Just another thought. Did you make sure you cycled through the coeffs in
the right order.
Try reversing the sequence in which you use the coeffs.
Although I am as careful as I can be, I can't tell you how many times I end
up experimenting
till I get the sequencing right.

Regards,
Dave Shaw
>
> Could someone here please give me advice on what mistakes in implementing
> the polyphase M-fold decimation filters lead to the sort of "weirdness"
that
> I got from my C implementation? That would be of much support in finding
> what I did wrong.
>
> If someone who desires to help me wants to have a look at the Simulink
Model
> that I implemented, to the output of my C (for SHARC) implementation,
and/or
> to my C implementation itself, please let me know, and I will be more than
> pleased in sending it to you.
>