Sierra Video UDC-161 - Manual (Page 20)

UDC-161 Owner’s Manual
• (V 2.2)
Page 20 of 36
Embedded Group Enable
Enables or disables the embedding of a particular embedded audio group. Disabling a group preserves
the settings of the channels belonging to that group.
Output Source
Because the cards audio system functions like a router, each output can be sourced from any input
channel. This parameter lets you choose from the many different sources. Here is an explanation of the
different source names:
Source Name Description
EmXX Input embedded audio channel XX (1 through 16)
AeXX Discrete AES channel XX (1 through 16)
AnX Analog Audio channel X (1 through 8)
TgX Test Generator channel X (1 through 4)
DbX Dolby Decoded channel X (1 through 8)
DmX Dolby Mixdown channel X (1 through 2)
Output Gain
The gain of each output is adjustable from +30 dB to –100 dB in 0.1 dB steps. After –100 dB gain is
set to –Inf, which means that output is present, but muted.
Output Polarity
If set to “Norm” output polarity is the same as input polarity, if set to “Inv” the output polarity is
inverted. This can be used to correct polarity errors in the input signals fed to the card.
AES Sample Rate Converter Bypass
This turns off the built in sample rate converters that are enabled by default. The SRC’s allow the card
to interface with asynchronous AES sources (sources who’s AES timing does not match the video
reference timing.). This is a necessity when trying to embed non-PCM AES audio such a Dolby E or
Dolby Digital audio streams.
Zero-Delay Audio Embedding
Sometimes it is desirable to embed AES with minimum latency. For example, if you want to embed
Dolby E audio into video with no latency, and delay the video by one frame to account for Dolby E
encoding delay. By turning this control on for a given AES pair, the pair will be directly embedded
into it’s corresponding group, bypassing the normal frame sync audio delay. (AES Pair 1 into
Embedded Group 1, ch1 & ch2, AES pair 2 into Embedded Group 2, ch3 & ch4). This control
overrides the standard audio routing system: if AES Pair 1 is selected, then the controls to route into
Embedded group 1, ch1 & ch2 don’t apply. There is no gain or polarity control available when this
option is selected.
Low latency AES Passthrough
This control is similar to zero delay audio embedding. If selected for input pair X it causes AES output
pair X to act as a bit for bit copy of AES input pair X. This over rides the normal audio routing and
delay. No gain and polarity adjustments are possible.