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X50
Installation and Operation Manual
77
DTS Neural Surround Audio DownMix
Overview
The DTS Neural Surround DownMix enables 5.1 surround sound to be transported through
any stereo infrastructure. The DownMix process is based upon the principle that both
natural stereo and 5.1 content are two-dimensional; both contain width and depth spatial
attributes.
The DTS Neural Surround DownMix can represent six channels of discreet audio sources in a
stereo DownMix by transforming the sources into pure intensity and coherence encoding.
By correcting overlaps of the signal sources in intensity, time, coherence, polarity, and phase
before the six channels are combined, the DTS Neural Surround DownMix accounts for the
problems suffered in traditional matrix encode systems—such as comb filtering, spatial
location distortion, etc.
The proprietary DTS Neural Audio “watermark process” faithfully reproduces surround
information when it is rendered by the DTS Neural Surround UpMix or any LtRt system. In
brief, the DTS Neural Surround DownMix produces a stereo DownMix that accurately
represents the original content whether monitored in mono, stereo, matrix or DTS Neural
5.1 Surround Sound.
Figure 6 below shows a DownMix taking a multi-channel audio source. The DownMix
creates two-channel audio source using the DTS Neural Audio approach of embedding a
watermark signal within the stereo audio signal patch. The watermark signal contains
spatial and steering positioning information. The resulting stereo audio signal is also known
as LwRw.
Figure 6. DownMix Block Diagram
Table 4-5 DTS Neural Surround Audio DownMix Parameters
Parameter Name Function Options
DownMix Status Indicates the state of the AAP mode

Uninitialized

Running

Not Running
(bypassed)

Not Running
Channel Config Controls the input channel configuration

5.1

7.1
L/R Encoding Mode Specifies the encoding mode for the left and right channels

Phantom Center

Hard Center