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	Matched filter - Wikipedia, the free encyclopedia
		A matched filter is obtained by correlating a known signal, or template, with an unknown signal to detect the presence of the template in the unkown signal.
		The matched filter is the optimal linear filter for maximizing the signal to noise ratio (SNR) in the presence of Gaussian white noise.
		Matched filters are commonly used in radar, in which a signal is sent out, and we measure the reflected signals, looking for something similar to what was sent out.
	en.wikipedia.org /wiki/Matched_filter (323 words)

	[No title]
		Matched Filter output from an FSK demodulator -- cocoaModem uses a true matched filter on the mark and space signals and this waveform shows the signal formed from the difference of the two matched filter outputs.
		Matched filter output from a wave-shaped AFSK signal -- this is the same signal as the above but the FSK signal is generated by bandpassing an AFSK signal using the 7-th harmonic filter mentioned earlier.
		Matched filter output from a more severe wave-shaped AFSK signal -- the same phase continuous signal is passed through the bandpass filter with cutoffs at the 3rd harmonic of the keying signal.
	homepage.mac.com /chen/FSK/sidebands.html (589 words)

	The Detection Algorithm
		The filter was chosen to match the rising arm of the startle response, as shown in Figure 2.
		The digital filter, f[n], of length l (for the filter shown l=800), used for detection is a time-reversed rising edge of a typical startle response.
		The matched filter can be tailored to best represent the response of individual users, however the shape of the response is similar for many people and in this paper the typical response filter in Figure 2 was used for all subjects.
	vismod.media.mit.edu /tech-reports/TR-468/node5.html (427 words)

	The Matched Filter
		The purpose of the Matched Filter is to maximize the signal to noise ratio and to minimize the probability of undetected errors received from a signal.
		The proper use of the matched filter is to set the rise time to be equal to the pulse width of the pulses in a bit stream.
		Filter Solutions uses an approximate solution that optimizes the time response of the filter with the constraint that the transfer function zeros remain on the JW axis.
	www.filter-solutions.com /matched.html (302 words)

	Matched Filtering and Timing Recovery in Digital Receivers - match filter, timing recovery
		By filtering the received signal with such a filter at the receiver, the frequencies containing the data signal are passed while the remaining frequencies are attenuated.
		This matched filtering limits the amount of the noise spectrum that is passed on to subsequent stages in the receiver.
		The concept of the matched filter receiver is introduced as a way to limit the noise at the receiver, as well as to provide a high SNR sampling point due to the correlation gain.
	rfdesign.com /mag/radio_matched_filtering_timing/index.html (3731 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Electromagnetic Filtering: It is known that the nature of the materials from which electromagnetic filters are made causes the response of the material to light or other electromagnetic signals to depend upon the frequency of the signal impacting the material.
		The filters may be thin film filters, in-fiber gratings, fiber optic Bragg gratings, spatial light modulation filters, or any other filter which will alter the amplitude and phase of individual frequencies of the modulated pulses in order to produce the desired signal form.
		It is the same filter as block 52 and may be constructed of the same materials as the filter in block 52.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/50663.010712&ELEMENT_SET=DECL (5681 words)

	THEORY
		This project is an implementation of a matched filter stage for a pulse compressed and coded radar signal detector using Xilinx FPGAs.
		The instant when they match or the auto correlation is the maximum is the point at which the signal is considered to have arrived.
		A matched filter is part of the receiver that is specifically designed to maximize the output signal to noise ratio.
	www.members.tripod.com /~kp_kiran/dpcm.htm (2900 words)

	ELEC 320: Laboratory Assignment 4 (Site not responding. Last check: 2007-10-14)
		Matched filters are defined by their impulse response, so the filter output is computed by a convolution operation.
		The result y(t) is the signal that appears at the output of the matched filter.
		Be sure to have a plan for how to implement the matched filter with discrete-time samples before we discuss the matched filter implementation in the simulation.
	www.eg.bucknell.edu /~kozick/elec32098/lab4.html (1312 words)

	[No title]
		The matched filter has, since its conception in 1947, proven itself a remarkably potent and attractive type of filter for aiding in the detection of pulses.
		This three-day intensive course fills that gap, supplying a digest of the requisite background digital filter and random noise theory prior to experimentally investigating the signal-to-noise criterion used for pulse detection and then deriving the optimal matched filter transfer function.
		Major emphasis is given to the FIR matched filter due to its inherent appeal for unattended safety-critical usage.
	www.coned.uah.edu /sessioninfoprint1kplus.cfm?courseid=dmf (386 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		The filter coefficients for the SYNC/SP matched filter are not adjusted during either the SYNC or serial probe section of the waveform in order to provide a common reference point for selection of the Rake Taps.
		For the receiver matched to the transmit pulse-shape, the convolution operation in the receiver results in the autocorrelation function or squared autocorrelation function of the modulation signal depending on the receiver architecture.
		A method as claimed in claim 17, wherein said multiplexer inputs are connected to a filter coefficient array, said filter coefficient array comprising a plurality of vector signals adapted to control said programmable matched filters to select a coefficient of delay.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/84080.031009&ELEMENT_SET=DECL (5907 words)

