Spectrogram processing

Stft([signal, fft_size, window_type, ...])	Computes the short-time Fourier transform (STFT) of a signal.
Istft([stft])	Computes the inverse short-time Fourier transform (ISTFT) of a signal.
IsolateOrders([signal, rpm_profile, orders, ...])	Isolates the orders of a signal.