,1);
nlev=3;
nfft=2^13;
tone_bin=57;
t=[0:nfft-1];
u=0.5*(nlev-1)*sin(2*pi*tone_bin/nfft*t);
v=simulateDSM(u,h,nlev);
n=1:150;
stairs(t(n),u(n),'g');
hold on;
stairs(t(n),v(n),'b');
------------------------------------------------------
 

hi, plz see below:

sampling frequency fs = 1

osr=64; ==> BW = 1/2/64 = 7.8125*10^-3 (normalized to fs);

nfft=2^13;
tone_bin=57;
u=0.5*(nlev-1)*sin(2*pi*tone_bin/nfft*t);
==> input frequency fin = 57/2^13 = 6.958*10^-3 (normalized to fs);
==> fin = 0.89BW

in summary, this is to simulate with osr = 64, sampling frequency = 1, input signal bandwidth = 7.8125*10^-3 and input test frequency = 0.89*BW

hope it helps

best regards,
c.m.
 
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    ballance

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