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Discussion Groups | Matlab DSP | Cascaded to parallel conversion for IIR filters

Technical discussion about Matlab and issues related to Digital Signal Processing.


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Cascaded to parallel conversion for IIR filters - - Aug 15 10:03:58 2006

Hi All,
I am new to this group, I am working on Graphic Equalizer for octave 1 with
biquad IIR filters. I had implemented this one in cascade form and now trying to
implement same in parallel form. First of all I calculate the single equivalent
Transfer Funtion from several cascaded biquad filter and then using residuez of
matlab (which is based on partial fraction expansion) try to realize the filter
in parallel, but found the different frequency response from  cascade and
parallel. One more thing, the frequency response  will be same when I skiped
some initial center frequencies (like upto 250 Hz) and then apply the same thing
and it does work well. I didn't understand why the filters with all center
frequencies(with lower frequency) not give the same response as cascaded
structure. Does it the problem with frequency resolution ? Also is there any
other method to solve this problem as i want to implement the same thing for
real-time ?