c@126: 
c@126: Constant-Q Library
c@126: ==================
c@126: 
c@130: A C++ library and Vamp plugin implementing the Constant-Q transform
c@130: of a time-domain signal.
c@126: 
c@126: https://code.soundsoftware.ac.uk/projects/constant-q-cpp
c@126: 
c@126: The Constant-Q transform is a time-to-frequency-domain transform
c@126: related to the short-time Fourier transform, but with output bins
c@126: spaced logarithmically in frequency, rather than linearly. The output
c@126: bins are therefore linearly spaced in terms of musical pitch.
c@126: 
c@126: This library provides:
c@126: 
c@126:  * Forward transform: time-domain to complex Constant-Q bins
c@126:  * Forward spectrogram: time-domain to interpolated Constant-Q
c@126:    magnitude spectrogram
c@126:  * Inverse transform: complex Constant-Q bins to time domain
c@126: 
c@163: The Vamp plugin provides:
c@163: 
c@163:  * Constant-Q magnitude spectrogram with high and low frequency
c@163:    extents defined in Hz
c@163:  * Constant-Q magnitude spectrogram with high and low frequency
c@163:    extents defined as MIDI pitch values
c@163:  * Pitch chromagram obtained by folding a Constant-Q spectrogram
c@163:    around into a single-octave range
c@163: 
c@126: The method is drawn from Christian Schörkhuber and Anssi Klapuri,
c@126: "Constant-Q transform toolbox for music processing", SMC 2010. See the
c@126: file CITATION for details. If you use this code in research work,
c@126: please cite this paper.
c@126: 
c@126: The implementation is reasonably fast and is causal, operating
c@126: block-by-block on the input, though with quite high latency
c@126: depending on the frequency range specified. By default it produces
c@126: output at a higher time resolution than some other implementations,
c@126: using multiple kernel atoms per time block. The inverse transform is
c@126: approximate rather than exact (see the paper for details).
c@126: 
c@126: The C++ implementation is by Chris Cannam, Copyright 2014 Queen Mary,
c@126: University of London.
c@126: 
c@126: The library is provided under a liberal BSD/MIT-style open source
c@126: licence. See the file COPYING for more information.
c@126: