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```
>Does the sum of your coefficients equal 1?
>
>-jim
>
It unless concerns that that at calculation of the frequency response on
frequency on 1/2 new sampling frequency, suppression appears distinct from
3dB?
P.S. Coefficients have been calculated in fdatool (matlab).
```

alex65111 wrote: > > >Does the sum of your coefficients equal 1? > > > >-jim > > > > It unless concerns that that at calculation of the frequency response on > frequency on 1/2 new sampling frequency, suppression appears distinct from > 3dB? Sorry I don't speak that language. The question I asked could be answered with yes or no. -jim > > P.S. Coefficients have been calculated in fdatool (matlab).

All thanks for attempts to help me but I have not understood where I am mistaken. Let's try to ask a question easier and particularly. Let's assume at us there is a system consisting of the filter and following for it decimation. The impulse response of filter H=[0.033402 0 -0.015082 0 0.018968 0 -0.024143 0 0.031336 0 -0.042322 0 0.061361 0 -0.10468 0 0.31784 0.5 0.31784 0 -0.10468 0 0.061361 0 -0.042322 0 0.031336 0 -0.024143 0 0.018968 0 -0.015082 0 0.033402]; Decimation factor is 2. How correctly to calculate the combined characteristic of system as a whole? The calculated characteristic should show what suppression on frequency 0.5 (after decimation)?