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
Gold
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
Your cat demands to be fed on time. With some technical know-how and a 3D printer you can build your own automated cat food dispenser.
At the Design and Manufacturing show in Minneapolis last week, Myst creator Chuck Carter spelled out the future for Virtual Reality: content.
Researchers at the Georgia Institute of Technology have developed fabric that can simultaneously harvest energy from both sunshine and motion.
Kickstarter offers a gazillion ideas for businesses that are seeking start-up funding. The crowdfunding site also features new gadgets from companies struggling to get their product out to customers. We took a look at the gadgets currently featured and found a number of cool ideas that are seeking funding angels.
Design and manufacturing need each other -- and the engineers behind them. Donít forget that.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 12 - 16, Analytics for the IoT: A Deep Dive into Algorithms
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


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.
Next Course June 28-30:
Sponsored by Stratasys
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service