Abstract: A virtual reproduction signal generation unit generates a virtual reproduction signal based on a sound pickup signal of a stereophonic sound at a listening position in a compartment, assuming that virtual speakers are respectively located at portions of Np positions in a vehicle, the virtual reproduction signal causing the virtual speakers of the Np positions to reproduce the stereophonic sound. A virtual prediction signal generation unit generates a virtual prediction signal based on the virtual reproduction signal and an information representing a change of acoustic characteristics when at least part of the portions of the Np positions is changed, the virtual prediction signal causing the virtual speakers of the Np positions to output a predicted sound at the listening position. An output signal generation unit generates an output signal based on the virtual prediction signal, the output signal causing speakers of a plurality of positions to output the predicted sound.

Abstract: A virtual reproduction signal generation unit generates a virtual reproduction signal based on a sound pickup signal of a stereophonic sound at a listening position in a compartment, assuming that virtual speakers are respectively located at portions of Np positions in a vehicle, the virtual reproduction signal causing the virtual speakers of the Np positions to reproduce the stereophonic sound. A virtual prediction signal generation unit generates a virtual prediction signal based on the virtual reproduction signal and an information representing a change of acoustic characteristics when at least part of the portions of the Np positions is changed, the virtual prediction signal causing the virtual speakers of the Np positions to output a predicted sound at the listening position. An output signal generation unit generates an output signal based on the virtual prediction signal, the output signal causing speakers of a plurality of positions to output the predicted sound.