Round or truncate? 截取和舍入对滤波器输出精度影响？

Hi Kaz,

thanks a lot for yuor reply.

I still has something unclear about "DC bias "and "Noise". Any clarification appreciated.

In your table, how can "DC bias "and "Noise" for the 4 examples of truncation algorithms . Take the truncate algorithms for example，

truncate

-7/2 -3.5 -4 dc= -4+3.5= -0.5 Noise=？？？

-5/2 -2.5 -3 dc= -3+2.5= -0.5 Noise=？？？

-3/2 -1.5 -2 dc= -2+1.5= -0.5 Noise=？？？

-0.5 n/a

0.5 n/a

3/2 1.5 1 dc= 1-1.5= -0.5 Noise=？？？

5/2 2.5 2 dc= 2-2.5= -0.5 Noise=？？？

7/2 3.5 3 dc= 3-3.5= -0.5 Noise=？？？

but how "noise" ???