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Analog & DSP, FIR Electronic Filters - Frequency Devices

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   Filters, Continuously Variable

Electronic filters are electronic circuits which perform signal processing functions, specifically intended to remove unwanted signal components and/or enhance wanted ones. Electronic filters or audio filters can be:

  • passive or active
  • analog or digital
  • discrete-time (sampled) or continuous-time
  • linear or non-linear
  • infinite impulse response (IIR type) or finite impulse response (FIR type)

The most common types of electronic filters are linear filters, regardless of other aspects of their design. See the article on linear filters for details on their design and analysis.



Bronze Partners
Aeroflex Laboratories Inc
Allen Avionics, Inc.
Alligator Technologies
Analogic DCP
Anatech Electronics, Inc.
Avens Signal Equipment Corp.
Ballantine Laboratories
Control Concepts Corporation
Corcom Products
E G & G Optoelectronics-Reticon
E.A.G.L.E., Inc.
Electrocube, Inc.
Integration Assocs. Inc.
JDS Uniphase Corporation
K & L Microwave, Inc.
Krohn-Hite Corp.
Linear Technology Corp.
Pole/Zero Corp.
Precision Filters, Inc.
Pulizzi Engineering, Inc.
R. C. Electronics Inc.
RFI Corp.
Stanford Research Systems, Inc.
Television Equipment Associates
Toko America, Inc.
Trilithic, Inc.
Analog & DSP, FIR Electronic Filters - Frequency Devices

 

Books
Optimizing a continuously variable filter in a hybrid optical correlator (SuDoc NAS 1.15:89279)
Richard D. Judey

World Radio Tv Handbook 2005: The Directory of International Broadcasting (World Radio TV Handbook)
Sean Gilbert

Excerpt - Front Matter: "... tools for interference reduction including two noise blankers, a notch filter, continuously variable bandwidth control, passband shift and excellent facilities for ECSS reception. ..."
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Encyclopedia of Electronic Circuits, Volume 7
Rudolf F. Graf and William Sheets

Excerpt - page 58: "... S1 functioning as a polarity inverter. A 24-dB-per-octave switched capacitor filter (ICI) is the heart of the continuously variable filter. Potentiometer R13 controls the cutoff frequency of IC1 by ..."
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Mastering Audio: The Art and the Science
Bob Katz

Excerpt - page 232: "... contain asynchronous sample-rate converters (ASRC). These types of SRCs use variable filters based on a continuously- running estimate of the incoming sample rate, and thus are ..."
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Detection Technologies for Chemical Warfare Agents and Toxic Vapors
Yin Sun and Kwok Y. Ong

Excerpt - page 174: "... volume of 2.23 L. The 100E has seven fixed bandpass filters and one continuously variable filter (7.7 to 14.1 microns) together with two selectable path ..."
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Process Analytical Technology: Spectroscopic Tools and Implementation Strategies for the Chemical and Pharmaceutical Industries
Katherine A. Bakeev

Excerpt - page 105: "... these applications, a mechanical device is required to drive the filter assembly. The reproducibility and reliability ... available, and filter clusters and continuously variable filters can be integrated with these arrays to form a ..."
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Lighting Control: Technology and Applications
Robert Simpson

Excerpt - page 56: "... Various methods can be used: e introduction of a continuously variable filter. This could consist of a film which is transparent at ..."
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Care of Astronomical Telescopes and Accessories: A Manual for the Astronomical Observer and Amateur Telescope Maker (Patrick Moore's Practical Astronomy Series)
M. Barlow Pepin

Excerpt - page 89: "... Optical Accessories gq Figure 5.10. Dichroic filters: a continuously Variable Color Filter and three eyepiece filters by Sirius Optics. Contrast ..."
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What's a Mixer?: A Basic Guide to Their Features and Functions (What's A...)
William Philbrick

Excerpt - Back Matter: "... cuts specific frequencies in the audio spectrum. Also known as Filter. Fader: A continuously variable level control. Gain: A voltage or power increase (depending on ..."
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Environmental Analytical Chemistry
F. W. Fifield and P. J. Haines

Excerpt - page 329: "... of appropriate wavelength, or a broad-band source with a suitable filter, may be used. Most gas analysers are of the nondispersive type (NDIR or NDUV). Although some non-dispersive analysers incorporate continuously variable filters to allow measurement of several gases, the majority are ..."
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Non-LTE Radiative Transfer in the Atmosphere, (Series on Atmospheric, Ocean and Planetary Physics, Vol. 3) (Series on Atmospheric, Oceanic and Planetary Physics)
M. Lopez-Puertas, F. W. Taylor, and M. Lopez Puertas

