Charm Engineering Co. Ltd CAI001-BT33 Benutzerhandbuch
CORITICAL ACTIVITY INDEX
|
22
2.1.3 Frequency Response
Input signal condition
•
Amplitude: 200mVpp (Setting waveform generator as 100mVpp)
•
Frequency: 2/10/30/40/50(2~48)Hz (EEG), 70/80/100/130/140(80~130Hz)(EMG)
•
Waveform: Sine wave
Measurement method
•
Test connection diagram is shown in the above diagram.
•
Actual size of signal input is 106uVp.
•
Measures the amplitude of detected waveform with a viewer program by changing
frequency of the waveform generator.
frequency of the waveform generator.
•
Obtain benefit (dB unit) per each frequency from the measured amplitude results.
•
Benefit = 20*log (numerical benefit)
Measurement results
Results of brainwave signal channel and electromyogram signal channel measurement are
shown in below figure.
(Measurement value at –3 dB passband in EEG, EMG frequency response characteristic test was
at least 70.7 uVp.)
Results of brainwave signal channel and electromyogram signal channel measurement are
shown in below figure.
(Measurement value at –3 dB passband in EEG, EMG frequency response characteristic test was
at least 70.7 uVp.)
Figure 2.4 Frequency response curve of brainwave signal channel. -3dB passband: 2~48Hz
Figure 2.5 Frequency response curve of electromyogram signal channel. 70~130Hz at -3dB
frequency band