Fig. 14

(a) Temporal response of the proposed instrument’s AFE when a signal segment containing ERNA, recorded by a dc-coupled commercial instrument from the STN at 2048 SPS, is injected to the instrument’s AFE. The signal was recorded by the instrument’s AFE and was then digitized by the Powerlab hardware at 4 kSPS (wired transmission method). (b) Temporal response recorded by the proposed instrument with and without the application of a real-time digital high-pass filter at 30 Hz when a signal that contains high-frequency stimulation (HFS) pulses and ectopic activity was injected to the biopotential recording AFE’s input by a waveform generator (Agilent 33220A). The signal was sampled by means of our instrument at 1 kSPS, was wirelessly transmitted to the receiver module and was depicted on the computer using the Powerlab 16/35 hardware (wireless transmission method). (c) Detailed view of the successfully recorded ERNA of interest. (d) Detailed view of the successfully recorded ectopic activity. It is clear that the application of a digital high-pass filter enables real-time recording of a high-quality signal, which approximates the signal recorded by the dc-coupled commercial medical device