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A Regulated Low-Pass Filter Based on Pulse Width Modulation

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Regulated filters are often used in disk recording systems to prevent cutting of extreme high-frequency transients which may be impossible to play back. The paper describes a system utilizing an active Bessel-type filter in which the resistive components are varied by a pulse-width modulated square-wave signal of supersonic frequency.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=1703

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