1AUBIOPITCH(1)                 aubio User's manual                AUBIOPITCH(1)
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NAME

6       aubiopitch - a command line tool to extract musical pitch
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SYNOPSIS

9       aubiopitch source
10       aubiopitch [[-i] source] [-o sink]
11                  [-r rate] [-B win] [-H hop]
12                  [-p method] [-u unit] [-l thres]
13                  [-T time-format]
14                  [-s sil] [-f]
15                  [-v] [-h] [-j]
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17

DESCRIPTION

19       aubiopitch  attempts to detect the pitch, the perceived height of a mu‐
20       sical note.
21
22       When started with an input source (-i/--input), the detected pitch  are
23       printed on the console, prefixed by a timestamp in seconds. If no pitch
24       candidate is found, the output is 0.
25
26       When  started  without  an  input  source,  or  with  the  jack  option
27       (-j/--jack), aubiopitch starts in jack mode.
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OPTIONS

30       This  program  follows the usual GNU command line syntax, with long op‐
31       tions starting with two dashes (--). A summary of options  is  included
32       below.
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34       -i, --input source
35              Run  analysis  on  this  audio  file. Most uncompressed and com‐
36              pressed are supported, depending on how aubio was built.
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38       -o, --output sink
39              Save results in this file. The file will be created on the model
40              of  the  input file. The detected frequency is played at the de‐
41              tected loudness.
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43       -r, --samplerate rate
44              Fetch the input source, resampled at the  given  sampling  rate.
45              The  rate  should be specified in Hertz as an integer. If 0, the
46              sampling rate of the original source will be used.  Defaults  to
47              0.
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49       -B, --bufsize win
50              The  size  of  the  buffer to analyze, that is the length of the
51              window used for spectral and temporal computations. Defaults  to
52              2048.
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54       -H, --hopsize hop
55              The  number  of  samples  between two consecutive analysis.  De‐
56              faults to 256.
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58       -p, --pitch method
59              The pitch detection method to use. See PITCH METHODS below.  De‐
60              faults to 'default'.
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62       -u, --pitch-unit unit
63              The  unit  to  be used to print frequencies. Possible values in‐
64              clude midi, bin, cent, and Hz. Defaults to 'Hz'.
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66       -l, --pitch-tolerance thres
67              Set the tolerance for the  pitch  detection  algorithm.  Typical
68              values  range between 0.2 and 0.9. Pitch candidates found with a
69              confidence less than this threshold will not  be  selected.  The
70              higher the threshold, the more confidence in the candidates. De‐
71              faults to unset.
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73       -s, --silence sil
74              Set the silence threshold, in dB, under which the onset will not
75              be  detected.  A  value of -20.0 would eliminate most onsets but
76              the loudest ones. A value of -90.0 would select all onsets.  De‐
77              faults to -90.0.
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79       -T, --timeformat format
80              Set time format (samples, ms, seconds). Defaults to seconds.
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82       -m, --mix-input
83              Mix source signal to the output signal before writing to sink.
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85       -f, --force-overwrite
86              Overwrite output file if it already exists.
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88       -j, --jack
89              Use  Jack  input/output.  You  will  need a Jack connection con‐
90              troller to feed aubio some signal and listen to its output.
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92       -h, --help
93              Print a short help message and exit.
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95       -v, --verbose
96              Be verbose.
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PITCH METHODS

99       Available methods are:
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101       default
102              use the default method
103
104       Currently, the default method is set to yinfft.
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106       schmitt
107              Schmitt trigger
108
109       This pitch extraction method implements a Schmitt trigger  to  estimate
110       the  period  of  a  signal. It is computationally very inexpensive, but
111       also very sensitive to noise.
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113       fcomb  a fast harmonic comb filter
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115       This pitch extraction method implements a fast harmonic comb filter  to
116       determine the fundamental frequency of a harmonic sound.
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118       mcomb  multiple-comb filter
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120       This  fundamental  frequency  estimation  algorithm implements spectral
121       flattening, multi-comb filtering and peak histogramming.
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123       specacf
124              Spectral auto-correlation function
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126       yin    YIN algorithm
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128       This algorithm was developed by A. de Cheveigne and H. Kawahara and was
129       first published in:
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131       De Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency es‐
132       timator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
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134       yinfft Yinfft algorithm
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136       This algorithm was derived from the YIN algorithm. In this  implementa‐
137       tion,  a  Fourier transform is used to compute a tapered square differ‐
138       ence function, which allows spectral weighting. Because the  difference
139       function is tapered, the selection of the period is simplified.
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141       Paul  Brossier,  Automatic  annotation of musical audio for interactive
142       systems, Chapter 3, Pitch Analysis, PhD thesis, Centre for Digital  mu‐
143       sic, Queen Mary University of London, London, UK, 2006.
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145       yinfast
146              YIN algorithm (accelerated)
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148       An  optimised  implementation  of  the  YIN algorithm, yielding results
149       identical to the original YIN algorithm, while  reducing  its  computa‐
150       tional cost from O(n^2) to O(n log(n)).
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SEE ALSO

153       aubioonset(1),  aubiotrack(1),  aubionotes(1),  aubioquiet(1),  aubiom‐
154       fcc(1), and aubiocut(1).
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AUTHOR

157       This manual page was written by Paul Brossier <piem@aubio.org>. Permis‐
158       sion  is  granted to copy, distribute and/or modify this document under
159       the terms of the GNU General Public License as published  by  the  Free
160       Software  Foundation,  either version 3 of the License, or (at your op‐
161       tion) any later version.
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165aubio 0.4.9                     19 January 2022                  AUBIOPITCH(1)
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