Following the great success of our MELODIA - Melody Extraction vamp plugin, we are very pleased to announce the launch of the HPCP - Harmonic Pitch Class Profile vamp plug-in.

The plug-in provides a simple implementation of our chroma feature extraction algorithm which has been used in different applications, e.g. chord detection, key estimation, cover version identification and music classification. Full details of the algorithm can be found in the following papers:

• Gomez, E. 2006. 'Tonal description of music audio signals', PhD thesis, Universitat Pompeu Fabra.
• Gomez, E. Bonada, J. 2005. 'Tonality visualization of polyphonic audio' Proceedings of International Computer Music Conference 2005, pp. 77-86; Barcelona.

NOTE: The main difference between this implementation and the original algorithm is that this implementation does not perform automatic tuning frequency estimation. The reference tuning frequency is defined as an input parameter.

The plug-in is available online for free download (non-commercial purposes). We hope it will serve the research community for evaluating different approaches for chroma feature extraction and for its further exploitation in higher-level music information retrieval tasks.

We are very interested in receiving feedback from the community, please let us know what you think!

HPCP vamp plug-in website