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Topic: Passband

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passband ripple

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	Lorch Specification Guide
		In many cases it is important to know more about the passband of a filter around the transition region between the passband and the stopband.
		The passband of the filter becomes rounded at the bandedges.
		This is the inverse of the lowpass circuit shown.
	www.lorch.com /specifications.html (743 words)

	Nikon MicroscopyU: Fluorescence Microscopy - Excitation Balancers - Interactive Java Tutorial
		Adjacent to this window is a spectral plot entitled Excitation Passband Spectral Profiles, which displays the absorption spectra for the fluorophores utilized to stain the specimen along with the approximate transmission percentage (white line) of the excitation balancer filter combination at the illumination aperture (see the excitation balancer drawing) in the visible spectral region.
		The fluorescent probes and their targets are identified for each specimen in the lower left-hand portion of the tutorial window next to a colored bar that coincides with the color of the excitation spectral profile in the excitation passband graph.
		As the slider is translated to the far left, the aperture moves into the shortpass region of the balancer and the excitation passband changes to resemble the profile of a shortpass filter.
	www.microscopyu.com /tutorials/java/fluorescence/excitationbalancer (1689 words)

	SIMPLIFIED HIGH FREQUENCY TUNER AND TUNING METHOD
		The near-baseband passband is also sufficiently high to allow a fairly relaxed transition from a cutoff at or near DC to the lower edge of the passband.
		Because of the positioning and size of the near-baseband passband and associated digital tuning, whether continuous fine-tuning or stepwise tuning, alternate selection of the upper and lower high frequency spectra of interest can be used to provide non-redundant coverage of the broadband frequency spectrum from which the desired signal is to be received.
		Due to the preferred spacing from DC of the near-baseband passband of the present invention as illustrated for example in Figure 2, the near-baseband passband is sufficiently separated from DC for an efficient and accurate Hilbert transform to be performed.
	eepatents.com /receiver/Spec.html (8616 words)

	SIMPLIFIED HIGH FREQUENCY TUNER AND TUNING METHOD
		Figures 3 and 4 are diagrams illustrating the use of the near-baseband passband of the present invention with channelized frequency spectra.
		The near-baseband passband is also sufficiently high to allow a fairly relaxed transition from a cutoff at or near DC to the lower edge of the passband.
		Due to the preferred spacing from DC of the near-baseband passband of the present invention as illustrated for example in Figure 2, the near-baseband passband is sufficiently separated from DC for an efficient and accurate Hilbert transform to be performed.
	www.eepatents.com /receiver/Spec.html (8616 words)

	Variable-passband variable-phase digital filter - Patent 4709343
		Concurrently with the passband variation, digital filters corresponding to the mode of utilization just mentioned sometimes have structures which also permit interpolation of m intermediate values between two successive samples of the signal, with the result that m.times.n sets of weighting coefficients are usually applied to these filters.
		In the structures described earlier, the variation in passband of the filters is usually obtained by varying the value of the coefficients K.sub.1, K.sub.2, K.sub.3 and K.sub.4 applied to the inputs of the filter.
		By choosing read-only memories (ROMs) having a capacity of 4 kilo-octets for the construction of the memories 58 to 61 and read-only memories (ROMs) having a capacity of 1 kilo-octet for the construction of the memories 62 to 64, the structure shown in FIG.
	www.freepatentsonline.com /4709343.html (4049 words)

	Analog Filter Design (DSP Blockset)
		The magnitude response of a Chebyshev type I filter is equiripple in the passband and monotonic in the stopband.
		Chebyshev type II The magnitude response of a Chebyshev type II filter is monotonic in the passband and equiripple in the stopband.
		The magnitude response of an elliptic filter is equiripple in both the passband and the stopband.
	www.cs.berkeley.edu /titan/sww/software/matlab/toolbox/dspblks/analogfilterdesign.html (470 words)

