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# Multirate DSP - DSP Blog

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# Polyphase Filters and Filterbanks

ALONG CAME POLY Polyphase filtering is a computationally efficient structure for applying resampling and filtering to a signal. Most digital filters can be applied in a polyphase format, and it is al...

posted by Kyle Kastner on Mar 19 2013 under Multirate DSP | Python | DFT_FFT

# '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

# 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

# The History of CIC Filters: The Untold Story

If you have ever studied or designed a cascaded integrator-comb (CIC) lowpass filter then surely you've read Eugene Hogenauer's seminal 1981 IEEE paper where he first introduced the CIC filter to th...

posted by Rick Lyons on Feb 20 2012 under Multirate DSP

# Design study: 1:64 interpolating pulse shaping FIR

This article is the documentation to a code snippet that originated from a discussion on comp.dsp. The task is to design a root-raised cosine filter with a rolloff of a=0.15 that interpolates to 64x...

posted by Markus Nentwig on Dec 26 2011 under Matlab | Basics | Multirate DSP

# Bank-switched Farrow resampler

Bank-switched Farrow resampler Summary A modification of the Farrow structure with reduced computational complexity.Compared to a conventional design, the impulse response is broken into a higher nu...

posted by Markus Nentwig on Aug 13 2011 under Matlab | Basics | Multirate DSP

# Do Multirate Systems Have Transfer Functions?

The following text describes why I ask the strange question in the title of this blog. Some months ago I was asked to review a article manuscript, for possible publication in a signal processing jou...

posted by Rick Lyons on May 30 2011 under Multirate DSP