Title :
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
fDate :
4/1/2001 12:00:00 AM
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;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
