Sierra Video UPC-166 - Manual (Page 18)

1
UPC-166 Functional Description
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
MONO can in turn be routed and processed just like any of the other audio
sources described earlier.
Σ
Figure 1-6 Audio Mono Mix Functional Block Diagram with Example Sources
2.0-to-5.1 Upmix Function
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 Sierra Video
price lists as ―OPT-SW-UM‖) can be purchased upon
initial order, or field-activated using a key string which is sent to you when this
option is purchased.)
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 (
L ), Right ( R ), Center ( C ), Low Frequency Effects ( LFE ), Left
Surround ( Ls ), and Right Surround ( Rs )). Whenever the upmixer is active, it
overwrites the six selected channels with the new 5.1 upmix signals
(including replacing the original source stereo
L and R inputs with new L and
R signals).
Note:
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 C , LFE , Ls , and Rs , this
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 C , LFE , Ls , and Rs , this
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.
1-14 UPC-166-OM
(V4.0)
Emb Ch 1 - Ch 16
AES Ch 1 - Ch 16
AN-AUD Ch 1- Ch 8
Emb Ch 12 L
Emb Ch 16 R
O MON