... home ...

filters: Definition and Recommended Links

Our favorite links for this topic area. Enjoy, fellow researchers! Questions, comments, new links? Email eewindow@aol.com!.

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:

      Free Online Book: Digital Filter Design

      The purpose of this book is to provide you with different theorethical and practical approaches to digital filter design. The book covers design of both finite and infinite impulse response filters. In addition, it applies the most popular and most commonly used design methodes giving the best solutions. Intuitive explanations and numerous examples contained in this book will help you to devolope your understanding of these methods and test...
      http://www.mikroe.com/en/books/digital-filter-design/

      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/

      Free Codecs

      VIDEO CODECS FFDShow MPEG-4 DivX 6.8 Koepi's XviD Codec DScaler MPEG Filters DivX Free OggDS / OGM Codec Nic's XviD Codec Ligos Indeo Codec · AUDIO CODECS MPEG Layer-3 Codec AC3 Filter AC-3 Decompressor CoreVorbis Decoder LAME DirectShow Filter LAME MP3 Encoder Monkey's Audio Vorbis Ogg ACM Codec · CODEC PACKS XP Codec Pack K-Lite Codec Pack Codec Pack All in 1 Matroska Pack Satsuki Decoder Pack The Codecs K-Lite Mega Codec Lazy Man's MKV Pack
      http://www.free-codecs.com/

      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

      FIR Digital Filter Design Applet

      This JAVA applet allows you to design an FIR filter and view its characteristics. By choosing a window type, the filter order, and passband, you can design the filter and view its frequency response and get a listing of the coefficients. Source code available.
      http://www.dsptutor.freeuk.com/FIRFilterDesign/FIRFilterDesign.html

      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

      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!

Mark Twain quote for the day:

So far as I can see, a procession has value in but two ways - as a show and as a symbol, its minor function being to delight the eye, its major one to compel thought, exalt the spirit, stir the heart, and inflame the imagination. As a mere show, and meaningless - like a Mardi-Gras march - a magnificent procession is worth a long journey to see; as a symbol, the most colorless and unpicturesque procession, if it have a moving history back of it, is worth a thousand of it.
- Queen Victoria's Jubilee