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AUBIOONSET(1)		      aubio User's manual		 AUBIOONSET(1)

NAME
       aubioonset - a command line tool	to extract musical onset times

SYNOPSIS
       aubioonset source
       aubioonset [[-i]	source]	[-o sink]
		  [-r rate] [-B	win] [-H hop]
		  [-O method] [-t thres]
		  [-T time-format]
		  [-s sil] [-m]	[-f]
		  [-j] [-N miditap-note] [-V miditap-velo]
		  [-v] [-h]

DESCRIPTION
       aubioonset  attempts  to	 detect	onset times, the beginning of discrete
       sound events, in	audio signals.

       When started with an input  source  (-i/--input),  the  detected	 onset
       times are given on the console, in seconds.

       When  started  without  an  input  source,  or  with  the  jack	option
       (-j/--jack), aubioonset starts in jack mode.

OPTIONS
       This program follows the	usual GNU command line syntax, with  long  op-
       tions  starting	with two dashes	(--). A	summary	of options is included
       below.

       -i, --input source
	      Run analysis on this audio  file.	 Most  uncompressed  and  com-
	      pressed are supported, depending on how aubio was	built.

       -o, --output sink
	      Save results in this file. The file will be created on the model
	      of the input file. Onset times are marked	by a short  wood-block
	      like sound.

       -r, --samplerate	rate
	      Fetch  the  input	 source, resampled at the given	sampling rate.
	      The rate should be specified in Hertz as an integer. If  0,  the
	      sampling	rate  of the original source will be used. Defaults to
	      0.

       -B, --bufsize win
	      The size of the buffer to	analyze, that is  the  length  of  the
	      window  used for spectral	and temporal computations. Defaults to
	      512.

       -H, --hopsize hop
	      The number of samples between  two  consecutive  analysis.   De-
	      faults to	256.

       -O, --onset method
	      The  onset detection method to use. See ONSET METHODS below. De-
	      faults to	'default'.

       -t, --onset-threshold thres
	      Set the threshold	value for the onset peak picking.  Values  are
	      typically	 in  the  range	[0.001,	0.900].	Lower threshold	values
	      imply more onsets	detected. Increasing this threshold should re-
	      duce the number of incorrect detections. Defaults	to 0.3.

       -M, --minioi value
	      Set  the	minimum	inter-onset interval, in seconds, the shortest
	      interval between two consecutive onsets. Defaults	to 0.020

       -s, --silence sil
	      Set the silence threshold, in dB,	under which the	onset will not
	      be  detected.  A	value of -20.0 would eliminate most onsets but
	      the loudest ones.	A value	of -90.0 would select all onsets.  De-
	      faults to	-90.0.

       -T, --timeformat	format
	      Set time format (samples,	ms, seconds). Defaults to seconds.

       -m, --mix-input
	      Mix source signal	to the output signal before writing to sink.

       -f, --force-overwrite
	      Overwrite	output file if it already exists.

       -j, --jack
	      Use  Jack	 input/output.	You  will  need	a Jack connection con-
	      troller to feed aubio some signal	and listen to its output.

       -N, --miditap-note
	      Override note value for MIDI tap.	Defaults to 69.

       -V, --miditap-velop
	      Override velocity	value for MIDI tap. Defaults to	65.

       -h, --help
	      Print a short help message and exit.

       -v, --verbose
	      Be verbose.

ONSET METHODS
       Available methods are:

       default
	      Default distance,	currently hfc

       Default:	'default' (currently set to hfc)

       energy Energy based distance

       This function calculates	the local energy of the	input spectral frame.

       hfc    High-Frequency content

       This method computes the	High Frequency	Content	 (HFC)	of  the	 input
       spectral	 frame.	 The resulting function	is efficient at	detecting per-
       cussive onsets.

       Paul Masri. Computer modeling of	Sound for Transformation and Synthesis
       of Musical Signal. PhD dissertation, University of Bristol, UK, 1996.

       complex
	      Complex domain onset detection function

       This function uses information both in frequency	and in phase to	deter-
       mine changes in the spectral content that might correspond  to  musical
       onsets.	 It  is	 best  suited  for  complex signals such as polyphonic
       recordings.

       Christopher Duxbury, Mike E. Davies, and	Mark B.	Sandler.
	      Complex domain onset detection for musical signals. In  Proceed-
	      ings  of	the  Digital  Audio Effects Conference,	DAFx-03, pages
	      90-93, London, UK, 2003.

       phase  Phase based onset	detection function

       This function uses information both in frequency	and in phase to	deter-
       mine  changes  in the spectral content that might correspond to musical
       onsets. It is best  suited  for	complex	 signals  such	as  polyphonic
       recordings.

       Juan-Pablo Bello, Mike P. Davies, and Mark B. Sandler.
	      Phase-based  note	onset detection	for music signals. In Proceed-
	      ings of the IEEE International Conference	 on  Acoustics	Speech
	      and Signal Processing, pages 441A444, Hong-Kong, 2003.

       specdiff
	      Spectral difference onset	detection function

       Jonhatan	 Foote and Shingo Uchihashi. The beat spectrum:	a new approach
       to rhythm analysis. In IEEE International Conference on Multimedia  and
       Expo (ICME 2001), pages 881A884,	Tokyo, Japan, August 2001.

       kl     Kulback-Liebler onset detection function

       Stephen	Hainsworth  and	Malcom Macleod.	Onset detection	in music audio
       signals.	In Proceedings of the International Computer Music  Conference
       (ICMC), Singapore, 2003.

       mkl    Modified Kulback-Liebler onset detection function

       Paul  Brossier, ``Automatic annotation of musical audio for interactive
       systems'', Chapter 2, Temporal segmentation,  PhD  thesis,  Centre  for
       Digital music, Queen Mary University of London, London, UK, 2006.

       specflux
	      Spectral flux

       Simon Dixon, Onset Detection Revisited, in ``Proceedings	of the 9th In-
       ternational Conference on Digital Audio Effects'' (DAFx-06),  Montreal,
       Canada, 2006.

SEE ALSO
       aubiopitch(1),  aubiotrack(1),  aubionotes(1),  aubioquiet(1),  aubiom-
       fcc(1), and aubiocut(1).

AUTHOR
       This manual page	was written by Paul Brossier <piem@aubio.org>. Permis-
       sion  is	 granted to copy, distribute and/or modify this	document under
       the terms of the	GNU General Public License as published	 by  the  Free
       Software	 Foundation,  either version 3 of the License, or (at your op-
       tion) any later version.

aubio 0.4.7			09 August 2020			 AUBIOONSET(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ONSET METHODS | SEE ALSO | AUTHOR

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