Kurzweil:Lowpass

From Sonikmatter

Lowpass is a type of Filter that allows low frequency's to pass while attenuating higher frequency's. Depending upon the complexity of the mathematics or electronics, the filter may have several parameter's that can be adjusted.

The simplest Lowpass Filter consits of a capacitor shunt between the signal and ground cable, with a resistor placed on the input side of the signal cable before it is joined to the capacitor. This is referred to as an RC Filter. For a simple RC Lowpass Filter the Critical frequency is given by 1/(2*Pi*R*C) where R is the Resistance in Ohms and C is the Capacitance in Farads.

More complex Filters allow the Cutoff frequency to be changed, by changing the resistance and capacitance in real time, or by changing the mathematical equation. More complex Filters still feature feedback and can have Resonance, which may or may not be changeable. Other parameter's that may be varied include Bandwidth, Flter rolloff, and Ripples in the passband. Some Filters may have a Linear Phase response, though these can't be implemented in real time, as they require knowledge of future events, to ensure linearity.

The Puppeteer 21:26, 29 Jun 2005 (EDT)

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