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Computing FFT Twiddle Factors
Some days ago I read a post on the comp.dsp newsgroup and, if I understood the poster's words, it seemed that the poster would benefit from knowing how to compute the twiddle factors of a radix-2 fa...
posted by Rick Lyons on Aug 7 2010 under Tips and Tricks Comments (0) |
Instant CIC
Summary: A floating point model for a CIC decimator, including the frequency response. Description: A CIC filter relies on a peculiarity of its fixed-point implementation: Normal operation involves... 
posted by Markus Nentwig on May 8 2012 under Matlab | Basics | Tips and Tricks Comments (3) |
Delay estimation by FFT
Summary: The delay between a signal and a reference appears in the frequency domain as linear phase shift. It can be estimated with subsample accuracy using FFT methods.This article provides a ...
posted by Markus Nentwig on Sep 22 2007 under Matlab | Basics | Tips and Tricks Comments (23) |
Handling Spectral Inversion in Baseband Processing
The problem of "spectral inversion" comes up fairly frequently in the context of signal processing for communication systems. In short, "spectral inversion" is the reversal of the ... 
posted by Eric Jacobsen on Feb 11 2008 under Tips and Tricks | Wireless | Communication Comments (2) |
A Differentiator With a Difference
Some time ago I was studying various digital differentiating networks, i.e., networks that approximate the process of taking the derivative of a discrete time-domain sequence. By "studying" ...
posted by Rick Lyons on Nov 3 2007 under Tips and Tricks Comments (1) |
Computing the Group Delay of a Filter
I just learned a new method (new to me at least) for computing the group delay of digital filters. In the event this process turns out to be interesting to my readers, this blog describes the method...
posted by Rick Lyons on Nov 19 2008 under Tips and Tricks Comments (7) |
A Stable Goertzel Algorithm
This blog presents a guaranteed-stable Goertzel algorithm. To appreciate what the phrase "guaranteed-stable" means, let's review a few characteristics of the traditional Goertzel algorithm. Goertze...
posted by Rick Lyons on Jun 7 2010 under Tips and Tricks Comments (2) |
Accurate Measurement of a Sinusoid's Peak Amplitude Based on FFT Data
There are two code snippets associated with this blog post: Flat-Top Windowing Function for the Accurate Measurement of a Sinusoid's Peak Amplitude Based on FFT Data and Testing the Flat-Top Wind...
posted by Rick Lyons on Dec 14 2011 under Tips and Tricks Comments (6) |
Linear-phase DC Removal Filter
This blog describes several DC removal networks that might be of interest to the dsprelated.com readers. Back in August 2007 there was a thread on the comp.dsp newsgroup concerning the process of r...
posted by Rick Lyons on Mar 30 2008 under Tips and Tricks Comments (20) |
Improved Narrowband Lowpass IIR Filters
Here's a neat IIR filter trick. It's excerpted from the "DSP Tricks" chapter of the new 3rd edition of my book "Understanding Digital Signal Processing". Perhaps this trick will be of some value to ...
posted by Rick Lyons on Nov 6 2010 under Tips and Tricks Comments (1) |