Placed the method convert_to_decibels outside AuditorySpectrogram as it's useful elsewhere. Corrected AuditorySpectrogram and OctaveSpectrogramWithAmplification, their frequency ranges were counting backwards. Changed all spectrogram methods to use the new _shape_response method from PowerSpectrum. Fixed OctaveSpectrogramWithAmplification so it actually works, changed its default amplification to 15%.
Placed the method convert_to_decibels outside AuditorySpectrogram as it's useful elsewhere. Corrected AuditorySpectrogram and OctaveSpectrogramWithAmplification, their frequency ranges were counting backwards. Changed all spectrogram methods to use the new _shape_response method from PowerSpectrum. Fixed OctaveSpectrogramWithAmplification so it actually works, changed its default amplification to 15%.

git-svn-id: 1090b387d452580804210ae271d3c35ba515bde4@11692 0ce056cd-c842-0410-9ff1-d0633a95805a

jesuscript/topo-mpi,jesuscript/topo-mpi,jesuscript/topo-mpi,jesuscript/topo-mpi,jesuscript/topo-mpi