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Topic: Comb filter

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	Flanging - Wikipedia, the free encyclopedia
		This produces a swept 'comb filter' effect: peaks and notches are produced in the resultant frequency spectrum, related to each other in a linear harmonic series.
		Extending the comb analogy, flanging uses a comb filter with regularly-spaced teeth (like a brand new hair comb), whereas phasing uses a comb filter with irregularly-spaced teeth (like a worn hair comb with teeth that have been bent or broken).
		Thus, whilst the peaks and troughs of the comb filter are more-or-less in a linear harmonic series, there is a significant amount of non-linear behaviour too, causing the timbre of tape-flanging to sound more like a combination of what came to be known as flanging and phasing.
	en.wikipedia.org /wiki/Flanging (1092 words)

	TV and Video Comb Filters
		The output of a comb filter is S-Video.
		For a "standard comb filter" it is OK for the dot of the lowercase I to be duller and elongated slightly upwards on the comb filter set while it fits sharp and clear on one or two lines (but maybe wider sideways) on a 260 line resolution set.
		Comb filters are sometimes sold separately, as "composite to S-video converters".
	members.aol.com /ajaynejr/vidcomb.htm (8893 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-21)
		The comb filter 300 also comprises a lens 303, a wedge- shaped plate 304 composed of a birefringent material such as calcite or rutile, and a non- linear interferometer 305.
		of the dense optical channel comb filter 300 of the present invention has a different shape as a result of the properties of the non-linear interferometer 305 of which it the comb filter is comprised.
		The dense optical comb filter 900 is configured such that, for all temperatures and wavelengths, the average deflection angle is zero, that is Od = 0.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/88579.011122&ELEMENT_SET=DECL (5710 words)

	Voice switching arrangement for telephone conferencing - Patent 4456792
		This arrangement is achieved in a multiparty connection by using two complementary comb filter banks on a voice channel with the filter passbands of the first bank being stopbands in the second bank and vice versa.
		In this patent, two banks of comb filters are utilized on a voice channel with the filter passbands of the first bank being stopbands in the second bank and vice versa.
		When an interrupting speaker begins to talk, a first comb filter bank is assigned to the speech path of the first speaker and a second comb filter bank is assigned to the speech path of the interrupting speaker or the loudest of interrupting speakers.
	www.freepatentsonline.com /4456792.html (1850 words)

	Response Effects of Guitar Pickup Position and Width
		Comb filter responses are often associated with time delays (echoes, flange effects, chorus effects).
		The comb filter is implemented by subtracting a delayed version of the signal from the incoming signal for that string.
		The pickup position response is a comb filter curve and the pickup width response is a 6dB per octave low pass comb filter response.
	www.till.com /articles/PickupResponse (3596 words)

	Delay Lines (Site not responding. Last check: 2007-10-21)
		Comb filters get their name from the shape of their magnitude response and are important components of audio signal processing networks.
		A feedforward comb filter is illustrated in Fig.
		The feedforward comb filter is equivalent to the echo simulator of Fig.
	www.music.mcgill.ca /~gary/614/week1/delayline.html (1353 words)

	Sweetwater inSync
		A comb filter is a filter that has a series of very deep notches in its frequency response with the spacing of all of the notches at multiples of the frequency of the lowest notch (they are all harmonically related).
		A static comb filter will make its audio sound kind of hollow or "phasey" depending upon how severe it is. Add some modulation and you have a flanger.
		Comb filtering is one of the main ingredients in the distinctive sound of a jet aircraft passing overhead.
	www.sweetwater.com /insync/word.php?find=CombFilter (281 words)

	Extron Electronics
		Today, digital processing is the norm for comb filters and the technical intrigue continues as we inch closer to the full digital television age.
		Lowest in the food chain is the single line comb filter; next, the 2-line comb filter; and yes, the 3-line version; replaced by 2D adaptive methods; and, currently the sophisticated 3D motion-adaptive comb filter.
		Perhaps the largest disadvantage to the 2-line comb filter is that vertical resolution suffers due to the constant weighted averaging of picture information.
	www.extron.com /technology/archive.asp?id=ntscdb3 (1335 words)

	Comb filter system (US4184174)
		In apparatus for playback of a video disc record bearing chrominance information recorded in "buried subcarrier" format, a comb filter involving subtractive combination of the input and output of a 1H delay line is used to separate chrominance component of recorded composite signal from accompanying luminance signal.
		first comb filter means having an input and an output, and having a frequency response characteristic exhibiting a plurality of regularly spaced response peaks, with the separation between adjacent ones of said regularly spaced response peaks of said first comb filter means corresponding to a first frequency;
		means for deriving a filtered version of signals applied to the input of said first comb filter means from the output of said second comb filter means.
	www.delphion.com /details?pn=US04184174__ (316 words)

