Cobalt Digital COMPASS 9381 HD_SD-SDI Timecode Inserter - Manual (Page 14)

1
9381 Functional Description
1-10 9381 PRODUCT MANUAL 9381-OM (V4.3)
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.
The examples in Figure 1-5 show the automatic enable/disable up-mixing
function applied to example selected channels
Emb Ch 1 thru Emb Ch 6 . As
shown and described, the processing is contingent upon the signal levels of
the channels selected to carry the new 5.1 upmix relative to the selected
threshold (in this example, -60 dBFS). Note also that this function is applied
after the Audio Routing/Gain Control function.
Loudness Processor (Option +LP)
Note: Loudness processor function is an optional licensable feature. This function
and its controls appear only when a license key is entered and activated.
(This option (identified in Cobalt
® price lists as +LP) can be purchased upon
initial order, or field-activated using a key string which is sent to you when this
option is purchased.)
If your card was purchased with option +LP , loudness processor manual
supplement “5.1 and Stereo Loudness Processing Options for Compass ®
Cards (+LP51, +LP20) Manual Supplement” (OPT-SW-LP-MS) is included
in your documentation package. Supplement OPT-SW-LP-MS can be
downloaded from our website or requested using the Cobalt contact
information in this manual.