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Decimation FIR filter design

Started by QQ March 24, 2010
Hi, does anyone know how to design a decimation filter in MATLAB. I do not
want CIC filter, but would like to have FIR filter. Thank you very much!
You can use MFILT (Multirate Filter Implementation). The built-in help, which is accessible by typing 'help mfilt' in the MATLAB command window, contains an example of a low-pass decimator design.

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Alexander

Hi, does anyone know how to design a decimation filter in MATLAB. I do not
>want CIC filter, but would like to have FIR filter. Thank you very much!

 









You could use firgr



http://www.mathworks.com/access/helpdesk/help/toolbox/filterdesign/ref/firgr.html



A FIR filter for decimation is just like any other FIR filter but you only need to calculate the output samples you need, that is every nth sample for a decimation factor of n. You can have multiple stop bands with firgr. You specify the stop bands to cover the bands of frequencies that will alias into your wanted band after decimation. You can allow the response to rise at frequencies that don't alias into your band.



Steve











On Wed Mar 24 1:44 , QQ sent:





 



Hi, does anyone know how to design a decimation filter in MATLAB. I do not want CIC filter, but would like to have FIR filter. Thank you very much!
















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Hi Steve,

There is a command in MATLAB : "filterbuilder" . It has the option for
designing various types of filter. You can design a Decimation FIR filter
using this.

Regards-Vaibhav