Virtual tuning of a string instrument
In an un-tuned state, the strings of a string instrument are excited, and a standard adjustment factor is determined for each string. When a pitch is generated as a result of a string being strummed (e.g., during normal playing of the instrument), the pitch generated by the string is adjusted by the standard adjustment factor and an intonation adjustment factor that accounts for intonation errors. An adjusted pitch is output that is in-tune and has accurate intonation.
1. 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.
2. The method of claim 1 , wherein the adjustment factor is determined responsive to a calibration command received from a user input.
3. The method of claim 1 , further comprising:
receiving a user input to configure the error threshold for the string.
4. A method for tuning a string instrument having a plurality of strings, the method comprising performing the method of claim 1 for each of the plurality of strings.
5. A computer-implemented method for tuning a string instrument, the method comprising:
generating a continuous input signal based on measured vibrations of the string of the string instrument;
identifying a closest reference note to a pitch of the input signal;
if the pitch of the measured input signal is within an error threshold of the closest reference note, setting the input signal to have an output pitch equal to a pitch of the identified closest reference note;
if the pitch of the measured input signal is outside the error threshold of the closest reference note, setting the 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 input signal as an output signal for the string.
6. The method of claim 5 , further comprising:
receiving a user input to configure the error threshold for the string.
7. A method for tuning a string instrument having a plurality of strings, the method comprising performing the method of claim 5 for each of the plurality of strings.
8. A tuning system for a string instrument, the tuning system comprising:
a transducer configured to generate a continuous input signal based on measured vibrations of a string of the string instrument;
a processor configured to generate an output signal for the string based on the input signal by:
identifying a closest reference note to a pitch of the input signal,
if the pitch of the measured input signal is within an error threshold of the closest reference note, setting the 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 input signal as an output signal for the string.
9. The tuning system of claim 8 , the tuning system further comprising:
a memory storing a reference standard pitch for the string of the string instrument;
wherein the processor is further configured to perform standard tuning of the string by:
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, and
adjusting the input signal based on the stored adjustment factor for the string.
10. The tuning system of claim 8 , wherein the processor is configured to perform standard tuning of the string responsive to a calibration command received from a user input.
11. The tuning system of claim 8 , wherein the processor is further configured to receive a user input to configure the error threshold for the string.