Audio signal output device, audio system, and audio signal output method

An audio signal output device comprising:

• an audio signal acquisition unit configured to acquire audio signals of a plurality of channels;
• a first electronic controller including
• a quantization bit expansion unit configured to expand the number of quantization bits of each of the audio signals to generate an expansion region for each of the audio signals, such that each of the plurality of channels has the expansion region and a region in which a corresponding audio signal of the audio signals is stored,
• an audio signal processing unit configured to generate a downmixed output signal in which the plurality of channels are downmixed such that an audio signal of at least one channel from among the plurality of channels is arranged at a reference bit position that is a position for identifying the at least one channel and is different from a reference bit position for an audio signal of a different channel of the plurality of channels, and such that the reference bit position for the audio signal of the at least one channel is positioned within the expansion region of the at least one channel, the reference bit position for the audio signal of the different channel being a position for identifying the different channel;
• and
• an output interface configured to output an output signal based on the downmixed output signal.