Integration using the lattice filter proposed by Dr. Kinoshita (see reference). This will simulate a seismograph with a pendulum. You need to specify low-cut frequency that corresponds to the natural frequency of the pendulum.
Trapezoid rule (linear)
Time domain integration using trapezoid rule. Baseline correction on velocity will be made using a line.
Trapezoid rule (bi-linear)
Time domain integration using trapezoid rule. Baseline correction on velocity will be made using a bi-line. Time lengths to fit the first line and the second line must be given respectively.
Trapezoid rule (parabola)
Time domain integration using trapezoid rule. Baseline correction on velocity will be made using a parabola.
FFT
Frequency domain integration using Fast Fourier Transform (FFT). Low-cut frequency must be specified.