3/6/2024 0 Comments Piano tuning fork frequencyHammond organs are not stretch tuned at all. And that is what they call stretching.Ī Fender Rhodes tine assembly has a very different harmonic structure from a string, and I don't think they are stretched. So when you tune the higher octave to be in tune with that first harmonic of the lower octave, you tune it a little higher than twice the frequency of the lower octave. The first harmonic is a little higher than twice the frequency of the fundamental. This is called "inharmonicity" and it is most evident in the high strings on a piano which are short and stubby. A real string has harmonics that are not exactly 2,3,4,5,6 etc times the fundamental frequency. And of course there are no ideal strings. If one string were a little out of tune, for example 221 instead of 220, you would hear a beat once per second, and that is not as pretty as no beats at all.īut this applies only to ideal strings. If you play a different A an octave higher at the same time, the combination sounds nice, like an octave should, because you hear the higher string's fundamental an octave higher at 220 Hz, and that reinforces the 220 Hz first harmonic of the low A string. You can change just how loud each harmonic is by picking closer to the bridge for example, and you can hear that as a different timbre. You know how to sound a harmonic by touching a node as you pick, but in fact those harmonics are all there every time you pick or strike a string. For example the A string on a standard guitar has a fundamental frequncy of 110 Hz. Why the octaves need to be stretched at the high and low ends of the keyboardĪn ideal string can vibrate at many different frequencies, called harmoonics, and they are all multiples of a fundamantal frequency.
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