Fig. 8

Experimental setup and block diagram of the system for ECR acquisition and recording. Patient asleep inside the audiometric test booth (D) and using the device in everyday operating mode. Four scalp EEG electrodes for two differential recording channels. (A) Stimulation module. Consist of a digital programmable tone pip’s generator, digital attenuator, audio power amplifier and loudspeaker. (B) Acquisition module. Consist of two EEG amplifiers, 30–500 Hz wide band, 0.1–300 Hz LPF, 12 dB/Octave and A/D converter. (C) Personal computer