Figure 5.

Functional block diagram of the Continuous Interleaved Sampling (CIS) sound-processing strategy. In this example, six bandpass filters (BPFs) are used to enable the short-term (or instantaneous) levels in each of six partially overlapping frequency bands to be estimated. The filters have center frequencies that are typically spaced regularly along a logarithmic scale. The levels at the outputs of the filters are converted into appropriate current levels of electric stimulation. The digital data transmitted to the implant specify the currents to be delivered by each of the electrodes. The resulting stimulation pattern comprises a series of interleaved pulses delivered at a constant rate.