	Advanced Hyperspectral Analysis
		Matched filter results are presented as gray-scale images with values from 0 to 1.0, which provide a means of estimating relative degree of match to the reference spectrum (where 1.0 is a perfect match).
		MTMF Constrains the Matched Filtering as mixtures of the composite unknown background and the known target.
		The best match to a target is obtained when the Matched Filter Score is high (near 1) and the infeasibility score is low (near 0).
	www.union.edu /PUBLIC/GEODEPT/COURSES/remote_sensing/labs/tutorial/tut11.htm (6014 words)

	Synergies in Handset Architecture - With increasing interest for synergistically integrating GPS into wireless ...
		The matched filter design is optimal from an SNR standpoint because the receiver impulse response replicates, or reproduces, the expected transmitted signal.
		An important distinction between the matched filter and the active correlator designs is that, because the correlator yields a single output value per symbol or bit, it must have side information, such as start and stop times over which the product integration should take place.
		A practical realization of such a sounding device is a matched filter that is matched to the different multipath delays of the received PN code.
	www.gpsworld.com /gpsworld/article/articleDetail.jsp?id=12208&&pageID=3 (1600 words)

	[No title]
		The exact implementation of the matched filter receiver was not specified and was left as a design choice for the vendor that would design and build the DAMS receivers for the DCP 300 bps and 1200 bps transmissions.
		The concept of the matched filter receiver as stated in Section 4 of this report is normally stated with the words transmitter and receiver reversed.
		The reference to the attached receiver matched filter curves are interpreted as a reference to the curves for amplitude versus frequency and time delay versus frequency attached to this report and described briefly in Section 2.
	water.usgs.gov /datarelay/hdr/hdr_ncar.html (4912 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Upon initial glance, one would be inclined to assume that implementing a simple matched filter would be a fairly straightforward, and relatively precise means of accomplishing this projects goal.
		There are several key issues involved with the implementation of a matched filter that deem it an unsatisfactory algorithm in this particular instance.
		For a matched filter to function correctly, we must be able to match pitches precisely.
	cnx.rice.edu /content/m13186/1.3/source (344 words)

	Matched filter (Site not responding. Last check: 2007-10-14)
		For an explanation of a matched filter it is convenient to represent the originally transmitted signal and the received signal as vectors.
		Hence, the values of the matched filter coefficients depend on the pulse shape and the characteristic of the noise.
		Number of filter stages: The depth of the FIR filter is defined to be five.
	www.kip.uni-heidelberg.de /atlas/DATA/publications/DISS/node59.html (389 words)

	2-Stage Matched Filter
		The high processing rates associated with matched filter based receiver structures enable such systems to concurrently examine all signals arriving within a prescribed multipath delay profile, identify all present signals and select any number of them for further processing with minimal delay.
		In summary, the ability of matched filter-based systems to concurrently, rapidly and accurately process DSSS signals within a prescribed multipath delay profile is the fundamental reason that makes matched filters so desirable.
		Realistic matched filter based architectures became possible due to GBT innovations that greatly reduce complexity and power consumption of such architectures.
	www.gbtwireless.com /pages/tech/tech_b2.html (422 words)

	Diplexers - Microwave Encyclopedia - Microwaves101.com
		A diplexer can also be used to create a "matched" filter that is non-reflective outside of the intended passband.
		The problem with this circuit is that because the two frequencies are so close together, the bandwidth is very poor.
		Note that the impedance match at port 1 is excellent, from DC to 18 GHz.
	www.microwaves101.com /encyclopedia/diplexers.cfm (510 words)

	ECE 4660: Lab 6-Basic digital modulation and the linear receiver
		This filter will serve as our matched filter whos impulse response will be a time reversed version of the transmit filter impulse response.
		Connect one of the eye diagram blocks to the matched filter input and one to the matched filter output.
		The matched filter impulse response is a time reversed version of the NRZ pulse.
	www.engineering.usu.edu /classes/ece/4660/lab6/lab6.html (719 words)

	DRS Technologies Inc. - Average Matched Filter
		There are four 128 tap FIR filter banks that operate on 12 bit 2s complement data and use 12 bit fractional 2s complement coefficients at data rates up to 12.5 M samples/sec.
		The maximum number of sets of filter coefficients can be stored in nonvolatile flash memory and are loaded into RAM during power-up from which they can be loaded into the filter chips.
		This guarantees that the FIR filter chips are properly configured and loaded with the test coefficients which would not happen if no clock were present.
	www.drs.com /products/index.cfm?gid=17&productID=441 (840 words)

	Abstract (Site not responding. Last check: 2007-10-14)
		A matched filter is a device used to detect the presence and position of known objects in a scene.
		The optical matched filter being studied eliminates these problems in an attempt to generate a better filter.
		The filter has two necessary components: one to compute the complex conjugate of the phase and the other to store the complement of the magnitude.
	www.cis.rit.edu /research/thesis/bs/2000/hattenberger/abstract.html (224 words)

