Emulation of Operational Amplifiers and Diodes in Audio Distortion Circuits

被引：32

作者：

Paiva, Rafael C. D. ^{[1
,2
]}

D'Angelo, Stefano ^{[1
]}

Pakarinen, Jyri ^{[3
]}

Valimaki, Vesa ^{[1
]}

机构：

[1] Aalto Univ, Sch Elect Engn, Dept Signal Proc & Acoust, Espoo 00076, Finland

[2] INdT, Nokia Inst Technol, BR-69093415 Manaus, Amazonas, Brazil

[3] Dolby Labs, S-11330 Stockholm, Sweden

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2012年 / 59卷 / 10期

关键词：

Acoustic signal processing; circuit simulation; harmonic distortion; music; nonlinear systems; WAVE DIGITAL-FILTERS;

D O I：

10.1109/TCSII.2012.2213358

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This brief presents a generic model to emulate distortion circuits using operational amplifiers and diodes. Distortion circuits are widely used for enhancing the sound of guitars and other musical instruments. This brief introduces a new model for an ideal operational amplifier that does not include implicit equations and is thus suitable for implementation using wave digital filters (WDFs). Furthermore, a novel WDF model for a diode is proposed using the Lambert W function. A comparison of output signals of the proposed models to those obtained from a reference simulation using SPICE shows that the distortion characteristics are accurately reproduced over a wide frequency range. Additionally, the proposed model enables real-time emulation of distortion circuits using ten multiplications, 22 additions, and two interpolations from a lookup table per output sample.

引用

页码：688 / 692

页数：5

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