Dolby E

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Dolby E logo.

Dolby E is a lossy audio compression and decoding technology developed by Dolby Laboratories that allows 6 to 8 channels of audio to be compressed into an AES3 digital audio stream that can be stored as a standard stereo pair of digital audio tracks.

Up to six channels, such as a 5.1 mix, can be recorded as 16-bit Dolby E data. However, if more than six channels are required, such as 5.1 plus a stereo LtRt, the AES3 data must be formatted as 20-bit audio. This increases capacity to eight channels.

Dolby E should never reach home viewers, as it is intended for use during post-production when moving multichannel material between production facilities or broadcasters. It is decoded prior to transmission.

It is very important to ensure that a Dolby E stream is never played through monitors or headphones without decoding. Undecoded Dolby E data will be converted to analog as full scale (0 dBFS) digital noise that can easily damage loudspeakers or hearing. Unambiguous media labeling is essential to avoid this.

Products[]

Dolby E encoding and decoding is implemented using commercially available hardware or software.

Hardware[]

  • Dolby DP571
  • Dolby DP572
  • Dolby DP568
  • Dolby DP580
  • Dolby DP591
  • Dolby DP600
  • Dolby DP600C

Software[]

  • FFmpeg, since version 4.4 released on April 8th, 2021[1] such streams can be seeked, still no full support for SMPTE ST 307 non-pcm mode
  • Emotion Systems 'eNGINE'[2]
  • Minnetonka Audio 'AudioTools Server'[3]
  • Minnetonka Audio SurCode for Dolby E[3]
  • Neyrinck SoundCode For Dolby E

References[]

  1. ^ "FFmpeg". www.ffmpeg.org. Retrieved 9 April 2021.
  2. ^ Dolby Encode and Decode using The eNGINE
  3. ^ a b "Minnetonka Audio". www.telosalliance.com.

External links[]

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