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# Topic: Digital filter

###### In the News (Fri 24 May 19)

 Digital Filter Design (DSP Blockset) The block applies the specified filter to each channel of a discrete-time input signal, and outputs the result. The outputs of the block numerically match the outputs of the Digital Filter block, the The sampling frequency, Fs, you specify in the FDATool GUI should be identical to the sampling frequency of the Digital Filter Design block's input block. www.mathworks.com /access/helpdesk_r13/help/toolbox/dspblks/digitalfilterdesign.html   (563 words)

 Digital Filter A digital filter is any digital-computing means that accepts as its input a set of one or more digital signals from which it generates as its output a second set of digital signals. By controlling the accuracy of the calculations within the filter (that is, the arithmetic word length), it is possible to produce filters whose performance comes arbitrarily close to the performance expected of the perfect models. These filters are called adaptive because they adapt their parameters in response to changes in the operating environment. www.data-acquisition.us /digital-filter.html   (550 words)

 Digital Signal Processing Filter Terminology Digital filtering can be in the form of a software routine operating on data stored in computer memory or can be implemented with dedicated digital hardware. For an FIR filter, the filter coefficients are, by definition, the impulse response of the filter. A particular digital filter may be said to have a rolloff of 12 dB/octave—meaning that the first octave of a frequency fo, or 2fo, would be attenuated by 12 dB more than the filter's attenuation at fo. www.dspguru.com /info/terms/filtterm/index2.htm   (2987 words)

 Digital Filter Design Software -- DISPRO DISPRO could be used to design FIR filters with arbitrary magnitude characteristics, but IIR filters with arbitrary characteristics required the use of numerical optimization methods which often did not yield useful results, and usually were not interactive. 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. For IIR filters the sinusoidal response for all state variables can be plotted on either a linear or dB scale — this serves primarily to indicate the superior overflow performance of the merged-biquad IIR filter implementation. www.digitalfilterdesign.com   (714 words)

 TechOnline | Digital Filters: An Introduction Digital filters do not suffer from these problems, and so are extremely stable with respect both to time and temperature. As the speed of DSP technology continues to increase, digital filters are being applied to high frequency signals in the RF (radio frequency) domain which, in the past, was the exclusive preserve of analog technology. Digital filters are very much more versatile in their ability to process signals in a variety of ways. www.dspdesignline.com /showArticle.jhtml?articleID=192200474   (2713 words)

 Digital Filters by Nuhertz Technologies The number of significant digits may be specified for decimal outputs, the number of significant bits may be specified for binary formats, and the maximum range may be specified for fixed point. When you have completed your filter study and are ready to generate code for your filter, you must set the Sig Dig box to the desired number of digits (1-16) to display the Z transform in. Filter Solutions provides you with a Z transform and C autocode to create your digital filter. www.filter-solutions.com /digital.html   (1562 words)

 Digital Filter Design Some examples are a linear phase filter that provides steep rolloff characteristics or a programmable digital filter that allows the signal conditioning to be changed on the fly via software. These implementations are referred to as IIR filters because, when a short impulse is put through the filter, the output value does not converge quickly to zero but theoretically continues decreasing over an infinite number of samples. Digital filters primarily are used when transfer-function requirements have no counterpart in the analog world or when a DSP already resides on the circuit board to perform other functions. www.evaluationengineering.com /archive/articles/1103data.htm   (2376 words)

 Filter options for digital cameras And since most digital cameras are considerably less UV-sensitive than film, ordinary UV filters seldom deliver a benefit worth the added risk of flare, but cameras prone to purple fringing artifact may be an exception. The much more common round filters are generally better suited for everyday use, but square filters have their virtues, particularly when it comes to special effects to be applied to only part of the camera's field of view. A good quality multicoated neutral UV filter is as good a choice as any for a lens protector if you feel compelled to use one, but don't expect to see much of a benefit in your digital images. dpfwiw.com /filters.htm   (9502 words)

 Digital Filters: An Introduction (1) In signal processing, the function of a filter is to remove unwanted parts of the signal, such as random noise, or to extract useful parts of the signal, such as the components lying within a certain frequency range. A digital filter uses a digital processor to perform numerical calculations on sampled values of the signal. Note that in a digital filter, the signal is represented by a sequence of numbers, rather than a voltage or current. www.dsptutor.freeuk.com /dfilt1.htm   (329 words)

