Automatic player piano and estimator for acceleration of depressed key incorporated in the automatic player piano

摘要

An automatic player piano controls keys to be rotated by solenoid- operated actuator units in such a manner as to pass a reference point on a trajectory of the key at a reference velocity in a playback mode, and a hammer driven by the depressed key strikes strings at the same intensity as that in a recording mode, because the intensity is variable with the reference velocity at the reference point.