Specifications

5.1-Channel Production Guidelines Production Techniques
5-8
If the possibility of delivering the original Lt/Rt exists, this is the preferred method. If
it is not possible, then mix compromises may be necessary to compensate for
unwanted artifacts caused by the downmix process.
5.3.5 Downmix-Stereo Compatibility
Even with the popularity of Dolby Digital and Dolby Surround systems, there will
always be a need to address stereo reproduction. There are three basic ways to
accomplish this.
Prepare a new stereo mix from the original multitrack elements.
Prepare a studio-adjusted downmix from the multichannel mix.
Let the decoder derive a stereo downmix.
Created from Multitrack Elements
This option is no different from today's conventional stereo mixing sessions. The stereo
mix is carried as PCM or as a separate two-channel Dolby Digital bitstream.
Created from a Multichannel Mix
The second option takes advantage of all the work that has gone into the mixing of
the 5.1-channel version, and allows the mixing engineer to quickly derive a stereo