 Frequently Asked Questions (FAQs) - Products and Services - National Instruments For filter design, this could mean anything from a simple one-shot application that quickly implements a single design to a larger application that iterates over filter specifications, design methods, and so on to create a filter that exactly fits your needs. Digital filters act on discrete signal samples and are implemented algorithmically using software. Analog filters act on a continuously varying (analog) signal and are implemented with discrete electronic components such as capacitors, inductors, and op amps. www.ni.com /toolkits/df_design_toolkit_faq.htm   (1316 words)

 digital filter- Developer Zone - National Instruments A filter that is built by converting the analog signals to digital values, and then implementing the filter using digital circuits, such as delay lines, accumulators, and feedback elements. One of the problems most of us encounter when designing and using digital filters is that, at least at the start, their forms and functions are not intrinsically intuitive. Previously it was stated that one way to start the design of a digital filter is to recall the design, or some aspects of the design, of an analog filter and adapt those principles to the digital world. zone.ni.com /devzone/cda/tut/p/id/948   (3064 words)

 Digital Power Filter - FAQ The Digital Cable Filter connects to the input side of the digital box where the incoming cable link is connected. Yes, the filter is to be used as a digital signal booster to enhance your digital cable. Once the digital cable filter is connected it should not be removed unless the digital cable box is unplugged first. www.descramble-it.com /digital-cable-filters-faq.htm   (223 words)

 Part II: Digital Filters It is important to realize that a digital filter is a completely different animal than an analog filter. The number of taps of a digital filter are related to the slope, but the slopes are very dependent on the cutoff frequency. It is easy to to achieve a perfect phase response with a digital filter, and impossible to achieve with any analog filter of order greater than one. www.silcom.com /~aludwig/Signal_processing/Digital_filters.htm   (1294 words)

 Digital Filter sales digital cable descrambler filter digital cable filters This Cable Filter is meant for use on cable systems, when attached, it blocks the PPV signal that's sent to the cable company for billing. Recently there has been a major increase in demand for the digital cable filters due to their ability to block outgoing signals such as PPV ordering information from most residential digital cable terminals. This information and digital cable filter are only to be used by legitimate cable technicians and/or for educational purposes only. www.digitalfiltersales.com   (891 words)

 Cable Filter Digital Descrambler Resource Information Home Message: Hey i received my filter about a month and a half ago, even tho i did the tests that came with it to make sure it works, i still wasnt sure, so i waited until my bill came to check it, and everything worked out like it should. This is the filter that is in high demand because of it's ability to allow the user free Pay-Per-View movies and Pay-Per-View channels with the purchases never showing up on the bill. Recently there has been a major increase in demand for the filters due to their ability to block outgoing signals such as PPV ordering information from most residential digital cable terminals. www.cableboxfilters.com   (1156 words)

 Circuit Sage: Filter Design and Analysis Digital filter design applets by Jeffrey Taft; 38 cool free digital filter design applets plus tutorials. MicroSim Filter Designer Software: This PC demo version only allows up to third order filters to be designed. Anasoft's Fantastic filter (part of Super Spice), High and Low Pass Ladders and Opamp Sallen-Key filters for all filter types, up to 17th order. www.circuitsage.com /filter.html   (1081 words)

 Filter Solutions, Analog and Digital Filter Design Software Filter Solutions, Filter Light, and Filter Free are comprehensive PC windows based filter synthesis and analysis software packages for passive, transmission line, active, switched capacitor, and digital filters. Filter Light is the low cost version with expanded capabilities over Filter Free, and Filter Solutions is the fully functional version. FIR arithmetically symmetric raised cosine and root raised cosine filters. www.filter-solutions.com   (1204 words)

 Digital cable box reset information.Information for digital cable box reset. Digital cable box reset information.Information for digital cable box reset. This Reset information is for individuals that have purchased a filter from another company and were not supplied with reset information.If you purchased your filter from Digitalfiltersales, You were provided with access to this infromation, free of charge, with your order. This is reset information used to reset your digital cable box memory, It is sold for educational purposes only. www.digitalfiltersales.com /reset.html   (186 words)

 16 x Digital Filter Our new Digital Filter is built to our specifications and standards, and is designed to get the most out of the Platinum DAC modules. The digital filter is necessary because mirrored image frequencies created during the conversion process must be removed. Sample Rate conversion is also detrimental to the sound due to the complex and sub optimal digital filters involved, which must change their filter response to track minute changes in the input to output clock ratio. msbtech.com /products/16xdf.php   (1736 words)

 Digital Filter Design Software Fiwiz This approach designs filters by using poles and zeros as parameters which are automatically evolved to meet the constraints set forth by the user. Applications are mainly classical lowpass, highpass, bandpass, and bandstop filters which should exhibit approximately linear phase in the passband(s) but not necessarily in the stopband(s). For the classical filter design methods (butterworth, chebyshev, inverse chebyshev, elliptical) the quantization is applied after the filter has been designed (as most common off-the-shelf filter design programs do). www.icsi.berkeley.edu /~storn/fiwiz.html   (1005 words)

