Format
Dolby Digital AC-3
Summary
- Name
- Dolby Digital AC-3
- Identifiers
-
- MIME: audio/ac3
- PUID: fmt/735
- Format type
- Audio
- Description
- AC-3 (backronymed to Audio Codec 3 or Advanced Codec 3) is the common version of Dolby Laboratories' Dolby Digital audio compression technology.
- File extensions
-
ac3 - Submitted by
- Digital Preservation Department / The National Archives
Internal signatures
Dolby Digital AC-3
- Description
- The file consists of repeated frames of audio data. Each frame begins with the 0x0B77 syncword. The size of the frame is determined by the nominal bit rate and sample rate as per Table 5.18 of the Digital Audio Compression Standard specification http://www.atsc.org/cms/standards/a_52-2010.pdf
- Provenance
- http://www.atsc.org/cms/standards/a_52-2010.pdf
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- 0
- Byte Sequence
0B77- Endianness
- None