comparison test/TestFeatureExtractor.cpp @ 128:3f32a88ee15a refactors

Comment

 	//
 	// * one bin of value 250 (= 10^2 + 5^2), if the two input
 	// bins are distinct but their output chroma are not
 	//
 	// * one bin of value 450 (= 15^2 + 15^2), if the input bins
-	// are not distinct
+	// are not distinct (the feature extractor sums energies
+	// rather than magnitudes so as to integrate energy for a
+	// partial in the face of spectral leakage)
 	// 
 	// The bin corresponding to each input frequency is that of
 	// its semitone value (with C=0), except that input bin
 	// frequencies less than 362Hz are shepherded into the
 	// separate bin 0 (see docs in FeatureExtractor.h)

 	//
 	// * one bin of value 250 (= 10^2 + 5^2), if the two input
 	// bins are distinct but their output bins are not
 	//
 	// * one bin of value 450 (= 15^2 + 15^2), if the input bins
-	// are not distinct
+	// are not distinct (the feature extractor sums energies
+	// rather than magnitudes so as to integrate energy for a
+	// partial in the face of spectral leakage)
 	//
 	// The first 34 input bins (i.e. up to and including bin 33,
 	// 733Hz, MIDI pitch 77.something) are mapped linearly, those
 	// above that and up to MIDI pitch 127 (12544Hz) are mapped
 	// logarithmically, remaining bins are all mapped into the