	[No title]
		The RF passband is a slowly varying function of frequency, and includes the relative phase between the antennas.
		Since the passband residuals depend on the correlator configuration, the astronomical passband should be made using the same correlator configuration as the source observations.
		If sinosoidal real, or imaginary passband residuals are evident in a spectral window, then polynomial fits to the amplitude and phase may give smaller residuals, but a steep phase slope within a spectral window may be an intermittent correlator problem, and not be present in the source data to be corrected.
	bima.astro.umd.edu /memo/memo33.txt (1074 words)

	Constricted Passband Equiripple by Buhertz Technologies
		For example, if the quality of a low pass passband is not an issue for the lower 50%, the equiripple may be constricted to the upper 50%.
		It is easily seen that for both filters, the constriction of the equiripple in the passband produces increased attenuation in the stop band, and possible may lead to a smaller required order of filter.
		Note that the Elliptic passband ripple is already pushed closer to the band edge and therefore requires a smaller percentage of constriction.
	www.filter-solutions.com /constrict.html (254 words)

	Sealed Rear Chamber Bandpass Sub Woofer Design Tips
		Another drawback to the lower S Factor designs is that they have more passband ripple (the sag in the frequency response plot in Figure 1).
		This will be the first number in the "Passband" box when you calculate an enclosure.
		Passband - refers to the range of frequencies that will be allowed to pass through the speaker system (the frequencies you will be able to hear/feel).
	www.carstereo.com /help2/articles.cfm?id=25 (920 words)

	SSB Filter Group Delay
		This is a plot of the previous filter's passband insertion loss in dB and group delay, also tested by Harold, and plotted by a VNA group delay test program.
		This plot, at 2 dB per vertical division and 0.5 kHz per horizontal divison, shows that the passband ripple is under 1 dB and the 6 dB bandwidth is 2.9 kHz.
		The sharp increases in group delay at the ends of the passband, about 2.7 milliseconds in this case, are characteristic of filters that have been optimized for skirt selectivity.
	n2pk.com /TestResult5.html (155 words)

	Trilithic, Inc. RF Filter Glossary
		The width of the passband or the stopband of a filter, normally referenced to the minimum insertion loss point in the passband.
		For example, the passband of a filter is normally stated as a -3 dB bandwidth and the stopband may be stated as a -40 dB bandwidth.
		The variations in amplitude (transmission loss) in the passband of the filter, superimposed upon the fundamental shape of the passband.
	www.trilithic.com /rf_and_microwave_components/rf_filter_glossary.html (1141 words)

	quartztek filters, crystal filters, and crystal application notes.
		Passband (BW): The range of frequencies attenuated less than a specified value, typically 3 or 6 dB.
		Fractional Bandwidth: The ratio of the passband bandwidth to the center frequency.
		Both the peak and the valley are defined by a surrounding change in slope, i.e.
	www.mindspring.com /~richard24/quartztek/qtek_library/filter_app_notes/filter_terms/filter_terms.htm (564 words)

	Hamlib - the C library reference: filter_list Struct Reference
		The first entry in the array below the default normal passband is the default narrow passband and the first entry in the array above the default normal passband is the default wide passband.
		The width field is the narrowest passband in a transmit/receive chain with regard to different IF.
		Passband width in Hz The documentation for this struct was generated from the following file:
	hamlib.sourceforge.net /manuals/1.2.5/html/structfilter__list.html (194 words)

	K&L Microwave, Inc. - Filtering Solutions For Your Global Market (Site not responding. Last check: )
		The width of the passband of a bandpass filter is the frequency difference between lower and upper corner frequencies, such as 3 dB points.
		The upper passband edge in lowpass filters or the lower passband edge in highpass filters.
		Envelope delay is proportional to the slope of the phase shift response versus frequency curve.
	www.klmicrowave.com /ecommerce/filterdef.shtml (1054 words)

