Technical specifications, Up-mix module – Grass Valley Imagestore 750 v.3.0.1 User Manual
Page 151
135
Imagestore 750
User Manual
Technical Specifications
An Imagestore 750 that is equipped with an up-mix kit has a carrier card containing 4 slots avail-
able for either up-mix or Dolby modules. There are no specific slots for up-mix modules because
the Imagestore 750 detects the modules’ presence and type automatically.
Up-Mix Module
The part number is MOD-LA-DUP701.
The up-mix audio module supports Linear Acoustic’s upMAX
TM
5.1-channel surround-field
synthesizer under license. It creates “down-mix-compatible” left, right, center, surround and LFE
channels from a two-channel audio input.
You can place each up-mix module in one of 4 modes:
•
Pass-through.
In pass-through mode, six input channels are passed through the module unaltered:
Fig. 6-19: Up-Mix module, pass-through mode
•
Up-mix.
In this mode, the module synthesizes a multi-channel audio signal from a stereo audio input.
Fig. 6-20: Up-Mix module, Stereo Up-Mix mode
•
From metadata.
In this mode, the control of up-mixing or passthrough is steered by metadata. This allows
automated stereo/surround switching between inputs when the input source contains
same-source audio transitions.
Fig. 6-21: Up-Mix module, From Metadata mode
•
AutoMAX.
TM
‘AutoMAX
TM
’ mode will automatically switch between stereo and 5.1 at its input to provide
5.1 output at all times. It will automatically decide whether to up-mix.
4, 5
This ensures a fully
automatic delivery of 5.1 audio to the consumer.
Up-Mix
6 Audio Channels
Up-Mix
5.1
Stereo
Up-Mix
5.1 Audio
5.1 Audio
or Stereo
Metadata
4. Current up-mix modules use Linear Acoustics’ AutoMax-II
TM
algorithm.
5. Earlier up-mix modules used an earlier Linear Acoustics’ AutoMax-I
TM
algorithm. When up-mix was en-
abled, the input channels 1 and 2 (L/R) were always up-mixed onto outputs 1–6 (L/R/C/LFE/Ls/Rs). If in-
put channels 3–6 were also present then these signals were mixed onto the up-mixed C/LFE/Ls/Rs
outputs. In summary, there was no dynamic signal detection between 5.1 and stereo inputs.