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Discussion Groups | Comp.DSP | frequency respons of halfband filter?

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frequency respons of halfband filter? - alex65111 - 2009-04-15 17:31:00



Re: frequency respons of halfband filter? - jim - 2009-04-15 18:17:00



Re: frequency respons of halfband filter? - alex65111 - 2009-04-15 18:35:00

>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).


Re: frequency respons of halfband filter? - jim - 2009-04-15 19:03:00

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).


Re: frequency respons of halfband filter? - 2009-04-15 20:46:00



Re: frequency respons of halfband filter? - alex65111 - 2009-04-16 04:32:00



Re: frequency respons of halfband filter? - Fred Marshall - 2009-04-16 11:45:00



Re: frequency respons of halfband filter? - 2009-04-16 23:01:00



Re: frequency respons of halfband filter? - alex65111 - 2009-04-17 00:58:00

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)?


Re: frequency respons of halfband filter? - 2009-04-17 11:13:00



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