Package details
QPitch is a program to tune a musical instrument using your
computer and its microphone or line-in input. It is designed
to be completely cross-platform and works on Linux, Mac and
Windows platforms.
QPitch 1.0 is an offspring of K3Guitune 1.0. The layout of the
GUI and the pitch detection algorithm are quite similar to the
original ones, however the application has been rewritten almost
from scratch to take advantage of the new features of Qt4 and
to use the cross-platform PortAudio library. The FFT is
performed using the FFTW library.
The pitch detection algorithm is based on finding the first peak
in the autocorrelation of the input signal. The method is quite
reliable (even if a peak may also occur at sub-harmonics or
harmonics leading to an erroneous pitch detection). The
fundamental frequency used as a reference for pitch detection
can be configured according to the user preferences.
The estimated pitch is displayed on a note scale graphic, while
the input signal and the autocorrelation function are displayed
using an oscilloscope-like plot.
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