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Topic: Bandpass

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	audio gear reviews - Enclosure Design - Bandpass Enclosures
		Bandpass enclosures differ from the rest of the enclosures in that all of the acoustical output is radiated from a vent or port.
		Sealed bandpass enclosures are sealed enclosures with the output filtered though a secondary tuned enclosure.
		Series bandpass enclosure differ from the two previous bandpass enclosures in that the low frequency limit of the woofer can be excursion limited by the tuned port that is vented to the outside of the enclosure.
	www.audiogearreviews.com /tech/theory/enclosure_design/bandpass.asp (1248 words)

	Bandpass Calibration
		Bandpass calibration is necessary to correct for complex gain variations as a function of frequency.
		The shape of the bandpass is determined by the baseband filters as most other components have a flat response as a function of frequency.
		Sufficient duration implies that the signal-to-noise ratio reached on the bandpass calibrator in a channel for a particular baseline is at least as high as that on the target object.
	www.vla.nrao.edu /astro/guides/sline/current/node15.html (613 words)

	bandpass filter at Filtronetics, Inc.
		A bandpass filter transfers energy from the source to its load in a select band of frequencies between the lower cutoff frequency and the upper cutoff frequency.
		Anatol Zeverev defines a bandpass filter as a filter that "passes the package of waves from certain lower to upper frequency limits and stops all energy out side these two limits.
		The LC or lumped element bandpass filter is comprised of inductors and capacitors.
	www.filtro.net /bandpass_filter.html (948 words)

	diyAudio Forums - Bandpass Subwoofers
		Now, of course their are applications where a bandpass alignment can be used succesfully.....such as low price mini subwoofers for computers, etc. that can use a very cheap high q woofer, slap it in bandpass box and get ALOT of low quality bass output to impress gamers on a budget.
		Bandpass boxes could be used, with small size and high quaity sound if they were done using an isobaric woofer configuration internally, but again...this would raise cost.
		In your example, the bandpass may very well be desirable over the sealed, since with that particularly very high Q motor on the audax, it would not have very much usable LF extension in a closed box, and is not usable in a ported box(less you want the poorest transient response possible).
	www.diyaudio.com /forums/showthread.php?postid=33187 (1851 words)

	Sealed Rear Chamber Bandpass Sub Woofer Design Tips
		One of the reasons bandpass enclosures are so popular is this inherent property that allows the designer the flexibility to trade bandwidth for efficiency or vice versa.
		Bandpass enclosures create standing waves in the front chamber of the enclosure which cause peaks in the frequency response.
		I do not put damping material in the front chamber of bandpass enclosures because it can shift around in the enclosure and interfere with vent operation unless it is very securely attached.
	www.carstereo.com /help2/articles.cfm?id=25 (920 words)

	Kurzweil:Two-pole Bandpass - Sonikmatter
		The Two-pole Bandpass Filter is a 2 block bandpass filter where both the frequency and the bandwidth can be adjusted.
		By modulating the frequency and bandwidth the bandpass filter can be used as an alternative to a resonant lowpass filter for analog synth sounds.
		Bandpass filters are also used in glitch music to create the chaotic filtered beats, and can be combined in series with a resonant lowpass or highpass filter to create a resonant bandpass filter, if the frequencies of the two filters are modulated and set the same.
	sonikmatter.com /wiki/Kurzweil:Two-pole_Bandpass (159 words)

	Bandpass
		Thin film bandpass filters are optical elements that are designed to transmit a specific spectral band with high efficiency, while rejecting, by both absorption and reflection, all unwanted energy outside that region.
		The characteristics of the bandpass are controlled by multilayer dielectric coatings.
		The bandpass and blocking elements are laminated (epoxied) together to form a single unit and then edge sealed to prevent degradation due to moisture.
	www.escoproducts.com /html/bandpass.html (168 words)

	crystal bandpass filter at Filtronetics, Inc.
		The crystal bandpass filter is used when a narrow bandpass filter with low insertion loss is required.
		Monolithic bandpass crystal filters (MCF) are typically restricted to bandwidths less than 0.4% of center frequency and a center frequency less than 150 MHz.
		Crystal bandpass filters can be packaged in surface mount (SMD), through-hole, and with connector (BNC, TNC, SMA or N) versions.
	www.filtro.net /content/crystal_bandpass_filter.html (516 words)

