Patent ID: 7745719

Claim:
An electronic keyboard musical instrument comprising: a sound board made of a vibratable plate member; a frame substantially following a periphery of the sound board, wherein the sound board is attached to the frame; a plurality of key operators; at least one pedal operator; a first performance signal generator for generating a first performance signal based on an operating state of the plurality of key operators; a second performance signal generator for generating a second performance signal, which is different from the first performance signal, based on operation of the plurality of key operators and operation of the pedal operators; at least one speaker for generating musical tones based on the first performance signal generated by the first performance signal generator; and at least one vibrating device mounted to the sound board for vibrating the sound board based on the second performance signal generated by the second performance signal generator, wherein the sound board is free of any speaker being mounted thereon, and wherein when the at least one speaker is driven to sound musical tones, the at least one vibrating device is also driven to vibrate the sound board.