- Thread Starter
- #21
We need such tests. If only the measuring equipment can pick up such small differences in frequencies, but I also see the following problem in a slow sweep method. When a piano key is hit, it sounds always distorted initially, then individual strings tend to synchronise over a short period of time due to the interactions. This is a synchronising phase process, but in result frequency is also being shifted close together. It is only valid when piano is tuned properly. We can't meassure it with a slow sweep, but we can start with a delay, as we are interested in a slow decay part. Or we can generate a steady signal in lab by mixing in high resolution three wave sources.But that won't affect fundamental frequencies to change. It merely has to do with the amplitude of its harmonics.
It also isn't a 'step' thing either which one would expect when one makes the claim that 3 strings in a pinao which are individually tuned to have a certain relation to create a 'note' would change the frequency.
This can easily be tested by sweeping or slowly wobbling a second frequency slowly around a fixed frequency.
When piano is detuned this effect do not show. It sounds in dissonance from the beginning to the end. The same happens when sound comes out from D30. Maybe that can be meassured, as is quite steady.