Application intended to tune guitar and ukulélé. Il suffit de gratter la corde près de l’IPhone et de positionner la LED sur le vert.

    Two ways to tune:

        - Either use the ‘auto-detection’.

        - Or select the desired string to tune, if the ‘auto-detection’ doesn’t work correctly.

       

    Following sound acquisition, an Hamming window and a FFT (Fast Fourier transform) are applied to signal. FFT returns  note’s frequency which is compared to desired note’s frequency.

1 - Guitar Tuner :

    Tune:  E, A, D, G, B, E   440Hz.

    Note Frequencies:

            String 6 : E (mi)  ................... 83 Hz

            String 5 : A (la)  ................... 110 Hz

            String 4 : D (ré)  ................... 147 Hz

            String 3 : G (sol) ................... 196 Hz

            String 2 : B  (si)   ................... 247 Hz

            String 1 : E  (mi)  ................... 330 Hz

2 - Ukulélé Tuner:

    Tune: G, C, E, A.

    Fréquence des notes :

            String 4 : G (sol)  ................... 784 Hz

            String 3 : C (do)  ................... 523 Hz

            String 2 : E (mi)   ................... 659 Hz

            String 1 : A (la)   ................... 440 Hz