Figure 4
The main components of the EAP recording system. Illustration of the main components of the EAP recording system integrated in the MED-EL PULSARCI100cochlear implant (E1...E12: measuring electrodes, EAP_GND: reference electrode for EAP recordings, amp: amplifier, SDM: sigma-delta modulator, RAM: 2048 bit storage, C: transmitter and receiver coils). The recording window has a maximum duration of approximately 1.7 ms which starts after an adjustable interval after the preceding stimulation pulse. The SDM can be programmed in standard or adaptive mode. The "Research Interface Box 2" (RIB2) is used as an interface with a computer.