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Cochlear Implant Signal Processing ICs

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.