	Nikon MicroscopyU: Fluorescence Microscopy - Blue-Violet Excitation Filter Combinations - CFP
		Although primarily designed for imaging of fluorescent proteins, this bandpass emission combination is useful for obtaining images of specimens having multiple labels when one of the fluorophores is efficiently excited in the blue-violet spectral region.
		The excitation bandpass of the CFP combination does not generally excite yellow fluorescent protein (excited at 513 nanometers), and by employing a bandpass emission filter, yellow fluorescence is excluded from detection when the CFP filter set is used.
		Although the intracellular microtubule network is heavily stained using this protocol, the bandpass filter in the CFP combination does not pass a large amount of fluorescence emission from Alexa Fluor 430, and produces only a weak signal that is concentrated near the nucleus.
	www.microscopyu.com /articles/fluorescence/filtercubes/blueviolet/cfp/cfpindex.html (1237 words)

	Optical filters from Barr Associates - Types of optical filters: absorption filters bandpass filters beamsplitters beam ... (Site not responding. Last check: 2007-10-31)
		Whether the requirement is for a UV bandpass filter, a narrowband filter in the visible spectrum with several angstroms bandwidth, or for a wideband filter in the infrared spectrum with several microns bandwidth, Barr has the engineering and manufacturing capability to meet the challenge.
		Bandshape: Barr offers multi-cavity bandpass filters where the shape of the passband is square-like, the slopes are steep, and blocking is deep near the passband.
		Temperature Stability: Using Barr's stable oxide interference coatings, bandpass filters are fabricated with a high degree of temperature stability.
	www.barrassociates.com /opticalfilters.php?type=bandpass (802 words)

	Design of a UWB Low Insertion Loss Bandpass Filter with Spurious Response Suppression \| February ...
		Planar bandpass filters, with a wide bandwidth of 3.1 to 10.6 GHz, are highly suitable for integration of UWB front-ends.
		It is proven that the filter type, either bandstop or bandpass, is mainly dominated by the odd mode of propagation, and the computations for the two parameters k and g are related by the effect of the odd mode fringing capacitances.
		A new ultrawideband microstrip bandpass filter, based on a dual-mode ring resonator with spur-line structures placed at input and output ports, is created.
	www.mwjournal.com /Journal/article.asp?HH_ID=AR_464 (1601 words)

	Bandpass - Club Polk
		It will be much tighter and cleaner than a bandpass box and it will have a much larger frequency range.
		The bandpass will be loud and sound OK if built properly, and you won't have to worry about the very low frequncies destroying your woofers.
		Now the bandpass im getting has four ports on the front of the box and the subwoofer mounting surface doesnt face forward they are angled.
	www.polkaudio.com /forums/showthread.php?t=11981 (516 words)

	Electroluminescent Receiver - Bandpass Filters
		The bandpass filters used in this receiver are based on the article in the September/October 2000 issue of QEX called "Narrow Band-Pass Filters for HF", by William Sabin, W0IYH.
		To change to the 20/17 bandpass filter, the "Ground for 20/17" pad is grounded with an SPST switch.
		Two.01 capacitors are removed and a piece of hookup wire is connected between the output of the TV and FM input filter and the input to the bandpass filters.
	www.pan-tex.net /usr/r/receivers/elrnbpf.htm (1704 words)

	LDSG Appendix A - Enclosures (Site not responding. Last check: 2007-10-31)
		As their name implies, bandpass designs exhibit both low- and high-frequency roll offs of 12 dB/octave in the case of 4th order systems.
		As a result, bandpass enclosures are mostly used to provide the perception of lots of bass from a small box.
		Since bandpass designs have been around for a while, these patents might not survive a vigorous challenge in court from someone with as much money to spend on lawyers as Bose®.
	ldsg.snippets.org /boxes.php3 (3515 words)