Excerpt - page 264: "... features of a large range of constituents (Fig. 8.2). A continuously-variable filter covered the range 1.4-16.5ith spec- tral resolution of AA ..."
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Theory and Applications of Optical Remote Sensing (Wiley Series in Remote Sensing and Image Processing)
Ghassem Asrar

Excerpt - page 36: "... four-stage thermoelectrically cooled (to -50lead-sulfide detector and a three-segment continuously variable filter. All operations were automatic through a preprogrammed microprocessor unit. The ..."
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Astronomie spatiale infrarouge, aujourd'hui et demain Infrared space astronomy, today and tomorrow: 3-28 August 1998 (Les Houches - Ecole d'Ete de Physique Theorique)
F. Casoli, J. Lequeux, and F. David

Excerpt - page 65: "... criterion. The second wheel holds a dozen discrete band pass filters with spectral res- olution ranging from 2 to 15, and continuously variable filters (CVF) with spectral resolution of 45. The sixth wheel, ..."
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Exploration of the Solar System by Infrared Remote Sensing
R. A. Hanel, B. J. Conrath, D. E. Jennings, and R. E. Samuelson

Excerpt - page 208: "... in Subsection 5.8.a, Eq. (5.8.11). All Fabry-Perot interferometers and interference filters of the type discussed so ... surfaces, serves that purpose. A continuously variable filter (CVF) may also be obtained by depositing the individual ..."
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Techniques in Glycobiology
R. Reid Townsend and Arland T. Hotchkiss

Excerpt - page 54: "... 3 Hz was used; attenuation was adjusted by a computer-controlled continuously variable density filter. The beam flux was usually near the threshold of ion ..."
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Trade-Offs in Analog Circuit Design
Chris Toumazou, George S. Moschytz, and Barrie Gilbert

Excerpt - page 304: "... simultaneously, not taking into account the envelope delay in the filter [35]. To eliminate this distortion, it is necessary to control the state variables of the filter [37]. For continuously varying g, it has been shown that this can be ..."
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Oxygen Sensing, Volume 381 (Methods in Enzymology)
Chandran K. Sen and Gregg L. Semenza

Excerpt - page 698: "... stages, a diaphragm or rotating "venetian blind" louver 5 for continuously varying the intensity followed by, or preceded by, a holder for neutral density filters. The former is continuously variable, but cannot be used readily to make precise and reproducible ..."
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Frontiers in Neutron Capture Therapy
M. Frederick Hawthorne, Kenneth Shelly, and Richard J. Wiersema

Excerpt - page 166: "... day and after high dose irradiation) attening and wedge filter b>continuously variable) radiation field gular position of gantry gular position ..."
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Adaptive Optics in Astronomy
Francois Roddier

Excerpt - Back Matter: "... Central Processor Unit. CS Curvature Sensor (see Chapter 5). CVF Continuously Variable Filter. A tunable optical filter used in cameras. CW Continuous Wave. ..."
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Practical Methods in Cardiovascular Research
Stefan Dhein, Friedrich Wilhelm Mohr, and Mario Delmar

Excerpt - page 244: "... 100. Amplified signals are passed through low-pass 4th order Bessel filters with continuously variable cut-off frequency . Because of the relatively slow roll-off of ..."
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Jane's Police and Security Equipment 2004-2005 (Jane's Police and Security Equipment)
Mike McBride

Excerpt - page 152: "... ergonomic design of the unit is combined with advanced camera, filter and lighting elements coupled to ... 1,000 nm Secondary filter slide: continuously variable linear IR filters 400 nm to 1,000 nm Manufacturer KAPPA ..."
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Speech Acoustics and Phonetics: Selected Writings (Text, Speech and Language Technology)
Gunnar Fant

Excerpt - Back Matter: "... XXXVII, Fasc. 5. 462-469. 1950 1. Fant, G. (1950). A continuously variable filter. J. Acoust. Soc. Amer. 22, 449-453. 2. Fant, G. (1950). ..."
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Jane's Police and Security Equipment 2005-06 (Jane's Police and Security Equipment)
Mike McBride

Excerpt - page 161: "... ergonomic design of the unit is combined with advanced camera, filter and lighting elements coupled to ... 1,000 nm Secondary filter slide: continuously variable linear IR filters 400 nm to 1,000 nm DPS3 multi-spectral ..."
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Electronic Filters, Amplifiers & Oscillators - Frequency Devices
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