	Digital Video Essentials - Using Video Test Patterns in DVE # 12
		In the mean time we used a notch filter decoder, where all of the luminance detail in the frequency space of the color information was lost to the color channel.
		The Sharpness control was added to the notch filter decoder in these early days of color television to pull detail out of the edge of the luminance information, at the lower edge of the notch filter.
		Once we were able to move to comb filters, where much of the luminance detail sharing frequency space with the chroma signals could be recovered, there was no longer a need for the sharpness control.
	www.videoessentials.com /D_Theater_signals12.php (1217 words)

	Jasmin Frenette Master's Thesis - Chapter 2
		The poles of the all-pass filter are thus at the same location as the comb filter, but we now added some zeros at the conjugate reciprocal locations.
		The attenuation gains of the comb filters were chosen according to (2.16) and the all-pass gains were both set to 0.7.
		By combining a bank of all-pass filters with a bank of comb filters such that each comb filter processes a different frequency range, the reverberation time of each specific frequency band can be set by adjusting the corresponding comb filter’s feedback gain.
	www.music.miami.edu /programs/Mue/Research/jfrenette/chapter_2/chapter_2.html (3655 words)

	Flat TV People : Comb Filters
		Comb filters are designed to clean up any fuzziness or artifacts brought in by the composite signal.
		Comb filters use various methods to clean up artifacts and therefore vary in effectiveness.
		NOTE -- A TV’s comb filter is bypassed when S-Video or component video is used as the input signal, because S-Video and component video signals are comprised of separate Y and C elements already.
	www.flattvpeople.com /tutorials/comb-filters.asp (285 words)

	Response Effects of Guitar Pickup Mixing
		Perhaps the single comb filter response is the sonically important characteristic of the single pickup timbre while the chaotic appearance of the dual comb filter response is the sonically important characteristic of the two pickup timbre.
		And perhaps the dual comb filter resonance is similar enough to the natural resonances of an acoustic instrument to suggest that quality.
		This is a cosine comb filter, a little different from the sine comb filter that is characteristic of a single pickup response.
	www.till.com /articles/PickupMixing (2388 words)

	A note on iterative learning control, repetitive control and comb filter
		combed apart, the luminance signal information, however, being subjected to at least one additional stage of comb filtering, preferably limited to that part of the playback spectrum containing the interleaved signal information.
		The comb filter is used as a feedback loop which will store and feedback the signal continuously.
		Q-filter is a low pass filter (LPF) which fades the comb teeth at higher frequencies.
	www.csois.usu.edu /ilc/ILC/comb_filter (584 words)

	Comb Filter
		After the low-pass filter, the most common synthesiser filter is the 'high-pass' filter, so called because it passes frequencies above the cut-off frequency, and attenuates those lying below it.
		Comb filters, which are a special case of multiple notch filters, are the rarest of all analogue synthesiser filters.
		The RS120 is a comb filter based upon a BBD (bucket brigade device) analogue delay line.
	www.analoguesystems.co.uk /modules/rs120.htm (884 words)

	Extron Electronics
		Since conventional (line type) comb filters have problems handling diagonal lines and vertical color changes, it seems the first order of business would be to tackle these tricky situations.
		The term adaptive carries wide meaning in that comb filter manufacturers create unique methods that enable the filter to make better decisions as to the process algorithms to use.
		In 3D comb filtering, picture information is taken and compared to information in successive frames (called inter-frame filtering) as opposed to 2D filters which process data taken from successive lines within a field or frame (intra-frame filtering).
	www.extron.com /technology/archive.asp?id=ntscdb4&version=print (1429 words)

	The Comb-Allpass Filter (Site not responding. Last check: 2007-10-21)
		filter (or IIR comb), is the peak-to-valley ratio
		The poles of the comb filter are evenly distributed along the unit circle at
		input of the delay line to the filter output, as it is depicted in fig.
	www.faqs.org /docs/sp/sp-69.html (240 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		The comb filter then takes its input, outputs it, and then puts it into a buffer so that any new input is added in delay time later, using a delay.
		There is no averaging or other filtering of the string in this model, other than the resonance that it gets from "being a certain length" (just like in physical systems).
		You can filter the feedback signal to simulate the frequency-dependent decay in real instruments, but the filtering introduces more delay time, which reduces and thus detunes the frequency.
	www.artic.edu /~sdecker/education/programmingsound/karplus-Strong (531 words)

	AnandTech - Digital Comb Filters on HDTVs (Site not responding. Last check: 2007-10-21)
		The comb filter is used for one purpose only - it's used to process a composite (analogue) signal for display or recording.
		The cable signal is digital (so comb filtering is not required) and a new analogue signal is generated by the decoders in the STB.
		S-video and component don't require filtering - the comb filter is only used to seperate the luminance and chrominance where they have been combined onto a single wire.
	forums.anandtech.com /messageview.cfm?catid=31&threadid=1680342 (1573 words)

