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filters: Definition and Recommended Links

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In electronics, a digital filter is any electronic filter that works by performing digital mathematical operations on an intermediate form of a signal. This is in contrast to older analog filters which work entirely in the analog realm and must rely on physical networks of electronic components (such as resistors, capacitors, transistors, etc.) to achieve the desired filtering effect.
Digital filters can achieve virtually any filtering effect that can be expressed as a mathematical function or algorithm. The two primary limitations of digital filters are their speed (the filter can't operate any faster than the computer at the heart of the filter), and their cost. However as the cost of integrated circuits has continued to drop over time, digital filters have become increasingly commonplace and are now an essential element of many everyday objects such as radios, cellphones, and stereo receivers.
Source: Wikipedia (http://en.wikipedia.org/wiki/Digital_filters)

other great electronics sites:ee toolbox site

- filters
  - In electronics, a digital filter is any electronic filter that works by performing digital mathematical operations on an intermediate form of a signal. This is in contrast to older analog filters which work entirely in the analog realm and must rely on physical networks of electronic components (such as resistors, capacitors, transistors, etc.) to achieve the desired filtering effect.
    Digital filters can achieve virtually any filtering effect that can be expressed as a mathematical function or algorithm. The two primary limitations of digital filters are their speed (the filter can't operate any faster than the computer at the heart of the filter), and their cost. However as the cost of integrated circuits has continued to drop over time, digital filters have become increasingly commonplace and are now an essential element of many everyday objects such as radios, cellphones, and stereo receivers.
    Source: Wikipedia (http://en.wikipedia.org/wiki/Digital_filters)
    (Note: The Electronic Engineers Toolbox provides an alternative set of featured links for this word at http://www.cera2.com/filters.htm)
    Featured Links:
    
    Introduction to Digital Filters With Audio Applications
    Introduction to Digital Filter Analysis Motivating Example and Overview FIR Filters Convolution Representation of LTI Filters Finiteness Causal FIR Filters Transfer Function Order
    http://www-ccrma.stanford.edu/~jos/filters/
    
    ScopeFIR Download
    ScopeFIR designs Complex Finite-Impulse Response (FIR) filters using the Parks-McClellan algorithm or windowing. You can then mix, scale, quantize, and edit the coefficients of the FIR filter. You may use ScopeFIR free for a 60-day trial period, but you must Register with Iowegian International Corporation in order to use it beyond the trial period. The full licensing terms for the program, plus additional information about Registration can...
    http://www.iowegian.com/download/loadfir.htm
    
    Digital Filters: An Introduction
    This tutorial is a good, in-depth, yet easy to understand, explanation of digital filters. It includes digital filters' advantages, types, parameters, and it also has examples of simple filters. The site is HTML and the tutorial is also available as a PDF file.
    http://www.dsptutor.freeuk.com/dfilt1.htm
    
    Digital Filter Design & Simulation Digital Filter Design & Simulation : Free DISPRO Software
    DISPRO is a professional-level software package for designing digital filters, and for evaluating the performance of the digital filter when it is implemented with the actual arithmetic characteristics of the target DSP processor. DISPRO was the first commercially available digital filter design package for the IBM PC, having been introduced in 1983. It was marketed around the world by Signix Corporation, and is now being offered as...
    http://www.digitalfilterdesign.com/
    
    Digital Filters @ Wikipedia
    In electronics, a digital filter is any electronic filter that works by performing digital mathematical operations on an intermediate form of a signal. This is in contrast to older analog filters which work entirely in the analog realm and must rely on physical networks of electronic components (such as resistors, capacitors, transistors, etc.) to achieve the desired filtering effect. Digital filters can achieve virtually any filtering...
    http://en.wikipedia.org/wiki/Digital_filter
    
    Introduction to DSP - IIR Filters
    This is the fifth module of the BORES Signal Processing DSP course - Introduction to DSP. It covers the following subjects: * IIR filter equations and frequency response * the z transform * the meaning of z * poles and zeroes * IIR filter design by impulse invariance * IIR filter design by the bilinear transform * direct form I and II filters * quantisation in IIR filters * IIR filter implementation structures
    http://www.bores.com/courses/intro/iir/
    
    Introduction to Digital Filters
    From introductory course in digital audio signal processing, which I have given at the Center for Computer Research in Music and Acoustics (CCRMA) since 1984. The course was created primarily as a first course in digital signal processing for entering Music Ph.D. students in the Computer Based Music Theory and Acoustics program. This book will emphasize audio and music applications . . .
    http://ccrma.stanford.edu/~jos/filters/
    
    eASIC Accelerates DSP Market Momentum with New IP cores
    eASIC Corporation, a provider of NEW ASIC devices, today announced the immediate availability of two new DSP IP cores, an FFT and FIR Filter Compiler, to accelerate it’s growing momentum into the high performance DSP market. The new FFT core, available from eASIC, supports point sizes from 16 to 16K points and data rates up to 100 MSPS with a compact footprint. The FIR Compiler core, available from eZ-IP Alliance partner Steepest Ascent can...
    http://www.easic.com
    
    FIR Filter FAQ
    This is a FAQ gives answers to questions about FIR filters, including the basics, FIR design, and links to related information.
    http://www.dspguru.com/info/faqs/firfaq.htm
    
    Digital Filter on the Web
    This personal page is a collection of tools created by the author to aid in digital filter design. Various JAVA applets allow the user to define and analyze IIR and FIR filters. The page also includes information for registration of the shareware tools to turn off any limitations.
    http://www.digitalfilter.com/
    
    Explanation: these links are provided as part of our EE glossary project, which seeks to identify the most prominent keywords in embedded systems, embedded software, realtime and rtos, dsp (digital signal processing), system-on-a-chip, microprocessors and microcontrollers, and other constituent elements for embedded systems. While we seek to keep most of the links up-to-date, the user is refered to other primary electronic-based search sites such as: cera2.com, embedded.com, or EDN Magazine. If you have any suggestions of links or definitions, please email!

Last updated: Sun Jun 21 2009
Creator: Luis Viterbo, Web Surfer and Professional Engineer, email

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