Guest
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 Posted:
Thu Jan 06, 2005 6:42 am Post subject:
Re: IIR Filter Funktion with DSP5416 |
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johnbesel@web.de (Eugene) wrote:
| Quote: | 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
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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 )
( modify address for return mail )
www.numbersusa.com
www.americanpatrol.com |
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