The constant-Q transform (CQT) is a valuable tool for music information retrieval, e.g. for chroma calculation and harmonic analysis. In this E-Brief, we propose a block based, real-time capable, efficient analysis algorithm resting upon a subsampling technique performed with fast Fourier transform. In addition, advanced features such as time resolution enhancement towards lower frequencies and a robust CQT-based tuner are presented. Finally a reference-implementation in C++ in form of a VST3-Plugin is introduced. The plugin's source code will be available openly for further development.

Authors: Holzmüller, Felix; Bereuter, Paul; Merz, Philipp; Rudrich, Daniel; Sontacchi, Alois
Affiliations: University of Music and Performing Arts Graz; Graz University of Technology(See document for exact affiliation information.)
AES Convention: 148 (May 2020) eBrief:567
Publication Date: May 28, 2020
Subject: Signal Processing

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