ENLARGE Choose Target Entropy (bits) 4 3 2 1.5 1 .75 .5 .25 |
Using a compression algorithm
written by Chris Brislawn of Los Alamos' CIC-3, I performed eight compression
experiments on each of the thirteen signals.
The spectrogram on the right has been compressed with a target entropy of 2 (measured in bits). You can explore what the other levels of compression have done to the spectrogram by choosing the appropriate target entropy to the left. More evident now is the time/frequency-localization. The lightning signature seems to remain relatively in tact while the background noise is being "averaged" away. More conclusive proof of this can be seen in the statistical analysis. The time/frequency-localization characteristic of wavelet compression has preserved the parameters from each lightning signature (contrast, TEC, lag, etc.) which we would like to archive. |
