Cochlear Implant Signal Processing ICs

Author

Swanson, Brett ; Van Baelen, Erika ; Janssens, Mark ; Goorevich, Michael ; Nygard, Tony ; Van Herck, Koen

Author_Institution

Cochlear Ltd, Lane Cove

fYear

2007

fDate

16-19 Sept. 2007

Firstpage

437

Lastpage

442

Abstract

The nucleus freedom cochlear implant system enables a profoundly deaf person to hear. The system consists of a surgically implanted stimulator and a battery-powered external sound processor. The processor is based on a 0.18 mum CMOS ASIC containing four DSP cores. The signal processing includes a two-microphone adaptive beamformer, a 22-channel quadrature FFT filterbank, multi-band automatic gain control, a psycho-acoustic masking model and non-linear compression. The key design challenge was power consumption.

Keywords

CMOS integrated circuits; acoustic signal processing; application specific integrated circuits; digital signal processing chips; ear; fast Fourier transforms; handicapped aids; hearing aids; ASIC; CMOS; FFT filterbank; cochlear implant signal processing; multiband automatic gain control; nonlinear compression; nucleus freedom cochlear implant system; psycho-acoustic masking model; sound processor; Adaptive control; Adaptive signal processing; Application specific integrated circuits; CMOS process; Cochlear implants; Deafness; Digital signal processing; Programmable control; Signal processing; Surgery;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2007. CICC '07. IEEE

Conference_Location

San Jose, CA

Print_ISBN

978-1-4244-1623-3

Electronic_ISBN

978-1-4244-1623-3

Type

conf

DOI

10.1109/CICC.2007.4405768

Filename

4405768