medvedych/SailTuner
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
Chromatic tuner for SailfishOS with multi-temperament support
100 commits 1 branch 1 tag 2.8 MiB
C++ 52.8%
QML 43.2%
Makefile 2.3%
QMake 1.5%
Shell 0.2%
Find a file
Louis-Joseph Fournier 8c5036c201 Banniere and 3rd try icon
2016-01-16 20:26:26 +01:00
data Temperaments: sort and arrange letters cases 2016-01-15 09:30:53 +01:00
icons Banniere and 3rd try icon 2016-01-16 20:26:26 +01:00
images Banniere and 3rd try icon 2016-01-16 20:26:26 +01:00
qml Icons: second try 2016-01-16 19:56:25 +01:00
rpm Rpm: file permissions and icons 2016-01-15 23:18:33 +01:00
src Player: volume depend of frequency 2016-01-14 22:03:36 +01:00
.gitignore First commit for SailTuner 2015-12-26 20:46:02 +01:00
harbour-sailtuner.desktop Sailfish: build integration, display frequencie 2015-12-27 10:57:37 +01:00
harbour-sailtuner.pro Rpm: file permissions and icons 2016-01-15 23:18:33 +01:00
LICENSE Licence to GPLv3 and Readme file 2016-01-03 17:32:36 +01:00
README.md Licence to GPLv3 and Readme file 2016-01-03 17:32:36 +01:00
Tuner.pro Images reorganisation 2016-01-15 21:30:17 +01:00

README.md

SailTuner

SailTuner is a chromatic multi-temperament instrument tuner for Sailfish OS.

It gets audio data from microphone, find the fundamental frequency, and then display the note, the octave and the deviation according to note reference and temperament.

Pitch detection algorithm

The algorithm for fundamental frequency detection:

  • high-pass filter (10Hz)
  • zero-crossing detection with linear interpolation
  • pattern recognition from regions, with time based standart deviation
  • octave filtering: drop a frequency if already a higher octave for same note in some conditions
  • post filter: wait few analyses to confirm or defect a note, and make a turning average for note deviation

The audio input rate is 16KHz ; audio frames are analysed every 1024 samples (64ms) and a note is confirmed after 4 chunks (256ms).

The note is found compared to an array of frequencies modulo one octave. The comparison array is built from a temperament and a 'A4' reference, default to 440Hz and equal temperament.

======

Copyright

Licence: GPLv3
Author: Louis-Joseph Fournier
*First release date: 2016-??

https://github.com/LouJo/SailTuner