Now back to this question. A reed is driven by the air a player blows.
The frequency depends on the driving force. When you are trying the high
register, the way you blow triggers the higher mode of the reed. The 1st mode
is not triggered. But the pipe still can pick up low-frequency sub-modes
which happen to be the pipe's resonance.
Again, it's my guessing. I always think the frequency of the vibraiton
source is somehow also triggered by the pipe's resonances....
CHCheng
※ 引述《hschen (H-Y)》之銘言：
: ※ 引述《jay (傑哥)》之銘言：
: : According to last post, the vibration mode of the tip is
: : left up when right down, that seems not the 1st mode.
: : Well, it's not the point, I am just curious how they know that.
: : I thought the reed vibrate uniformly, never thought about that it can vibrate
: : that way.
: : Thank you for the references, this can be a good topic to research.
: A Jay,
: I agree with you completely. I don't know how to explain that.
: The description of the vibration of the reeds comes from a series
: of experiments conducted by James Pyne of the Ohio State Univ.
: I am not able to give a theoretical explanation of those experiments.
: Perhaps I should email him and ask him. Actually Tony Pay
: may know a little bit about this because he is also a quite
: knowlegable mathematician.
: Hsuan-Yi Chen
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