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US 4,383,229 AGranted
Resonant filter clipper circuit
AssigneeCircuit Research Labs, Inc.
InventorRonald R. Jones
Life of this patent
Estimating the term…
Abstract
A circuit for peak limiting an audio signal comprises a first "M" derived filter, a first clipping circuit, a second-order low pass filter, a second clipping circuit and a second "M" derived filter. Each "M" derived filter includes a series resonant shunt leg for eliminating clipping harmonics within selected frequency ranges depending upon the resonant frequency of each shunt leg.
Claims12
A circuit for peak limiting an input signal having an input and an output, comprising:
- a first clipping circuit for clipping said input signal at a predetermined voltage;
- first filter means coupled to said input and to said clipping circuit for eliminating clipping harmonics within a first range of frequencies, said first filter means including a first series resonant circuit which is resonant at a frequency approximately intermediate said first range;
- second filter means having an input coupled to the output of said first filter means for attenuating frequencies above a predetermined frequency;
- a second clipping circuit coupled to the output of said circuit;
- and
- third filter means coupled to the output of said second filter means, to said second clipping circuit and to the output of said circuit for eliminating clipping harmonics within a second range of frequencies, said third filter means including a second series resonant circuit which is resonant at a frequency intermediate said second range.
3 more elements
Dependencies are inferred from the claim text.