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Dec 15, 2008, 04:08 AM
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Blog graveyard


Now that Rain Ramon is back to 24/7 rain, we got only some captive tests using the nacelle angles to stabilize yaw.

It's time to exume something from the blog graveyard. Today's blog grave is electric pianos #2.

In a real piano, the acceleration & terminal velocity of the key determines the loudness & tone quality. Those computer scientist musicians in Japan don't think about acceleration much. Acceleration is the rate at which the key goes from 0m/s to the terminal velocity. The faster the key goes from 0m/s to terminal velocity, the brighter & drier the sound. Lower acceleration produces mellow, wetter sounds.

Electronic pianos only convert total velocity to loudness. They detect the start & end times of key travel through a reed switch & that's it. Acceleration would require knowing the instantaneous position of each key, huge amounts of bandwidth, so it's never been done.

The electric piano hack is coming down to 3 options:

Completely remove the strip of reed switches & replace it with a strip of optical bounce sensors using tubes for isolation.

Drill holes under each key's weight & install optical bounce sensors.

Install an optical bounce sensor above each key & a small mirror on each key. Sense angular movement by the horizontal travel of the LED's reflection.
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