Patent ID: 8878045

Claim:
An acoustic effect impartment apparatus for use in a piano that has a plurality of keys, a plurality of strings provided in corresponding relation to the keys, and a plurality of hammers each responsive to an operation of any one of the keys to strike the string corresponding to the key, the acoustic effect impartment apparatus comprising: a detection section configured to detect striking of any one of the strings by a corresponding one of the hammers; a signal generation section configured to generate, on the basis of a detection result of the detection section, at least one sine wave signal each consisting essentially of a simple waveform representing a frequency based on a fundamental frequency of the string struck by the hammer; a vibration section configured to generate vibration corresponding to the at least one sine wave signal generated by the signal generation section; and a vibration transmission structure configured to transmit the vibration, generated by the vibration section, to the strings.