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DEMO_BPFRAMEMUL - Frame multiplier acting as a time-varying bandpass filter

Description

This demo demonstrates creation and effect of a Gabor multiplier. The multiplier performs a time-varying bandpass filtering. The band-pass filter with center frequency changing over time is explicitly created but it is treated as a "black box" system. The symbol is identified by "probing" the system with a white noise and dividing DGT of the output by DGT of the input element-wise. The symbol is smoothed out by a 5x5 median filter.

demo_bpframemul_1.png

The symbol of the multiplier.

This figure shows a symbol used in the Gabor multiplier.
demo_bpframemul_2.png

Spectroram obtained by re-analysis of the test signal after applying the multiplier

This figure shows a spectrogram of the test signal after applying the estimated Gabor multiplier.