DEMO_BPFRAMEMUL Frame multiplier acting as a time-varying bandpass filter
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.
Figure 1: The symbol of the multiplier.
This figure shows a symbol used in the Gabor multiplier.
Figure 2: 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.
Package: ltfat