Analog implementation of an active noise controller system for portable audio applications

Author

Reyes, Alexander H. ; Sánchez-Sinencio, Edgar ; Duque-Carrillo, Francisco

Author_Institution

Mixed Signal Wireless Dept., Texas Instrum. Inc., Dallas, TX, USA

Volume

48

Issue

4

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

400

Lastpage

404

Abstract

The active noise controller (ANC) system described here implements a practical design that significantly decreases background noise of signals common to most portable audio devices. This is achieved by a mixture of conventional ANC blocks with less traditional implementations, including a combined FIR/IIR structure using switched-capacitor blocks such as summers, integrators, multipliers, and delays. The proposed design also works as a stand-alone system and it has been successfully implemented on a 1.2-μm CMOS technology

Keywords

CMOS analogue integrated circuits; FIR filters; IIR filters; active noise control; analogue multipliers; audio equipment; delays; integrating circuits; summing circuits; switched capacitor filters; 1.2 micron; CMOS technology; active noise controller system; background noise; combined FIR/IIR structure; delays; integrators; multipliers; portable audio applications; stand-alone system; summers; switched-capacitor blocks; Acoustic noise; Active noise reduction; Background noise; Circuits; Control systems; Finite impulse response filter; IIR filters; Noise cancellation; Switches; Working environment noise;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.933803

Filename

933803