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# DSP - Digital Signal Processing - Blogs

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# Setting the 3-dB Cutoff Frequency of an Exponential Averager

This blog discusses two ways to determine an exponential averager's weighting factor so that the averager has a given 3-dB cutoff frequency. Here we assume the reader is familiar with exponential av...

posted by Rick Lyons on Oct 22 2012 under Tips and Tricks

# 'z' as in 'Zorro': Frequency Masking FIR

An efficient way to implement FIR filters. Matlab / Octave example included. Keywords: Frequency masking FIR filter implementation Introduction An "upsampled" FIR filter uses multiple-sample delays ...

posted by Markus Nentwig on Oct 2 2012 under Matlab | Design Methodolgies | Multirate DSP

# Do you like the new Comments System?

I have just finished implementing a new comments system for the blogs.  Do you like it? Please share your thoughts with me by adding a comment. I'll wait a few days and make sure it works pro...

posted by Stephane Boucher on Sep 19 2012 under DSPRelated

# FIR sideways (interpolator polyphase decomposition)

An efficient implementation of a symmetric-FIR polyphase 1:3 interpolator that doesn't follow the usual tapped delay line-paradigm. The example exploits the impulse response symmetry and avoids four ...

posted by Markus Nentwig on Sep 12 2012 under Matlab | Basics | Multirate DSP

# Design of an anti-aliasing filter for a DAC

Overview Octaveforge / Matlab design script. Download: here weighted numerical optimization of Laplace-domain transfer function linear-phase design, optimizes vector error (magnitude and phase) ...

posted by Markus Nentwig on Aug 18 2012 under Matlab | Basics | Wireless

# 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

# Frequency-Domain Periodicity and the Discrete Fourier Transform

Introduction Some of the better understood aspects of time-sampled systems are the limitations and requirements imposed by the Nyquist sampling theorem [1]. Somewhat less understood is the periodic...

posted by Eric Jacobsen on Aug 6 2012 under DFT_FFT

# Time-Domain Periodicity and the Discrete Fourier Transform

Introduction The Discrete Fourier Transform (DFT) and it's fast-algorithm implementation, the Fast Fourier Transform (FFT), are fundamental tools for processing and analysis of digital signals. Whi...

posted by Eric Jacobsen on Jul 13 2012 under DFT_FFT

# Python scipy.signal IIR Filter Design Cont.

In the previous post the Python scipy.signal iirdesign function was disected.  We reviewed the basics of filter specification and reviewed how to use the iirdesign function to design IIR filter...

posted by Christopher Felton on Jun 19 2012 under Basics | Python