Breaking News
Comments
Newest First | Oldest First | Threaded View
Adam-Taylor
User Rank
Blogger
re: The “Ins and Outs” of digital filter design and implementation
Adam-Taylor   3/4/2012 5:51:10 PM
NO RATINGS
Hi Juergen. I am the author of this article, thanks for the comments, I agree that Filter design is complex and many books have been written on the subject (and I would imagine many more shall be) This article was written as a simple introduction to digital filters (it was initially printed in the Xilinx Xcell FPGA 101 section) introducing where the ideas behind filtering, how to generate the coefficents and the importance of windowing etc. You are correct that there is a pretty good follow article on this on the more advanced filter options an engineer can undertake to reach his final system implementation. Cheers Adam

juergen.schuhmacher_#1
User Rank
Rookie
re: The “Ins and Outs” of digital filter design and implementation
juergen.schuhmacher_#1   3/3/2012 10:43:20 PM
NO RATINGS
Hm, all digital filters work sequentially and have the same (MUL, ADD) structure, es mentioned above - especially not inside FPGAs. The strongest advantage of FPGAs is that the engineer has the possibility (and the duty) to choose the amount of parallelisation in order to find the balance between costs, speed and throughput. Therefore optimized filter design is more than instantiating a core, which (in this case) is not even capable to find and optimize the parameters and coefficients (unlike some competitor's products) and is limited in data width too. Nowaday's digital filter design for e.g. high speed camera applications (flight control, air bone, object recognition, 3D vector extraction) is mostly done in parallel with tricky coefficient optimizing to balance quality and precision in order to process large images in realtime, performing filtering, binning, non uniformity correction and similar tasks rapidly enough with low area and current requirements. Also there are a lot of decisions to make to optimize filters in complex multi stage stage constellations used with cascaded half band filtering, compensation filtering and combinations of pixel processing filters like performing "false pixel reconstruction", "prebinning filtering" and "missing pixel interpolation" simultaneously. Many solutions for that strongly differ from the theretically found coefficients. More Information should follow.



Flash Poll
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Rishabh N. Mahajani, High School Senior and Future Engineer

Future Engineers: Don’t 'Trip Up' on Your College Road Trip
Rishabh N. Mahajani, High School Senior and Future Engineer
2 comments
A future engineer shares his impressions of a recent tour of top schools and offers advice on making the most of the time-honored tradition of the college road trip.

Max Maxfield

Juggling a Cornucopia of Projects
Max Maxfield
7 comments
I feel like I'm juggling a lot of hobby projects at the moment. The problem is that I can't juggle. Actually, that's not strictly true -- I can juggle ten fine china dinner plates, but ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
37 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Karen Field

July Cartoon Caption Contest: Let's Talk Some Trash
Karen Field
139 comments
Steve Jobs allegedly got his start by dumpster diving with the Computer Club at Homestead High in the early 1970s.

Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)