BS EN 62571:2011 Digital audiobook file format and player requirements

Coding (data conversion)
Data layout
Audio systems
Acoustic signals
Binary digits
Data transmission
Interfaces (data processing)
Digital recording methods
Data processing
Interfaces
Pulse-code modulation
Digital signals
Information exchange
Audio equipment

Link: BS EN 62571:2011 Digital audiobook file format and player requirements
Source: BSI Standards