	(WO 01/84734) MATCHED FILTER AND RECEIVER FOR MOBILE RADIO COMMUNICATION SYSTEM (Site not responding. Last check: 2007-10-14)
		Partial filters 301 - 30N obtained by dividing number of matched filter taps by N are provided with a controller 341 for controlling which partial filters are enabled.
		On the basis of the maximum amount of delay, the controller 341 enables only the minimum number of partial filters 301 - 30n that are capable of executing an amount of computation that is required in one symbol period.
		The enabled partial filters are used multiple number of times per symbol period and the output, each time, integrated sample by sample.
	wipo.int /cgi-pct/guest/getbykey5?KEY=01/84734.011108&ELEMENT_SET=DECL (228 words)

	Mighty Dectectin' Power Rangers' Home Page (Site not responding. Last check: 2007-10-14)
		We find that the use of a matched filter designed for one image with the pre-processing approach does generally produce a detection spike when applied to another image, but false peaks on other features are also produced which are often larger than the peaks at the true eyes.
		Specifically, the filter produces the highest peak at the eye for which the filter is matched and produces a lesser peak at the other eye.
		While the detection of both eyes may usually be accomplished by the selection of a suitable detection threshold (particulary with the normalized approach), the magnitude of the primary and secondary peaks and the magnitude of the other high points in the image background varies widely from image to image.
	www.owlnet.rice.edu /~elec539/Projects97/mdpr/matched_filter_5.html (363 words)

	Matched Filter (Site not responding. Last check: 2007-10-14)
		The matched filter segment of our project is perhaps the easiest to code but the most difficult conceptually.
		This discovery has had many impressive results, not the least of which is the concept of a matched filter.
		A matched filter compares two signals and outputs a function describing the places at which the two signals are most like one another.
	cnx.org /content/m12464/latest (472 words)

	Thesis
		The matched filter is calculated to maximize the detection of the signal.
		Typically, optical matched filters record the complex-valued spectrum of the known object as magnitude and phase.
		According to the theory behind the optical matched filter, the phase of the filter must be conjugated.
	www.cis.rit.edu /research/thesis/bs/2000/hattenberger/thesis.html (4251 words)

	Firewall error messages
		For this record to be written, the matched filter rule must have log control set to yes.
		If the IP packet which matched this rule is a fragment, the port information appears for the header packet but is shown as zero for packets other than the header packet.
		If the IP packet which matched this rule is a fragment, the ICMP type/code information appears for the header packet but is shown as zero for packets other than the header packet.
	www.redbooks.ibm.com /pubs/html/as400/v4r5/ic2924/info/RZAGY10AFIREWALLERRMSGS.HTM (6437 words)

	A Matched filter for EME ( W6/PA0ZN)
		The best filter for detecting the presense of a known signal in white noise is a `matched filter,' where the received noisy signal is played against an uncorrupted version of itself --- much as an ideal local carrier is inserted for detecting SSB.
		This investigation of the matched filter for use in EME has revealed surprising (to me) information about the noise structure of amateur receivers.
		I found the simulated improvement in S/N due to a matched filter (of a given number of periods) was independent of the center frequency of the filter.
	www.nitehawk.com /rasmit/dsp10.html (819 words)

	☞ filter - Digital Filter (Site not responding. Last check: 2007-10-14)
		In electronics, a digital filter is any electronic filter that works by performing digital math operations on an intermediate form of a signal.
		The Digital Filter block independently filters each channel of the input signal with a specified digital IIR or FIR filter.
		A digital filter uses a digital processor to perform numerical calculations on sampled values of...
	www.all-filter.info /digitalfilter (610 words)

	Matched Filter Bounds for Wireless Communication Over Rayleigh Fading Dispersive Channels (Site not responding. Last check: 2007-10-14)
		This letter extends the theory of the matched filter bound for fading dispersive channels.
		The channel model is a standard time varying linear filter and the calculation of the matched filter bound is based on a Karhunen-Loève expansion of the received pulse spectrum when an isolated pulse is transmitted.
		J. Cavers, "On the validity of slow and moderate fading models for matched filter detection of Rayleigh fading signals", Canad.
	www.comsoc.org /comm/private/2001/sep/1525_49comm09-baas.html (376 words)

	ESTCP » Projects » UXO » Matched Filter Processor for Detection and Discrimination of Unexploded ... (Site not responding. Last check: 2007-10-14)
		In the optimum linear detection processor, a threshold is applied to the output of a prewhitening matched filter which compensates for any background correlation structure and then correlates the data with the expected signal.
		In this project, a Matched Filter AutoProcessor (MFAP) was developed that implements an optimal linear filter in a threshold-based UXO detection processor.
		The matched filter reduces uncertainty in the location of a target as well as improves detection of targets in magnetically noisy areas.
	www.estcp.org /projects/uxo/199918v.cfm (539 words)

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