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.

Author: Vestergaard, T.
Affiliation: Ortofon Manufacturing A/S, Valby, Denmark
AES Convention: 46 (September 1973) Paper Number: 923
Publication Date: September 1, 1973

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