In acoustics, the pitch of a cello string is determined by the speed of its vibration, measured in Hertz (Hz). One Hertz represents one vibration cycle per second. The cello is a bass-clef instrument with a rich harmonic profile, and understanding these exact numbers is crucial for precise tuning and audio recording.
The following table represents the fundamental frequencies for the four open strings of a standard cello calibrated to the international tuning standard of A4 = 440 Hz.
| String | Scientific Pitch | Frequency (Hz) | Wavelength (Approx.) |
|---|---|---|---|
| 1st (Highest) | A3 | 220.00 Hz | 156.82 cm |
| 2nd | D3 | 146.83 Hz | 234.95 cm |
| 3rd | G2 | 98.00 Hz | 352.04 cm |
| 4th (Lowest) | C2 | 65.41 Hz | 527.44 cm |
While A=440Hz is the modern standard, many musicians and orchestras use different calibrations based on historical or aesthetic preferences:
The numbers above represent the fundamental frequency. However, when you bow a cello string, it also produces "overtones" or harmonics. For example, when you play the open A string (220 Hz), the string also vibrates at 440 Hz, 660 Hz, and so on. These harmonics are what give the cello its characteristic warm and complex timbre.
Human hearing can typically detect a change of about 5 cents (1/20th of a semitone). In the lower registers of the cello (like the C string), a difference of just 1 Hz is very noticeable. This is why CelloEasy utilizes high-resolution FFT (Fast Fourier Transform) algorithms to detect these micro-variations and ensure your instrument is perfectly aligned with the desired Hertz value.