 Numerix Ltd. Digital Filter Plus Digital Filter Plus™ (V2.40) - released 1st July 2007 Digital Filter Plus is an Finite Impulse Response (FIR) and Infinite Impulse Response (IIR) digital filter design program that runs under Windows™ and Linux™. The demonstration mode does not allow allow the filter coefficients to be saved to disk but this feature is enabled by the purchase of a developer's license. www.numerix-dsp.com /dfplus   (167 words)

 NI Digital Filter Design Toolkit for LabVIEW - Products and Services - National Instruments The National Instruments Digital Filter Design Toolkit extends LabVIEW with functions and interactive tools for design, analysis, and implementation of digital filters. If you are new to digital filters, you can use interactive design tools to rapidly explore classical designs; if you are experienced with digital filters, you can use a breadth of algorithms, filter topologies, and analysis tools for design, modeling, and implementation of both fixed- and floating-point digital filters. Test-drive the NI Digital Filter Design Toolkit using the fully functional evaluation of the LabVIEW development environment, complete with select LabVIEW add-ons. www.ni.com /toolkits/df_design_toolkit.htm   (455 words)

 Digital Filters Applet   (Site not responding. Last check: ) This java applet is a demonstration of digital filters. It shows the frequency response of the filter, the spectrum of the filtered waveform being played, the waveform itself, and the impulse response of the filter. Thanks to Digital Droo for the Monkey Developers sample. www.falstad.com /dfilter   (151 words)

 DIGITAL_FILTER Highpass, lowpass, bandpass and bandstop filters may be constructed with this function. The lower frequency of the filter as a fraction of the Nyquist frequency The upper frequency of the filter as a fraction of the Nyquist frequency. www.physik.uni-augsburg.de /ci/rs6k/sw/idl/idl7c.htm   (115 words)

 [No title] The filter should be located between your cable wire and the digital cable box. Some people are told to never remove the filter, and then 2 months later their box locks up, they don’t know why, and get stuck with a huge bill, hence all the rumors that the filters don’t work and people get stuck with huge bills at the end. Your best bet is to occasionally reset the box and remove the filter (preferably after 5 movies OR about every 2 weeks) and remove the filter on the 3rd 17th and the 22nd of each month. www.camnix.com /filter/digitalfilter.doc   (4611 words)

 Agilent | E8825A Digital Filter E8825A Digital Filter makes it possible to move easily from filter specification to synthesizable schematic implementation. Digital filter characteristics such as frequency response, phase response and impulse response can be analyzed graphically. E8825A Digital Filter also allows you to compare floating point and fixed point filter performance for any user specified bit width. eesof.tm.agilent.com /products/e8825a-new.html   (316 words)

 Interactive Digital Filter Design This is an interactive filter design package, for designing digital filters. I've been advised to say that, although I believe the package to be bug-free, you use the results at your own peril, and you're advised to check them for correctness before using them. Here are some references to textbooks which will tell you about digital filters, the differences between the various types, the bilinear transform method, etc. www-users.cs.york.ac.uk /~fisher/mkfilter   (362 words)

 NI LabVIEW Digital Filter Design Toolkit - Products and Services - National Instruments The National Instruments Digital Filter Design Toolkit extends LabVIEW with functions (LabVIEW VIs that you install into the palette) and interactive tools for design, analysis, and implementation of digital filters. Users who are new to digital filters can use the built-in interactive design tools to explore classical designs; experienced users will find a breadth of algorithms, filter topologies, and analysis tools for both fixed and floating-point digital filters. For fixed-point filters, users can model quantization effects, optimize numeric representation/topology, and finally deploy the design on a DSP or FPGA using automatically generated ANSI C or LabVIEW FPGA code. sine.ni.com /nips/cds/view/p/lang/en/nid/14890   (187 words)

 Digital Filter Design   (Site not responding. Last check: ) The Digital Filter Design tool for the dsPIC®16-bit DigitalSignal Controllers makes designing, analyzing andimplementing Finite Impulse Response (FIR) and InfiniteImpulse Response (IIR) digital filters easy through a menudrivenand user intuitive interface. The filter design toolperforms complex mathematical computations for filterdesign, provides superior graphical displays and generatescomprehensive design reports. Desired filter frequencyspecifications are entered and the tool automaticallygenerates the filter code and coefficient files ready to usein the MPLAB® Integrated Development Environment (IDE).System analysis of the filter transfer function is supportedwith multiple generated graphs such as: magnitude, phase,group delay, log magnitude, impulse response and pole/zerolocations. www.microchip.com /stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en010066   (204 words)

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