	Working Group on Infrared Astronomy: On Improving IR photometric passbands
		Figure 10b: Optimization data for the determination of FWHM of the proposed "z" passband.
		Figure 11: Optimization data for the placement and FWHM determination of the proposed "J" passband.
		Figure 21b: Optimization data for the FWHM determination of the proposed "N" passband for several peak wavelength placements.
	www.ucalgary.ca /~milone/IRWG/yms/figs8-25.html (953 words)

	ellipord (Signal Processing Toolbox)
		This value is the number of decibels the stopband is attenuated with respect to the passband response.
		For 1000 Hz data, design a lowpass filter with less than 3 dB of ripple in the passband defined from 0 to 40 Hz and at least 60 dB of ripple in the stopband defined from 150 Hz to the Nyquist frequency (500 Hz).
		Now design a bandpass filter with a passband from 60 Hz to 200 Hz, with less than 3 dB of ripple in the passband, and 40 dB attenuation in the stopbands that are 50 Hz wide on both sides of the passband.
	www.cs.berkeley.edu /titan/sww/software/matlab/toolbox/signal/ellipord.html (459 words)

	Digital Signal Processing Filter Terminology
		The ripple in the passband and stopband are equal with elliptic filters.
		Specifically, the end of the passband and the beginning of the stopband are equally spaced on either side of fs/4.
		Passband ripple, measured in dB, is illustrated in Figure F-6.
	www.dspguru.com /info/terms/filtterm/index2.htm (2987 words)

	Notes of the Design of Optimal FIR Filters
		The peak deviation in the passband is denoted
		portion to correspond to the transition from the stopband to the passband.
		is the peak amplitude deviation in the passband.
	www.appsig.com /products/tn070.htm (6125 words)

	[No title]
		The UCD and passband name are set blank, * and the central frequency is set to the mean of minSpec and maxSpec.
		The minimum spectral value for the PassBand is set * to "start - 0.5inc", and the maximum spectral value is set to "start + (n - 0.5)*inc", where "n" is the length of the "lut" array.
		The UCD and * passband name are set blank, and the central frequency is set to the mean of * minSpec and maxSpec.
	www.starlink.ac.uk /~dsb/VOpassband/PassBand.java (3046 words)

	Easy Fourier Analysis
		The passband signal bandwidth is double that of the baseband signal.
		We notice that since the passband spectrum is symmetrical (not only about the y-axis but also about the carrier frequency) the upper sideband is the mirror image of the lower sideband.
		DSB signals which are passband signals have a bandwidth of 2B.
	www.complextoreal.com /base.htm (3857 words)

	Comparison of DayStar and Coronado H-a Solar Filters with Spectrohelioscopes - Review
		In general, for any of these instruments, the H-alpha passband must be better than 0.8A for acceptable performance, assuming the telescope to which it is attached is performing optimally.
		And it is not necessary to have 0.2A or 0.1A passband — even if you had such a very narrow passband, the solar detail would not gain in contrast, because atmospheric ‘seeing’ would introduce fuzziness into the image.
		Also note that a 0.7A passband filter passes more light than a 0.5A or a 0.2A passband, so the solar disk will be slightly darker visually (but, then, there is a lot of light to begun with, and the eye will automatically compensate.
	www.cloudynights.com /item.php?item_id=370 (2493 words)

	Example Scripts
		The first example illustrates how to observe a passband source followed by a single source and a calibrator.
		Finally, the calibration step is extended to using a wide, narrow, and wide passband observation on the calibrator source.
		Hence, if the passband combination has not been observed already, then the loop command should terminate early enough (before the project stop time) so that enough time will remain to observe the passband at the end of the project.
	bima.astro.umd.edu /user/setups/examples.html (928 words)

	Low-Pass Filtering Tutorial and Glossary of Terms
		If passband frequencies near the cutoff are included, the ripple can be significantly greater.
		However, in practice, a filter designed for phase linearity can have passband phase linearity as low as a fraction of a degree, while other filters can have non-linearities so great that the group delay changes by a factor as high as 2 or 3 over the passband.
		Unlike for resistor noise, changing the filter passband does not greatly change the total wideband RMS value for switched-capacitor filter noise.
	www.alligatortech.com /DAA/glossary.htm (734 words)

