Chris@366: 
Chris@366: Constant-Q Library
Chris@366: ==================
Chris@366: 
Chris@366: A C++ library and Vamp plugin implementing the Constant-Q transform
Chris@366: of a time-domain signal.
Chris@366: 
Chris@366: https://code.soundsoftware.ac.uk/projects/constant-q-cpp
Chris@366: 
Chris@366: The Constant-Q transform is a time-to-frequency-domain transform
Chris@366: related to the short-time Fourier transform, but with output bins
Chris@366: spaced logarithmically in frequency, rather than linearly. The output
Chris@366: bins are therefore linearly spaced in terms of musical pitch.
Chris@366: 
Chris@366: This library provides:
Chris@366: 
Chris@366:  * Forward transform: time-domain to complex Constant-Q bins
Chris@366:  * Forward spectrogram: time-domain to interpolated Constant-Q
Chris@366:    magnitude spectrogram
Chris@366:  * Inverse transform: complex Constant-Q bins to time domain
Chris@366: 
Chris@366: The Vamp plugin provides:
Chris@366: 
Chris@366:  * Constant-Q magnitude spectrogram with high and low frequency
Chris@366:    extents defined in Hz
Chris@366:  * Constant-Q magnitude spectrogram with high and low frequency
Chris@366:    extents defined as MIDI pitch values
Chris@366:  * Pitch chromagram obtained by folding a Constant-Q spectrogram
Chris@366:    around into a single-octave range
Chris@366: 
Chris@366: The method is drawn from Christian Schörkhuber and Anssi Klapuri,
Chris@366: "Constant-Q transform toolbox for music processing", SMC 2010. See the
Chris@366: file CITATION for details. If you use this code in research work,
Chris@366: please cite this paper.
Chris@366: 
Chris@366: The implementation is reasonably fast and is causal, operating
Chris@366: block-by-block on the input, though with quite high latency
Chris@366: depending on the frequency range specified. By default it produces
Chris@366: output at a higher time resolution than some other implementations,
Chris@366: using multiple kernel atoms per time block. The inverse transform is
Chris@366: approximate rather than exact (see the paper for details).
Chris@366: 
Chris@366: The C++ implementation is by Chris Cannam, Copyright 2014-2015 Queen
Chris@366: Mary, University of London.
Chris@366: 
Chris@366: The library is provided under a liberal BSD/MIT-style open source
Chris@366: licence. See the file COPYING for more information.
Chris@366: