IIR Filter Funktion with DSP5416

one more question.

'h' parameter of the function iir32() from DSPLIB have 3 Values for
dominator and only 2 values for numenator. so, but I have the
following Array real64_T_T NUM[][3] also I have 3 values for
numenator.

what is this?

thanks

johnbesel@web.de (Eugene) wrote:

>one more question.
>
>'h' parameter of the function iir32() from DSPLIB have 3 Values for
>dominator and only 2 values for numenator. so, but I have the
>following Array real64_T_T NUM[][3] also I have 3 values for
>numenator.
>
>what is this?
>
>thanks

It's been a while since I've worked with that form, but it might be
something like:

0 = b0x[n] + b1x[n-1] + b2x[n-2] - a0y[n] - a1y[n-1] - a2y[n-2]

bring y[n] to the left side, and divide through by a0 on the left side
to get your new coefficients for:

y[n] = b0'x[n] +b1'x[n-1] + b2'x[n-2] - a1'y[n-1] - a2'y[n-2]

But I recommend that you prove this using something else, before the
DSP ... like using a test signal in C or matlab.

Robert ( help from an American )




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