	Amazon.com: "maximum passband attenuation": Key Phrase page
		See all pages with references to "maximum passband attenuation".
		The maximum passband attenuation is specified as A, = 1 dB.
		The parameter Ben determines the maximum passband attenuation according to 1 _ 1 IT n (j 1)I2 = 1 +8 2 - 1 + B2nlA(1) that is, Ben...
	amazon.com /phrase/maximum-passband-attenuation (312 words)

	Printer Friendly Version
		The differences between these approaches are even more dramatic when the passband ripple and stopband ripple specifications are different, since truncated-and-windowed impulse response methods always give a result with approximately the same passband and stopband peak ripple.
		A drawback in the IFIR design is that the passband ripples of the two filters are combined in a disorderly fashion.
		By precompensating for a severe "droop" in the image suppressor filter, a flat passband can be achieved with dramatic savings in the number of multipliers required for the image suppressor filter.
	www.microwavesrf.com /Articles/Print.cfm?ArticleID=7469 (2107 words)

	eHamRadio - Radio Frequency Interference (RFI)
		This is defined as undesired signals with frequency components which fall within or near the receiver’s RF passband and are translated outside of the IF passband via the mixer stage.
		The undesired emissions which are translated outside of the IF passband may still pass through the remaining receiver stages, if at high enough levels to survive the out-of-passband attenuation.
		This is defined as undesired signals with frequency components that are significantly removed from the receiver’s RF passband.
	www.radioing.com /hamradio/rfi.html (935 words)

	IRAF Help page for "calcband" (V2.10.4p2)
		The reson for supplying a separate front end to handle passbands is that some of the task parameters to calcspec, such as 'form' are not relevant to calcband.
		The interpreter supports several functions which return passbands: band(), which returns a passband corresponding to an hst observing mode, box(), which returns a box passband, gauss() and lgauss(), which return gaussian and log gaussian passbands, and poly() and tilt(), which return Legendre polynomial passbands.
		The combination of the arguments should uniquely specify an observing mode.to this box(num1, num2) num1: passband center num2: passband width A passband that is one inside the specified region and zero outside.
	ecf.hq.eso.org /scripts/irafhelp?calcband (554 words)

	Design Tools
		Chebychev transfer functions are typically used in applications requiring higher performance in the frequency domain (i.e., a sharp cutoff between passband and rejected frequency bands).
		Relative Bandwidth - The passband´s relative size as defined by the 3 dBc bandwidth divided by the center frequency.
		Passband Shape Factor - The relative rolloff or shape of the filter's passband, as defined by the loss characteristics between the 1 dBc and 3 dBc bandwidths, is provided below for comparison of available topologies.
	www.qmicrowave.com /design_tools.htm (628 words)

	STEP 3
		If you were not satisfied with the way your filters were sounding and/or you observe a significant change in pitch on a received signal when changing from one filter to another, it may be time to re-do the entire filter alignment process.
		Shoot for the top of the passband to be displayed at the -30 to -40 dBm level in the Spectrogram display.
		When the center of the passband is aligned with the vertical marker, that is the BFO position you want.
	www.qsl.net /w3fpr/step_3.html (1834 words)

	Synthetic Photometry
		Several tasks simulate HST instrument passbands and spectra, calculate photometric observations from simulated or observed spectra, display and compare synthetic and observed data, and fit simulated data to observations.
		The passband generator follows a path through the instrument graph table--i.e., the table that defines which optical components can be connected together.
		In addition to computing the total counts integrated over the chosen instrument passband, it is possible to compute the number of counts at a particular reference wavelength through the use of the refwave parameter.
	stsdas.stsci.edu /documents/SUG/UG_41.html (1557 words)

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