xenial (1) zita-retune.1.gz

NAME

       zita-retune - resample an audio file in order to change its pitch

SYNOPSIS

       zita-retune <options> <input file> <output file>.

DESCRIPTION

       zita-retune  resamples   an  audio  file by a the inverse of a ratio expressed in cents, without changing
       the nominal sample rate.

       The result is to change the musical pitch and length of the file. Input can be any audio file readable by
       the libsndfile library. The output file type is either WAV or CAF.

OPTIONS

       --help Display a short help text.

       --cent pitch change in cents
              The  number  of  cents  by  which  the pitch is changed. The accepted range is +/- 1200 cents, the
              useful range in practice will be something like +/- 100 cents.

   Output file type
       --wav  Produce a WAV file, or for more than 2 channels, a WAVEX file.  This is the default.

       --amb  Produce a WAVEX file with the Ambisonic GUID. Such files should have the .amb filename extension.

       --caf  Produce a Core Audio file.

   Output sample format
       --16bit
              Output sample format is signed 16-bit. This option also enables the use  of  dithering,  described
              below.

       --24bit
              Output sample format is 24-bit. This is the default.

       --float
              Output sample format is 32-bit floating point.

   Dithering
       --rec  Add  white  dithering noise with a rectangular distribution. This is the best option if the output
              data is going to processed again, but in that case it would be advisable to use 24-bit or float.

       --tri  Add filtered noise with a triangular distribution. Compared to the rectangular dither this reduces
              the noise density in the lower frequency range.

       --lips This uses the optimal error feedback filter described by Stanley Lipschitz. This is recommended is
              the output is the final distribution format, e.g. for a CD.

   Timing
       --pad  Insert zero valued input samples at the start and  end  so  that  the  output  includes  the  full
              symmetric filter response even for the first and last samples.

EXIT STATUS

       Zero in case there are no errors, non-zero otherwise.

SEE ALSO

       Some examples of dithering are available here: http://www.kokkinizita.net/linuxaudio/dithering.html

AUTHOR

       zita-retune was written by Fons Adriaensen <fons@kokkinizita.net>.

       This  manual  page was written by Jaromír Mikeš <mira.mikes@seznam.cz> for the Debian project (but may be
       used by others).

                                                 September 2012                                   ZITA-RETUNE(1)