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Python scipy.signal IIR Filtering: An Example

Introduction In the last posts I reviewed how to use the Python scipy.signal package to design digital infinite impulse response (IIR) filters, specifically, using the iir...

posted by Christopher Felton on May 19 2013 under Audio DSP | FPGA | Basics | Tips and Tricks | Python

A Quadrature Signals Tutorial: Complex, But Not Complicated

posted by Rick Lyons on Apr 12 2013 under Basics | Communication | Tutorial

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

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

A Fixed-Point Introduction by Example

Fixed-point is used to represent fractional numbers of finite-word length.  Fixed-point is an interpretation of a 2's compliment number usually signed but not limited to sign representation. &nbs...

posted by Christopher Felton on Apr 25 2011 under FPGA | Basics

An Interesting Fourier Transform - 1/f Noise

Power law functions are common in science and engineering. A surprising property is that the Fourier transform of a power law is also a power law. But this is only the start- there are many interest...

posted by Steve Smith on Nov 23 2007 under Academia / Research

Python scipy.signal IIR Filter Design

Introduction The following is an introduction on how to design an infinite impulse response (IIR) filters using the Python scipy.signal package.  This post, mainly, covers how to use the scipy...

posted by Christopher Felton on May 13 2012 under Basics | Python

Polyphase filter / Farrows interpolation

Hello, this article is meant to give a quick overview over polyphase filtering and Farrows interpolation. A good reference with more depth is for example Fred Harris' paper: http://www.signumconce...

posted by Markus Nentwig on Sep 18 2007 under Basics

Understanding the 'Phasing Method' of Single Sideband Demodulation

Download the pdf version There are four ways to demodulate a transmitted single sideband (SSB) signal. Those four methods are: synchronous detection, phasing method, Weaver method, and filter...

posted by Rick Lyons on Aug 8 2012 under Communication