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iir filter problem..really need help...

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intelnside

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[B,A] = cheby2(2,40,[Freq1, Freq2]);

can some 1 explain to me tis command?
the freq1 and freq2 is cutoff freq, how can i find the cutoff freq ?

[sos2, g2] = tf2sos (B2, A2,'up','inf'); <---can also explain to me this command?

i very blur to do this all...
but it is my final year project... please guide me....
 

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