![]() ![]() ![]() DD+ already offers a much superior compression rate compared to Dolby Digital and can include Dolby Atmos metadata as well. So far, there aren’t many differences between Dolby AC4 and Dolby Digital Plus (or Dolby EAC3), another multichannel audio format developed by Dolby. The typical bit rate of a Dolby AC4 stream for Dolby Atmos 7.1.4 restitution is 288 Kbps.ĭolby AC4… compared to Dolby Digital Plus The Advanced Coupling technology can incorporate extra metadata (Dolby Atmos for example) and can support up to 12 channels. ![]() The typical bit rate for a Dolby AC4 5.1 channel is 192 Kbps, compared to the 384 to 640 Kbps needed for Dolby AC3 (Dolby Digital). The Advanced Joint Channel Coding is applied to the lowest bit rates and is limited to 5.1 streams. Interactive features for an improved listening experienceĭolby AC4 uses two different signal encoding technologies.Dolby AC4 is a multichannel lossy audio format and the follow-up to Dolby AC3, better known under the trade name Dolby Digital. ![]()
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