As stated above, Dolby Atmos can be delivered by Dolby Digital Plus. This scenario is referred to using two different terms:

  • Dolby Digital Plus with Dolby Atmos
  • Dolby Digital Plus JOC (Joint Object Coding)

The second reference is a technical term that may be found in some Dolby documentation or papers. Joint Object Coding describes the process by which Dolby Digital Plus with Atmos decoders, receiving a legacy 5.1 mix and sideband metadata, are able to reconstruct the original Atmos mix.