	AudioVideo101.com - Audio/Video Dictionary (Site not responding. Last check: 2007-10-21)
		Comb filters are not required and not used with S-Video (Y/C video) or component video connections since those connections carry the chrominance and luminance separately.
		A comb filter (or some other filter such as a notch filter) is necessary for any composite video format including laserdisc and television programming.
		Comb filters are superior to notch filters in separating out the color and brightness information, however, they do add some distortions to the final image not present when a component or Y/C video format is used.
	www.audiovideo101.com /dictionary/comb-filter.asp (226 words)

	DotCrawl Comb filter (Site not responding. Last check: 2007-10-21)
		Spatial filtering works on pixels within a single frame, and is applied to parts of the picture that have changed since the previous frame (ie: where there’s motion). While it does not increase actual picture detail, it can reveal details that would otherwise be masked by the dot patterns.
		The temporal comb filter settings control how the temporal kernel distinguishes between moving and non-moving images. That’s not as trivial as it sounds because luma-chroma crosstalk (which is the defect the filter is designed to remove) causes pixel values to change between frames even when the underlying image has not changed. The choices are:
		I started with just a temporal comb filter. An NTSC composite signal is the sum of the luma and chroma signals. The luma is a fl-and-white representation of the picture, while the chroma signal is a quadrature-amplitude-modulation of a vector, which itself is the sum of two orthogonal vectors (the I and Q subchannels). Hence:
	home.earthlink.net /~tacosalad/video/dotcrawl.html (1226 words)

	[No title]
		Like the "basic" section where we construct a filter chain to clean up the analog video signal, we are just going to introduce a few of the more popular filters and explain how they most effectively work together.
		Guava Comb is a "comb filter" (like the one in most "digital" TVs) used to help poor Luma/Chroma separation in broadcast sources.
		Chroma Noise Reducer 2 (CNR2) is a filter that was inspired by the Chroma Noise Reduction (CNR) filter that we used in the "basic" section.
	arstechnica.com /guides/tweaks/cleaning.ars/8 (1308 words)

	Unknown (ResearchIndex)
		Abstract: The study is concerned with a single-parameter adaptive comb filter (ACF), a multi-notch filter with periodically located nulls.
		The filter is suggested to retrieve a waveform modeled by superposition of harmonics, in particular, periodic non-sinusoidal signal.
		4 Adaptive notch filtering for the retrieval of sinusoids in n..
	citeseer.ist.psu.edu /658422.html (263 words)

	Discussing: Hisense 24" Flat-Tube Stereo TV $170 at
		Comb filters more or less precisely separate fine fl and white detail from color information in the NTSC television system.
		The set may indeed be comb filtering on the sly; usually, though, a TV maker wants to advertize such a feature.
		As useful as a comb filter is, on a 24" tv it won't make much difference either way.
	www.bensbargains.net /ktalk/1074910887,76891,.shtml (587 words)

	digital filter - Measurement Encyclopedia - National Instruments (Site not responding. Last check: 2007-10-21)
		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.
		The amplitude spectrum of this comb filter is shown in Figure 47.
		The comb delay must be transferred from a transmission-line type device to a digital component such as a D-flipflop or a delay represented by a line of software code.
	zone.ni.com /devzone/nidzgloss.nsf/webmain/829980731A4CD570862568C50006AB83 (2708 words)

	Brush (Site not responding. Last check: 2007-10-21)
		Brush - MIDI controlled comb filter VST effect for the PC, that uses two sets of dual-comb filters to create phaser effects, reverb, distortions and many other unique effects.
		2 dual-comb filters, with built in filtering and distortion and crossfeedback, which can be arranged in parallel or serial and has built in feedback limiting.
		BrushSyn is a comb filter VSTI monosynth for the PC, this uses the same architecture as Brushsyn, to create a variety of different sounds, such as plucked strings, basses, pad, drums and a vast range of sound effects
	www.concretefx.com /Brush.htm (150 words)

	Comb filter for video processing (US3996606)
		A charge transfer delay line, part of a comb filter, is caused to vary in delay time in consonance with the frequency errors in the color video signal.
		first comb filter means, including means for subtractively combining signals provided by said delay means and said receiving means, for filtering said composite color video signals in accordance with a first comb filter characteristic having multiple rejection notches falling at a first plurality of spaced frequencies;
		second comb filter means, including means for additively combining signals provided by said delay means and said receiving means, for filtering said composite color video signals in accordance with a second comb filter characteristic having multiple rejection notches falling at a second plurality of frequencies interleaved with said first plurality of spaced frequencies; and
	www.delphion.com /details?pn=US03996606__ (440 words)

	Jasmin Frenette Master's Thesis - Chapter 3
		For a parallel comb filter with equal magnitude, all comb units are decaying at the same rate.
		As we saw in the previous section, a considerable number of comb filters are required to achieve a good time density in a parallel comb filter design, given a reasonable frequency density.
		Thus, a series all-pass filter that has the same delay lengths and feedback gains as a parallel comb filter also has the same eigenmodes (resonant frequencies and decay rates) as the parallel comb filter.
	www.music.miami.edu /programs/Mue/Research/jfrenette/chapter_3/chapter_3.html (2799 words)

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