What are some alternatives to Spectrogram charts?
The ltfatpy 1.0.16 package 


  is a partial Python port of the Large Time/Frequency Analysis Toolbox
  (LTFAT), a MATLAB®/Octave toolbox for working with time-frequency
  analysis and synthesis.


Among linear and quadratic time-frequency methods, there is a large number of options for sharper analysis tools converting a 1D signal into 2D data. You can even get more information by decomposing onto 3D or 4D spaces (coming back on that later). Quadratic (or higher-order) representations are usually more difficult to invert than linear ones. 

And here is a documentation for ltfatpy.