Abstract: An amplification circuit according to the present embodiment includes a first amplifier, a second amplifier, a capacitor, and an adjustment circuit. The first amplifier amplifies an input signal and outputs a first amplified signal. The second amplifier amplifies the first amplified signal input from the first amplifier through a connection line and outputs a second amplified signal. The capacitor is arranged between the connection line and an output line through which the second amplifier outputs the second amplified signal. The adjustment circuit changes a charge/discharge state of the capacitor according to a value of the input signal.

Abstract: A game machine audio device is provided which can obtain sounds to which a sense of distance in virtual game space has been imparted, while hardly altering the sound volume. Frequency components in sounds generated are altered according to distances in virtual game space between the sound emission position and the listening position.