gtkguitune - KGuitune

       This  manual  page  was written by Antonín Král <A.Kral@sh.cvut.cz>, for the Debian GNU/Linux system (but
       may be used by others).

                                               September 06, 2003                                       WMKBD(1)

       This  manual  page documents briefly the gtkguitune program.  This manual page was written for the Debian
       GNU/Linux distribution because the original program does not have a manual page.

       Guitune is a linux program for tuning guitars and other instruments  by  using  the  method  of  Schmitt-
       triggering,  i.e.  counting  the  number of triggerings between two trigger levels in a certain amount of
       time.

       With FFT you need many samples to archieve the accuracy needed for  tuning  instruments.  You  often  get
       times  of  around  1  second  between  two  measurements  and  the  computer is quite busy in this second
       calculating the FFT. Using Schmitt-triggering you get a measurement every 10th of a second or  even  less
       (depending on the sample frequency you use). Most of the time the computer only waits for the samples.

       The  Trigger levels are adjustable. For a pure sine-wave the trigger levels could be zero. But for a wave
       wth overtones like the one in the figure above you need a non-zero triggerlevel. It is preadjusted  to  a
       level of 60% of the current maximum which should be able to deal with most instruments.

       gtkguitune - KGuitune

http://www.geocities.com/harpin_floh/kguitune_page.html
              Project web page.

gtkguitune