Patent ID: 7451330

Claim:
A mobile device comprising: musical composition-reproducing circuitry that includes a first number of musical tone synthesis sections, each for reproducing one performing part assigned from among a second number of performing parts composing musical composition data, the first number being larger than the second number; a power supply that supplies power to said musical composition-reproducing circuitry; voltage level-monitoring circuitry that monitors a voltage level of the power supplied by said power supply; and assigning circuitry that duplicates a third number of performing parts in the second number of performing parts composing the musical composition data and assigns the second number of performing parts composing the musical composition data and the duplicated third number of performing parts to said musical tone synthesis sections of said musical composition-reproducing circuitry, respectively, the third number being equal to or less than the second number, when the voltage level monitored by said voltage level-monitoring circuitry becomes lower than a predetermined value, whereby the musical tone synthesis sections reproduce the second number of performing parts and the third number of performing parts.