Enhancing the Usability of Brain-Computer Interface Systems

Figure 2

Example of time series simulation waves and their spectra: (a) a sinusoidal carrier wave at 50 Hz, (b) a message wave at 11 Hz, and (c) an amplitude-modulated signal, and (d) a frequency-modulated signal. Note that the spectra for the modulated signals show peaks at the sidebands at the carrier frequency ± message frequency.

(a)

(b)

(c)

(d)