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	Band-stop filter - Wikipedia, the free encyclopedia
		In signal processing, a band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a range to very low levels.
		Typically, the width of the stopband is less than 1 to 2 decades (that is, the highest frequency attenuated is less than 10 to 100 times the lowest frequency attenuated).
		In the audio band, a notch filter uses high and low frequencies that may be only semitones apart.
	en.wikipedia.org /wiki/Notch_filter (182 words)

	Encyclopedia: Band-pass filter (Site not responding. Last check: 2007-10-22)
		A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.
		An RLC circuit (sometimes known as resonant or tuned circuit) is an electrical circuit comprising a resistor (R), an inductor (L), and a capacitor (C), connected in series or in parallel.
		of a frequency band is the resonant frequency, at which the gain of the filter is maximum.
	www.nationmaster.com /encyclopedia/Band_pass-filter (891 words)

	Band-pass filter -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		This is known as the roll-off, and is usually expressed in (A logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity) dB per octave.
		Often a mistake is made in calculating the (The sum of the values of a random variable divided by the number of values) arithmetic mean as the passed band:
		If, for instance, we are looking for the center frequency of the telphone audio band from 300 Hz to 3300 Hz, we get (3300 + 300) / 2 = "1800 Hz" for the false arithmetic mean calculation, but the root of 300 x 3300 = "995" Hz with the correct geometric mean formula.
	www.absoluteastronomy.com /encyclopedia/b/ba/band-pass_filter.htm (387 words)

	ipedia.com: Filter design Article (Site not responding. Last check: 2007-10-22)
		The basic functionality must be decided first, like low-pass, high-pass, band-pass, all-pass, or more complex functions.
		A high-pass filter passes high frequencies fairly well; it is helpful as a filter to block any unwanted low frequency components.
		A band-pass filter passes a limited range of frequencies.
	www.ipedia.com /filter_design.html (506 words)

	Band Pass
		A band pass filter passes a range of frequencies while rejecting frequencies outside the upper and lower limits of the passband.
		The range of frequencies to be passed is called the passband and extends from a point below the center frequency to a point ab
		This point is.7071 the amplitude of the pass band.
	www.electronicsinfoline.com /CircuitBook/Filter_Schematics/Band_Pass (165 words)

	Band Pass Filter (Site not responding. Last check: 2007-10-22)
		Find Optical Bandpass Filters, bandpass filter, passive component, band pass fil...
		Bandpass Filter - Band Reject Filter - Bandpass Filter Design...
		The SETI League, Inc. Water-Hole Band Pass Filter...
	www.scienceoxygen.com /gadget/122.html (107 words)

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