AJA FS2 - Manual (Page 81)

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81 FS2 Installation and Operation Manual — SYSTEM Menu Group
14.0 AES/EBU
SRC Mode This parameter controls the mode of the audio sample rate converters for AES/EBU
input audio pairs.
In Manual mode, the sample rate converters are enabled manually for each AES pair
using parameters 14.1 through 14.8.
In Auto mode, the system decides how to handle sample rate conversion. Normal
PCM audio passes through the Sample Rate Converters and gets converted, as
appropriate. AES channels in which the non-audio flag is set in the Channel Status
Word are automatically detected and allowed to bypass the Sample Rate Converters;
the signal passes unaltered and the existing data is preserved.
14.1–14.8 AES/
EBU SRC This group of parameters controls audio sample rate conversion on AES/EBU input
audio channel pairs 1/2, 3/4, 5/6, 7/8, 9/10, 11/12, 13/14, and 15/16.
When 14.0 AES/EBU SRC Mode is set to Auto, no settings per channel are required;
sample rate conversion occurs normally for all channels unless the non-audio flag is
set in the Channel Status Word, in which case sample rate conversion gets bypassed
and the signal is passed through unaltered.
When 14.0 AES/EBU SRC Mode is set to Manual, each channel pair can be set manually
to On or Bypass. using parameters 14.1–14.8.
On is the default setting in which audio is rate-converted and synced with video (SRC
is applied).
Bypass is available for use when Dolby ® 5.1 and similar schemes need to be preserved
and the audio data passed unaltered (no SRC is applied).
Set these parameters to Manual (14.0)and Bypass (14.1-14.8) only if the following are
both true:
1. You want to pass unaltered digital encoded audio from either an embedded or AES
Input to an embedded and/or AES Output.
14.0 AES/EBU SRC Mode Selections Selection Descriptions
Auto (default)
Manual
The signal bypasses the Sample Rate Converters for audio channels
containing a non-audio flag in the Channel Status Word. If the non-
audio flag is not set, the signal passes normally through the
Sample Rate Converters.
The FS2 determines what to do about audio sample rate conversion
on a channel pair-by-pair basis, determined by settings 14.1-14.8.
If a channel pair is set to On, sample rate conversion is applied to
that channel pair. If a channel pair is set to Bypass, the FS2 leaves
embedded audio as is, bypassing sample rate conversion; this is
useful for Dolby
®
5.1 embedded audio and other applications
where you do not want sample rate conversion to occur.