	Communications and Energy Providing Products for CATV - MATV - SMATV - CCTV - MICROWAVE - MMDS - MDS - ITFS - LPTV - ...
		Model CEC-1910E comes with integral adjustable notch that may supply 12 to 25 dB of attenuation and may be tuned to either side of the bandpass for additional attenuation.
		It uses two aluminum welded bandpass filters neatly mounted on a bracket with two diplexers.
		is a group bandpass filter which passes a 4-channel group of microwave TV channels and isolates them from all semi-adjacent groups.
	www.cefilter.com /products/display_complete_catalog.asp (1909 words)

	Mimir - Filter Bandpass Data
		Their wavelength basis is an Argon emission lamp spectrum whose 1.17-2.3 microns line positions were determined by eye to the nearest Mimir detector pixel and a dispersion curve fit an calculated.
		The bandpass data are of low quality in the J-band, where the JHK grism used has very low efficiency.
		We expect to improve these bandpass data at the telescope during upcoming engineering and observing runs.
	people.bu.edu /clemens/mimir/filter_bandpass_data.html (77 words)

	Bandpass Filters (Site not responding. Last check: 2007-10-31)
		On this page; a popcorn highpass filter, some inductors and their Q, double tuned bandpass filters and simple Cohn Crystal ladder IF filters are presented.
		This filter topology requires that both ports be terminated in 50 ohms in order to achieve the designed bandpass response and it's associated stop band attenuation.
		Below is a second order Butterworth bandpass filter designed for the 20 meter band.
	www.qrp.pops.net /bandpass.htm (1184 words)

	Nikon MicroscopyU: Fluorescence Microscopy - Green Excitation Filter Combinations - Cy3 (HYQ)
		This filter set is one of two in the Nikon green excitation series that employs a bandpass emission (barrier) filter instead of a longpass type, and by design, effectively limits interference from fluorophores emitting wavelengths outside the target spectral range.
		These high-performance filters are fabricated with a greater number of interference cavities in both the excitation and emission filters, allowing a closer proximity between spectral profiles without suffering excessive crosstalk.
		The Cy3 HYQ filter combination is recommended for use with the cyanine fluorescent probe Cy3, and is designed to reduce or eliminate interference from fluorophores emitting in the red and near-infrared when probes such as tetramethylrhodamine isothiocyanate (TRITC) and DiI are used in multiple labeling techniques.
	www.microscopyu.com /articles/fluorescence/filtercubes/green/cy3/cy3index.html (1107 words)

	Bandpass (Site not responding. Last check: 2007-10-31)
		HF bandpass filters help to overcome overloading from local broadcast stations, or from other amateur radio stations on the same site in a Multi-Single or Multi-Multi environment.
		Top contest stations need to transmit or listen on more than one band at once and attack the problem of overload, spurious transmissions and harmonics by the use of bandpass filters at both receive and transmit environments.
		The unit is housed in a modem type case with DB9 control connector and SO239's for input and output (N-connectors on request).
	www.vinecom.co.uk /bandpass.html (230 words)

	Utah ATV - IF Bandpass filtering on AM TV signals
		While these filters provide excellent bandpass response characteristics, they are limited in their bandstop rejection - that is, the extent to which signals outside the filter's response curve are attenuated.
		For example, if you wanted to build a bandpass filter that went from 3db to 20db attenuation in a 500 KHz span, this would require a "steepness" factor of 15 if the filter were built at 7.5 MHz.
		Because the filter topology is different, and due to the fact that the filter is nearly symmetrical (a result of it's bandpass being reasonably well centered on the video frequency) this filter exhibits no obvious group delay problems.
	www.ussc.com /~uarc/utah_atv/if_filt.html (5112 words)

	Sixth-Order BANDPASS SUBWOOFER ENCLOSURE DESIGN calculator
		This means that this design is capable of creating a sound pressure level of 94 dB when a signal of 1 watt is applied to it, and is measured with the measuring instrument 1 meter (approximately 3.28 feet) away from the speaker system.
		This style of enclosure is patented by the Bose Corporation, information provided is for personal use only.
		One of the reasons bandpass enclosures are so popular is because of an inherent property they have that allows the enclosure designer the flexibility to trade bandwidth for efficiency and vice versa.
	www.carstereo.com /help/Articles.cfm?id=32 (505 words)

