HD DVD | Blu-ray Disc | DVD-Video | DVD-Audio | LaserDisc | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Codec | Player support | Channels (max) | Max bit rate | Player support | Channels (max) | Max bit rate | Player support | Channels (max) | Max bit rate | Player support | Channels (max) | Max bit rate | Player support | Channels (max) | Max bit rate |
Dolby Digital | Mandatory | 5.1 | 504 kbit/s | Mandatory | 5.1 | 640 kbit/s | Mandatory | 5.1 | 448 kbit/s | Optional in video zone for playback compatibility on DVD-Video players | 5.1 | 448 kbit/s | Optional | 5.1 | 384 kbit/s |
Dolby Digital Plus | 7.1 | 3 Mbit/s | Optional | 7.1 | 1.7 Mbit/s | ||||||||||
Dolby TrueHD | 7.1 | 18 Mbit/s | 7.1 | 18 Mbit/s |
Field Name | # of bits | Description |
---|---|---|
Syncword | 16 | 0x0B77, data transmission is left bit first: big endian |
Cyclic redundancy check | 16 | |
Sampling frequency | 2 | '11'=reserved '10'=32 kHz '01'=44.1 '00'=48 |
Frame size code | 6 | |
Bit stream identification | 5 | |
Bit stream mode | 3 | '000'=main audio service |
Audio coding mode | 3 | '010'=left, right channel ordering |
Center mix level | 2 | |
Surround mix level | 2 | |
Dolby Surround mode | 2 | '00'=not indicated '01'= Not surround encoded '10'= Yes, surround encoded |
Wikimedia Commons has media related to Dolby Digital. |