Cobalt Digital Inc 9061 Product Manual page 19

Introduction
Figure 1-6 Audio Mono Mix Functional Block Diagram with Example Sources
9061-OM (V4.9)
The Mono Mixer function (Figure 1-6) generates an additional mono-mixed
channel from two selected embedded, AES discrete, or analog input channels
serving as left and right inputs. The resulting mono mix channel
turn be routed and processed just like any of the other audio sources described
earlier.
Emb Ch 1 - Ch 16
AES Ch 1 - Ch 16
AN-AUD Ch 1- Ch 8
Emb Ch 12
Emb Ch 16
2.0-to-5.1 Upmix Function
Note: Upmix function is an optional licensable feature. This function and its controls
appear only when a license key is entered and activated. (This option (identi-
®
fied in Cobalt price lists as +UM) can be purchased upon initial order, or
field-activated using a key string which is sent to you when this option is pur-
chased.)
The 2.0-to-5.1 upmixer function receives a normal PCM stereo pair from the
Audio Routing/Gain Control function and upmixes the pair to provide 5.1
channels (Left (
Surround ( ), and Right Surround (
Ls
overwrites the six selected channels with the new 5.1 upmix signals
(including replacing the original source stereo
signals).
R
The 2.0-to-5.1 upmixer can be set to up mix in any of three modes: Always
upmix, Bypass upmix, or Auto enable/bypass upmixing. The Auto upmixing
mode looks at the signal levels on the selected channels and compares them to
a selectable level threshold. It then determines whether or not to generate 5.1
upmixing from the stereo pair as follows:
If the upmixer detects signal level below a selected threshold on all
•
four of the selected channels designated as
indicates to the upmixer that these channels are not carrying 5.1. In
this case, the upmixer overwrites all six selected channels with the
new 5.1 content.
If the upmixer detects signal level above a selected threshold on any
•
of the four selected channels designated as
indicates to the upmixer that the channel(s) are already carrying
viable 5.1 content. In this case, the upmixer is bypassed, allowing the
original channels to pass unaffected.
9061 PRODUCT MANUAL
L MONO
Σ
R
), Right ( ), Center ( ), Low Frequency Effects (
L R C
)). Whenever the upmixer is active, it
Rs
9061 Functional Description
MONO
), Left
LFE
and inputs with new
L R
, , , and , this
C LFE Ls Rs
, , , and , this
C LFE Ls Rs
can in
and
L
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