An undersampled signal sin(28t), SR=8.5 Hz 0.20.4 141.61.820 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 - 2 -1.5 - 1 -0.5 0 0.5 1 1.5 2 sin(28t), SR = 8.5 Hz An undersampled signal