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

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3 Author(s)
Reyes, A.H. ; Mixed Signal Wireless Dept., Texas Instrum. Inc., Dallas, TX, USA ; Sanchez-Sinencio, E. ; Duque-Carrillo, F.

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

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 4 )