A filter used to attenuate frequencies below a particular frequency called the cut-off frequency. Frequencies below the cut-off frequency are passed easily through the filter.
A filter used to attenuate frequencies below a particular frequency called the cut-off frequency. Frequencies higher than the cut-off frequency are passed easily through the filter.
A filter used to attenuate frequencies below and above a range of frequencies called the bandwidth or passband of the filter. Any signal with frequency within that bandpass range is passed easily thought the filter, while any frequency outside the bandpass is attenuates or reduced.
A band-reject filter (also known as band-stop or notch filter band-reject filter) is used to attenuate a range of frequencies, allowing all other frequencies to pass.
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Bessel filters are active filters with a passband that maximizes the group delay at zero frequency, thus showing a constant group delay in the passband. Group delay is a measurement of the time it takes for a signal to move between two points in a network. A constant group delay in the passband of filters implies that for all signals with frequencies in the passband the time delay will be the same. This fact is important in many applications, in particular in audio, video and radar applications.
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Restriction of Hazardous Substances (RoHS) is a European Union (EU) directive that requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of the following hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl and polybrominated diphenyl ether. RoHS will become effective on July 1, 2006.
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End of Life Vehicles (ELV) Directive requires that certain automotive products be free (except for trace impurities) of mercury, cadmium and lead as of 7/01/2003. Lead can still be used as an alloying additive in copper, steel and aluminum and in solderable applications.
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