Title :
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
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;
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
DOI :
10.1109/CICC.2007.4405768
