Encoding apparatus of audio signal, audio disc and disc reproducing apparatus

An audio disc reproducing apparatus for reproducing data recorded in an audio disc, the audio disc having a data structure comprising:

• a video title set (VTS<1>) including video objects (VOBS) and audio data of the video objects;
• a first managing area (VMG) including information (VMGI) for managing the video title set (VTS<1>);
• a first audio title set (ATS<1>) including reference information for access to audio data of the video objects (VOBS) in the video title set (VTS<1>) and having a second audio title set (ATS<2>) including audio data (ACBS) including a multi-channel audio signal, where the audio data have a down-mix mode information for assigning whether or not inhibiting down-mix stereo output from the multi-channel audio signal;
• and
• a second managing area (AMG) including information (AMGI) kg managing the first and second audio title sets and managing the audio data of the video objects in the video title set;
• wherein said audio disc reproducing apparatus comprises:
• reproducing means for reproducing the audio data (ACBS) of the second audio title set existing in the second audio title set (ATS<2>) by using the information of the second managing area;
• decoding means for decoding the down-mix mode information for assigning whether or not inhibiting down-mix stereo output from the multi-channel audio signal;
• and
• down-mixing permitting means for permitting down-mixed stereo output from the multi-channel audio signal when said decoded down-mix mode information is not inhibiting down-mix stereo output from the multi-channel audio signal.