Marginal Hilbert Spectrum

This function find the Marginal Hilbert Spectrum using Hilbert Spectrum

The inputs are the imf's amplitud and the imfs instantaneous frequency. The outputs are the Marginal Hilbert Spectrum (mhs) amplitude vector and a frequency vector corresponding to the amplitude vector. In order to obtain a more interpretable graph the instantaneous frequency vector can be quantized grouping values of frequency Which are very close. for this, a frequency resolution and the sample rate are required for the frequency.