The function of cochlear implant signal processing is to extract relevant sound information. The coding strategy will transmit this information in the most efficient way possible to the auditory nerve.

Neurelec was the first manufacturer in the prosthesis industry to use Fast Fourier Transform (FFT). This method of effective analysis is used in image processing and in digital hearing prosthesis.

Real time signal processing
Input dynamic range: 30 to 95 dB SPL.
Detection of the frequential and temporal features using FFT (Fast Fourier Transform) analysis between 65 Hz and 8 kHz.
130 Hz resolution similar to 64 digital filters.

Coding strategies
Dynamic detection of "n" channels among 20 depending on spectral features.
Energy coding on each frequency band by balanced biphasic pulses.
Adaptative stimulation frequency up to 1kHz per channel: fixed (MPIS) or proportional to fundamental F0 (FDS). Sequential stimulation.

Programming system DigiMap SP USB
Processor programming using DigiMap SP USB system. Windows 98 SE, ME, 2000
and XP compatible. USB link.
Objective measures with Electrical Auditory Brainstem Responses and
Digistim® SP system. Windows 98 SE, ME, 2000 and XP compatible.
Electrode impedance measurement by telemetry.