Dolby reintroduced the "Dolby Surround" terminology in 2014 to refer to something entirely new. The term now refers to a new upmixer whose "... purpose is to enable Atmos receivers and speaker configurations to serve non-Atmos signals." "Dolby Surround" is a complete replacement for Pro Logic that upmixes stereo and multi-channel inputs to play over Atmos configurations. It is:"...part of the Dolby Atmos bundle of technologies. It is an upmixer designed to function with traditional channel-based layouts, as well as Atmos enabled layouts that include overhead or Atmos-enabled speakers. It processes native stereo, 5.1, and 7.1 content.