ADSP2181 IIR filter help needed please

Started by carlvonclauswitz June 3, 2005
Hi all,

I have designed a 4th order bandpass filter using MatLab FDA tool. 
The filter contains 2 2nd order stages which is fine and I can view
them in Simulink.  The filter is a chebyshev type 1 with fp1=300Hz
fp2=3kHz.

I have the coefficients and scaling factors but have no idea how to
code a cascaded (2 sos) filter in ADSP2181 assy language.

If anybody could point me in the direction of a good tutorial or help
me with the ADSP assembly language, I would be very greatful.  I have
tried the documentation and language guide but it doesn't really
help.

I think what i need is a good tutorial which explains how to get from
a simple IIR difference equation to the assembly language on ADSP
2181.

Sorry if this seems an overly basic question, but I am having no luck
with the documentation and have achieved nothing in the past two days
of trying.

Thanks in advance,
Carl 

:oops:

carl@mak2.co-dot-uk.no-spam.invalid (carlvonclauswitz) wrote in 
news:3tmdnScRnN2jbj3fRVn_vg@giganews.com:

> Hi all, > > I have designed a 4th order bandpass filter using MatLab FDA tool. > The filter contains 2 2nd order stages which is fine and I can view > them in Simulink. The filter is a chebyshev type 1 with fp1=300Hz > fp2=3kHz. > > I have the coefficients and scaling factors but have no idea how to > code a cascaded (2 sos) filter in ADSP2181 assy language. > > If anybody could point me in the direction of a good tutorial or help > me with the ADSP assembly language, I would be very greatful. I have > tried the documentation and language guide but it doesn't really > help. > > I think what i need is a good tutorial which explains how to get from > a simple IIR difference equation to the assembly language on ADSP > 2181. > > Sorry if this seems an overly basic question, but I am having no luck > with the documentation and have achieved nothing in the past two days > of trying. > > Thanks in advance, > Carl > >:oops: > >
Have you read the chapter in the ADI book, Digital Signal Processing Applications for the ADSP-2100 Family. There is a link on our developers page: http://www.danvillesignal.com/index.php?id=dspdev -- Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com