	Bandpass Filter is suitable for digital applications., Microwave Filter Co., Inc.
		Bandpass Filter is suitable for digital applications., Microwave Filter Co., Inc.
		The unit is part of a cost effective, premium grade family of filters and networks offered by the company.
		The 14584 comes standard with type F connectors but can be configured to any specific customer requirement, including rack mount (1 RU high), at no additional cost.
	news.thomasnet.com /fullstory/5708/886 (425 words)

	To Bandpass or not to Bandpass - NASIOC
		Bandpass boxes have a well-deserved poor reputation because they are not implemented correctly.
		A bandpass box HAS to be made to the drivers your using.
		You have to remember that a Bandpass box is very effective at its tuned range.
	forums.nasioc.com /forums/showthread.php?t=61645 (652 words)

	Trilithic, Inc. Tunable Bandpass Filters - Bandpass Tunable Filter : Telecommunications Products and Solutions
		Trilithic VF Series tunable bandpass filters cover a frequency range from 3 MHz to 4,000 MHz with any single model covering an octave.
		An engraved dial which is calibrated directly in frequency indicates the center frequency of each filter response with resettability to within ±0.5%, thereby eliminating calibration charts or guesswork.
		With the excellent filtering characteristic of the VF bandpass series, they are ideally suited wherever precision laboratory measurements are required.
	www.trilithic.com /rf_and_microwave_components/filters_tunable/tunable_bandpass.html (309 words)

	Baseband Data Reduction Library: dsp::Bandpass class Reference
		Set the number of frequency channels in the bandpass.
		Get the number of frequency channels in the bandpass.
		Set the integration length and bandpass to zero.
	astronomy.swin.edu.au /pulsar/software/libraries/dsp/classdsp_1_1Bandpass.html (101 words)

	Subwoofer Box Enclosure Design Software
		Providing subwoofer design software programs for solving the required calculations for custom bandpass, sealed and vented box cabinet designs.
		Can be used for car, truck, sport utility vehicle (SUV), jeep automotive, guitar and home theater applications and projects.
		Bandpass Designer, Sealed Designer and Vented Designer provide accurate theoretical solutions for subwoofer driver characteristics and attributes (Thiele Small) and box/enclosure parameters with an easy to use interface.
	www.ajdesigner.com /speaker/index.php (319 words)

	2.4GHz Grid Dish Antennas with Bandpass Technology by Pacific Wireless
		The 2.4GHz Bandpass Filtered parabolic grid directional antennas offered by Pacific Wireless utilize a Patented parabolic grid design with a Patented High Performance Dipole Feed with Patent Pending Bandpass Filter Technology.
		The bandpass filter effectively reduces out of band noise which can overload sensitive microwave receivers and cause degraded performance.
		The bandpass filter also helps minimize transmitted out of band noise due to poorly filtered transmitters.
	www.pacwireless.com /products/bandpass.shtml (407 words)

	bandpass - Club Polk
		I have had a bandpass in both a sedan and hatchback.
		Go ahead and stick the box wherever and who ever told ya that a certian box is for a certain car must have major issues....
		Here are a couple of designs for your MM120's in a bandpass enclosure.
	www.polkaudio.com /forums/showthread.php?p=4243 (216 words)

	Bandpass Subwoofer Box Design Software Instructions
		Bandpass Designer Software calculates 4th order bandpass theoretical enclosures and boxes.
		Vf, Vr, Fl, Fh, Fb, and Lp will still be valid for Qts, Qes, Vas, Dp and number of Ports.
		Bandpass Designer should give a good approximation of box parameters for most applications.
	www.ajdesigner.com /speaker/ajbandpass.php (294 words)

	eBay Canada - Bandpass, Dual Boxes, Enclosures — new and used items at discount prices on eBay.ca (Site not responding. Last check: 2007-10-31)
		Dual 12" Bandpass Loaded Subs w/Blue Neon Lighting NEW
		QLOGIC by ROCKFORD FOSGATE dual 10 BANDPASS ENCLOSURE
		Q-LOGIC By Rockford Fosgate Dual 10 Bandpass Enclosure
	electronics.listings.ebay.ca /Dual-Boxes_Bandpass_W0QQfsooZ1QQfsopZ19QQsacatZ50567QQsocmdZListingItemList (576 words)

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