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- H. Purwins, B. Blankertz,
and K. Obermayer. Constant Q Profiles for Tracking Modulations in Audio
Data.
.
In Proceedings of the International Computer Music Conference,
pages 274-276, 2001.
Cq-profiles are 12-dimensional vectors, each component referring to
a pitch class. They can be employed to represent keys. Cq-profiles are
calculated with the constant Q filter bank (Brown and Puckette 92). They have
the following advantages: (i) They correspond to probe tone ratings. (ii)
Calculation is possible in real-time. (iii) Stability is obtained with
respect to sound quality. (iv) They are transposable. Cq-profiles are
reliably applied to modulation tracking by introducing a special distance
measure.
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