Question about filters and verilog etc..

I need to make some filters now for some project in FPGA.
I was wondering if some free (open source?) software
exists that outputs verilog (or a xilinx module for example)
with as input say -3dB point, slope, poles, low / high pass etc.?
These programs do exist for analog filters, some from IC
manufacturers.
Is such a thing feasable (to do in verilog) does it exist?
Jan

Hi Jan,

Our company Tyder has a product ONEoverT and it outputs VHDL which you can
use to
design filters on FPGAs....FIRs (Windowed & Optimal) loads of other FIR
types, and also
different types of IIR filters.

It is not free but it is on sale at a very low price. There are some case
studies on the website which
you can download. You can also download the demo version.

See website
www.tyder.com
Regards
Michael Gallen
"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
news:1071261764.857468@evisp-news-01.ops.asmr-01.energis-idc.net...
> I need to make some filters now for some project in FPGA.
> I was wondering if some free (open source?) software
> exists that outputs verilog (or a xilinx module for example)
> with as input say -3dB point, slope, poles, low / high pass etc.?
> These programs do exist for analog filters, some from IC
> manufacturers.
> Is such a thing feasable (to do in verilog) does it exist?
> Jan

Just use a filter design tool to generate the coefficients.  The HDL is
pretty simple.  ScopeFIR is one example.

Of course, you can also do a lot of this work using tools like Excel from
fundamental DSP/Filter theory/math.  Excel has a SUMOFPRODUCTS() function
that come in handy for some of this work (like implementing a DFT to
generate filter frequency response and graph it).


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Euredjian

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"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
news:1071261764.857468@evisp-news-01.ops.asmr-01.energis-idc.net...
> I need to make some filters now for some project in FPGA.
> I was wondering if some free (open source?) software
> exists that outputs verilog (or a xilinx module for example)
> with as input say -3dB point, slope, poles, low / high pass etc.?
> These programs do exist for analog filters, some from IC
> manufacturers.
> Is such a thing feasable (to do in verilog) does it exist?
> Jan

On a sunny day (Sat, 13 Dec 2003 07:37:46 GMT) it happened "Martin Euredjian"
<0_0_0_0_@pacbell.net> wrote in
<elzCb.70799$Ns6.25727@newssvr25.news.prodigy.com>:

>Just use a filter design tool to generate the coefficients.  The HDL is
>pretty simple.  ScopeFIR is one example.
>
>Of course, you can also do a lot of this work using tools like Excel from
>fundamental DSP/Filter theory/math.  Excel has a SUMOFPRODUCTS() function
>that come in handy for some of this work (like implementing a DFT to
>generate filter frequency response and graph it).
>
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Martin Euredjian
Hi, I downloaded ScopeFIR, and guess what, it runs fine on wine too, in
Linux.
So thank you.
Then I played a bit with it, now I may perhaps input those coefficients to
the FIR I found on opencores.
But playing with ScopeFIR I got that 'deja-vue' feeling....
Some time ago I did some FIR in C for a horizontal re-scaler (see paper at
http://www.home.zonnet.nl/panteltje/subtitles/lowpass.html ).
Think I did not use that FIR in the end, that project was abandoned when I
started using DVD.
But in that time I did a whole lot of reading up on digital signal processing
and IIR FIR etc..
Now then I used a program in Linux called 'remez' to calculate coefficients.
I think ScopeFIR is either from the same author or a blunt copy (windows
port) of remez, I dunno.
But even the examples and the frequency choice is the same......
So I looked up remez on my machine (google for
/root/compile/filters/remez/REMEZ16.EXE if you use windows), I do not
remember where I found remez, google remez or remez.c remez uses
gnu-plot.....
hehe
Since ScopeFIR asks 100$ after 60 days, I will be using remez likely after
that time.
Jan