NAME

       aubiopitch - a command line tool to extract musical pitch

SYNOPSIS

       aubiopitch source
       aubiopitch [[-i] source] [-o sink]
                  [-r rate] [-B win] [-H hop]
                  [-p method] [-u unit] [-l thres]
                  [-T time-format]
                  [-s sil] [-f]
                  [-v] [-h] [-j]

DESCRIPTION

       aubiopitch attempts to detect the pitch, the perceived height of a musical note.

       When  started  with an input source (-i/--input), the detected pitch are printed on the console, prefixed
       by a timestamp in seconds. If no pitch candidate is found, the output is 0.

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

OPTIONS

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

       -i, --input source
              Run analysis on this audio file. Most uncompressed and compressed 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. The detected
              frequency is played at the detected loudness.

       -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 2048.

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

       -p, --pitch method
              The pitch detection method to use. See PITCH METHODS below. Defaults to 'default'.

       -u, --pitch-unit unit
              The unit to be used to print frequencies.  Possible  values  include  midi,  bin,  cent,  and  Hz.
              Defaults to 'Hz'.

       -l, --pitch-tolerance thres
              Set  the  tolerance  for  the pitch detection algorithm. Typical values range between 0.2 and 0.9.
              Pitch candidates found with a confidence less than this threshold will not be selected. The higher
              the threshold, the more confidence in the candidates. Defaults to unset.

       -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.
              Defaults 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 controller to feed aubio some signal and
              listen to its output.

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

       -v, --verbose
              Be verbose.

PITCH METHODS

       Available methods are:

       default
              use the default method

       Currently, the default method is set to yinfft.

       schmitt
              Schmitt trigger

       This pitch extraction method implements a Schmitt trigger to estimate the  period  of  a  signal.  It  is
       computationally very inexpensive, but also very sensitive to noise.

       fcomb  a fast harmonic comb filter

       This  pitch  extraction  method  implements  a  fast  harmonic  comb  filter to determine the fundamental
       frequency of a harmonic sound.

       mcomb  multiple-comb filter

       This fundamental frequency estimation algorithm implements spectral flattening, multi-comb filtering  and
       peak histogramming.

       specacf
              Spectral auto-correlation function

       yin    YIN algorithm

       This algorithm was developed by A. de Cheveigne and H. Kawahara and was first published in:

       De  Cheveigné,  A., Kawahara, H. (2002) "YIN, a fundamental frequency estimator for speech and music", J.
       Acoust. Soc. Am. 111, 1917-1930.

       yinfft Yinfft algorithm

       This algorithm was derived from the YIN algorithm. In this implementation, a Fourier transform is used to
       compute  a  tapered  square  difference function, which allows spectral weighting. Because the difference
       function is tapered, the selection of the period is simplified.

       Paul Brossier, Automatic annotation of musical audio for interactive systems, Chapter 3, Pitch  Analysis,
       PhD thesis, Centre for Digital music, Queen Mary University of London, London, UK, 2006.

       yinfast
              YIN algorithm (accelerated)

       An  optimised  implementation  of  the  YIN  algorithm,  yielding  results  identical to the original YIN
       algorithm, while reducing its computational cost from O(n^2) to O(n log(n)).

SEE ALSO

       aubioonset(1), aubiotrack(1), aubionotes(1), aubioquiet(1), aubiomfcc(1), and aubiocut(1).

AUTHOR

       This manual page was written by Paul Brossier <piem@aubio.org>. Permission 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 option) any later version.