The acoustic signal transmission means 101 may transmit, as the transmission acoustic signal, the music on which another acoustic signal (such as white noise) is superimposed, for the purpose of improving the amplitude of a low-amplitude component in the musical sound or for the purpose of compensating for a low-power component of the frequency components in the musical sound. Further, in the case where a service using an acoustic signal itself, such as music distribution, transceiver, or telephone, is provided, the acoustic signal transmission means 101 may transmit the acoustic signal used for the service, as the transmission acoustic signal.

FIGS. 12(a) and 12(b) are explanatory diagrams depicting an example of a transmission acoustic signal obtained by superimposing, on an acoustic signal of music, another acoustic signal for the purpose of improving the amplitude of a low-amplitude component in the musical sound. FIG. 12(a) depicts the voice signal of the original music, with the horizontal axis representing time and the vertical axis representing the signal value. FIG. 12(b) depicts the transmission acoustic signal obtained by adding white noise to the original music, with the horizontal axis representing time and the vertical axis representing the signal value. As depicted in FIGS. 12(a) and 12(b), the amplitude of the low-amplitude component is improved by adding white noise or the like to the original music. Here, the absolute value of the signal value corresponds to the amplitude.