function sai = ruidorosa(amostras, nregs)
regs=randn(1, nregs);
saida = zeros(1,amostras);
for i = [1:amostras]
   for j = [1:nregs]
      if xor(bitand(i, bitshift(1,j-1)) ,bitand(1+i, bitshift(1,j-1)))
         regs(j) = randn(1,1);
      end;
   end;
	saida(i) = sum(regs);
end;
sai = saida;