HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
William K.
User Rank
Platinum
Designing an FIR filter, or any other kind of filter.
William K.   9/9/2013 10:45:24 AM
NO RATINGS
Since creating a filter design would be a very smal portion of my job activities, I would need to find some source of the design, either published or for sale. So presentations like this do wind up being a very useful resource on many occasions.

ttemple
User Rank
Platinum
DFT of coefficients
ttemple   9/6/2013 8:10:52 AM
NO RATINGS
Jon,

I didn't know that performing an FFT on the filter coefficients would produce the same characteristic as the filter.  That is interesting.  I have always used software to produce the coefficients, and somewhat trusted the output.  I do usually verify the overall gain by summing the coefficients, however.

It seems that the FFT output produced by 65 coefficients of 0.015625 is skewed by the zero padding.  I would expect the FFT of a constant value to have all energy content to appear in the 0Hz bin, and absolutely nothing in the other frequency bins.  By padding it out to 128 points with zeroes, you have essentially created a square wave with approximately a 50% duty cycle, and the FFT result looks like it (the odd harmonic content).



Partner Zone
Latest Analysis
With Radio Shack on the ropes, let's take a memory trip through the highlights of Radio Shack products.
We Have FPGAs with On-chip MCUs, but How About MCUs with On-chip FPGAs?
Polish design firm NAS-DRA has proposed parasitic robotic drones that capture carbon dioxide from the air during the day and release it at night to plants growing on their wings.
Computer security firm Norton has partnered with clothing company Betaband on a pair of jeans that will keep your RFID-tagged credit cards and documents safe from wireless theft.
With erupting concern over police brutality, law enforcement agencies are turning to body-worn cameras to collect evidence and protect police and suspects. But how do they work? And are they even really effective?
More:Blogs|News
Design News Webinar Series
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
11/6/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Dec 15 - 19, An Introduction to Web Application Security
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service