Patent ID: 7853343

Claim:
An acoustic device which operates to receive an input of an audio signal contained information on an audio format and the number of audio channels and to set a reproduction mode for performing audio reproduction on the basis of the audio signal, the acoustic device comprising: storage means for storing setting information for reproduction mode including information on a type of multi-channel processing for a plurality of audio formats in such a way of being able to update the setting information for each of the audio formats; input reception means for receiving an input of the setting information for reproduction mode; update means for updating setting information for reproduction mode stored in the storage means in accordance with the setting information for reproduction mode received by the input reception means; audio information acquisition means for acquiring information on an audio format and the number of audio channels of an inputted audio signal from the inputted audio signal; decision means responsive to the information on the audio format of the audio signal acquired by the audio information acquisition means for reading setting information of a reproduction mode for a corresponding audio format out of the storage means to decide the number of channels obtained based on information on a type of multi-channel processing contained in the read setting information; and reproduction mode setting means for setting a mode of a multi-channel processing for converting the audio signal into multi-channel with the number of channels decided by the decision means if the number of audio channels of the audio signal acquired by the audio information acquisition means is less than the number of channels decided by the decision means.