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Examples of vibration pulses and their spectral distributions. (a) Binary vibration pulses of two periods, (b) spectral distribution of binary pulses of ten periods, (c) OFUV signal of two periods, (d) spectral distribution of OFUV signal of ten periods, (e) OFUV-PWM vibration pulses of two periods, (f) spectral distribution of OFUV-PWM pulses of ten periods.
