Patent ID: 8648240

Claim:
A computer-implemented method for tuning a string instrument, the method comprising: storing a reference standard pitch for a string of the string instrument; measuring a pitch generated by a string of the string instrument; determining an adjustment factor based on a comparison of the measured pitch and the stored standard pitch; storing the adjustment factor for the string; generating a continuous input signal based on measured vibrations of the string of the string instrument; generating, by a processor, an output signal for the string based on the input signal, the generating comprising: adjusting the input signal based on the stored adjustment factor for the string, identifying a closest reference note to a pitch of the adjusted input signal, if the pitch of the adjusted input signal is within an error threshold of the closest reference note, setting the adjusted input signal to have an output pitch equal to a pitch of the identified closest reference note, if the pitch of the adjusted input signal is outside the error threshold of the closest reference note, setting the adjusted input signal to have an output pitch equal to a function that is continuous and starts from the pitch of the identified closest reference note to a next reference note at a boundary of the error threshold, and outputting the adjusted input signal as the output signal for the string.