Figure 5

Effect of applying a Hanning taper on the least squares spectrum. A simulated signal consisting of a fundamental and second harmonic of equal amplitudes sampled over 10 cycles (top left) is tapered with a Hanning window (top right). Corresponding least squares spectra (bottom) indicate that while the spectral location of the two peaks remains the same, the amplitudes are reduced and the bandwidths are wider. Sidelobes are also greatly diminished. Simulation and original drawings from C. Lee-Gierke. © Halberg Chronobiology Center.