Patent ID: 8022284
Filing Date: 2011-09-20
Classification: G10H

Abstract:
1. An apparatus for the just intonation tuning of an electrical piano in real time comprising: a sound generation system that generates all the sound signals predetermined to be associated with each of the keys of the electrical piano, when the keys are pressed; one PLC that monitors the keys being pressed, and that is programmed to determine which sound signal from all the generated sound signals for each key being pressed is allowed to travel to the electrical piano's speakers so that the sounds played by the speakers at any time are in just intonation; a plurality of relays controlled by the said PLC and mounted in the path between said sound generation system and said speakers, whereby, closed relays physically permit the traveling of the sound signals to the speakers; and, parallel connections between the piano's octaves and the PLC's inputs, and, between the PLC's outputs and said relays, whereby, real time tuning of the entire piano using only one PLC is achieved.