[LAA] Constant-Q library and Vamp plugin

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To: <linux-audio-dev@...>, <linux-audio-announce@...>
Date: Wednesday, August 13, 2014 - 12:58 pm

Announcing a new C++ library and Vamp plugin implementing the Constant-Q
transform of a time-domain signal.


The Constant-Q transform is a time-to-frequency-domain transform related
to the short-time Fourier transform, but with output bins spaced
logarithmically in frequency, rather than linearly. The output bins are
therefore linearly spaced in terms of musical pitch. The Constant-Q is
useful as a preliminary transform in various other methods such as note
transcription and key estimation techniques.

This library provides:

* Forward transform: time-domain to complex Constant-Q bins
* Forward spectrogram: time-domain to interpolated Constant-Q magnitude
* Inverse transform: complex Constant-Q bins to time domain

The Vamp plugin provides:

* Constant-Q magnitude spectrogram with high and low frequency extents
defined in Hz
* Constant-Q magnitude spectrogram with high and low frequency extents
defined as MIDI pitch values
* Pitch chromagram obtained by folding a Constant-Q spectrogram around
into a single-octave range

The code is provided with full source under a liberal licence, and
plugin binaries are provided for Windows, OS/X, and Linux.

The method is drawn from Christian Schörkhuber and Anssi Klapuri,
"Constant-Q transform toolbox for music processing", SMC 2010. See the
file CITATION for details. If you use this code in research work, please
cite this paper.
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