Cobalt Digital COMPASS 9301 AES Audio Delay - Manual (Page 39)

9301-OM (V4.2) 9301 PRODUCT MANUAL 3-9
Operating Instructions
9301 Function Submenu List and Descriptions
Table 3-1 9301 Function Submenu List
Controls the AES Audio Input features for the eight AES
pairs.
• SRC Enable/Bypass Individual SRC Enable/Disable control for each AES pair (1 thru 8)
enables or disables Sample Rate Conversion (SRC) as follows:
• Enabled: In this mode, SRC for the corresponding AES input pair is
enabled. This allows the 9301 to interface with asynchronous AES
sources. SRC can be used to compensate for minor clock rate
differences in the AES stream and the video reference stream. SRC is
set to Enabled by default.
• Disabled: In this mode, SRC for the corresponding AES pair is
bypassed. This mode may be preferred where the AES rate matches
the reference input rate. This mode is necessary when embedding
non-PCM AES audio such a Dolby
® E or Dolby Digital™ audio streams.
Note: In this mode AES rate must match the reference input rate or
audio dropouts will occur. SRC is set to Disabled (bypass
turned on) by default.
Note: AES audio must be nominally 48 kHz.
Audio Input Controls
• AES Passthrough Individual Passthrough On/Off control for each AES pair (1 thru 8)
enables passthrough as follows:
• Off: Disables Passthrough for the selected AES input pair.
• On: Passthrough is turned on, with the corresponding AES output pair
to act as a bit-for-bit copy with zero delay of the corresponding AES
input pair.
Note: Passthrough set to On overrides the normal audio routing and
delay. Gain and polarity control is not available when
passthrough is enabled. This control is set to Off by default.
• Status Displays Individual signal status displays for AES pairs 1-8 as follows:
• Not Present: Indicates AES pair does not contain recognized audio
PCM data.
Note: Channel displaying Not Present may still carry usable audio
data with Not Present being displayed due to invalid
headers.
• Present, Professional: Indicates AES pair contains recognized
AES audio PCM data.
• Present, Consumer: Indicates AES pair contains audio PCM data
other than AES (for example, S/PDIF).
• Present, Dolby E: Indicates AES pair contains Dolby ® E encoded
data.
• Present, Dolby Digital: Indicates AES pair contains Dolby ® Digital
encoded data.
Note: Dolby status displays shown to the left only occur for valid
Dolby ® signals meeting SMPTE 337M standard.
The 9301 card does not perform Dolby
®
processing on the
signal. Although the 9301 controls will appear to be usable
for this signal tag, the signal is passed with 1-to-1 routing
and all related gain and polarity controls set to unity.
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