NAME

       sonic - Speech speed manipulator

SYNOPSIS

       sonic [OPTION]... inFile outFile

DESCRIPTION

       Sonic  is used to make wav files of speech faster or slower.  The primary advance in sonic
       is the ability to speed speech up by much more than 2X, with minimal distortion.  However,
       sonic can be used for both speeding up and slowing down speech files.  Additionally, sonic
       can change the pitch and volume.

OPTIONS

       -c     Modify pitch by emulating vocal chords vibrating faster  or  slower.   This  causes
              more  distortion  than  the  default  pitch  scaling, but sounds more like the same
              person trying to talk higher or lower.  The default pitch changes makes  the  voice
              sound like a larger or smaller person, but introduces little distortion.

       -p pitch
              Set pitch scaling factor.  1.3 means 30%% higher.

       -q     Disable  all speed-up heuristics, possibly improving the quality slightly.  This is
              mainly used for debugging the speed-up heuristics.

       -r rate
              Adjust the speed of playback.  This sales both the pitch and speed equally.

       -s speed
              Set speed up factor.  1.0 means no change, 2.0 means 2X faster.

       -v scaleFactor
              Scale volume by scaleFactor.  1.5 increases by 50%.  Clips if the maximum range  is
              exceeded.

EXAMPLES

       sonic -s 3.2 book.wav book_fast.wav

       The above command would increase the speed of an audio book called book.wav by a factor of
       3.2, and write the result in book_fast.wav.

       sonic -s 0.5 -v 1.5 spanish.wav spanish_slow.wav

       This would slow down the file spanish.wav by a factor of 2, make the  volume  50%  louder,
       and write the result to spanish_slow.wav.

       sonic -p 2.0 low.wav high.wav

       This would make a low voice sound very high pitched.

AUTHOR

       Bill Cox waywardgeek@gmail.com  Sonic Version 0.1, Copyright 2010, Bill Cox, GPL license

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