Method for RIAA correction of audio signal with use of transformer and capacitor
AssigneeOutsource Technologies, Inc.
InventorAlexander Sokolov
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Abstract
RIAA correction of audio frequency signals is disclosed. A RIAA-correcting pre-amplifier uses a transformer having a primary winding and two or more secondary windings, with two of the secondary windings playing an essential role in RIAA-correction. Frequency correction of a signal coming from one of the secondary windings is carried out on a resistance and capacitance circuit (RC-type of correction), while frequency correction of a signal coming from another of the secondary windings is carried out with the use of an inductance and resistance circuit (RL type of correction).
Claims9
A method of RIAA correction of audio frequency signals, comprising using in a RIAA-correcting pre-amplifier a transformer having a primary winding and two or more secondary windings, with two of the secondary windings playing an essential role in RIAA-correction, wherein frequency correction of a signal coming from one of the secondary windings is carried out on a resistance and capacitance circuit (RC-type of correction), while frequency correction of a signal coming from another of the secondary windings is carried out with the use of an inductance and resistance circuit (RL type of correction).
A circuit for RIAA correction of audio frequency signals, comprising:
- a first transformer having a primary winding, a first secondary winding and a second secondary winding having a leakage inductance L2;
- a first resistor having a resistance R1 and a capacitor having a capacitance C1 electrically connected to the first secondary winding;
- and
- a second resistor electrically connected in to the second secondary winding, the second resistor having a resistance R2,
- wherein a leakage inductance of the first secondary winding is sufficiently small that a correction time constant z1 for the first secondary winding is approximately equal to a product of R1 and C1,
- wherein a correction time constant t2 for the second secondary winding is given by a ratio L2/R2.
Dependencies are inferred from the claim text.