Strata Operations Guide
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12 -
Audio Input – A
Used to select the following audio operational modes for MPEG encoder A input:
•
OFF
– Audio transport stream is not generated and enabled
•
Test Tone
– An internal 800 Hz test tone is enabled.
•
Analog Mono
– Two independent mono audio channels are enabled.
•
Analog Stereo
– Left and right audio channels are enabled.
•
SDI Embedded Mono
– Unit expects an embedded audio stream from an SDI video source.
•
SDI Embedded Stereo
– Unit expects an embedded audio stream from an SDI video source.
•
AES/EBU Mono
– Unit expects a digital audio input stream.
•
AES/EBU Stereo
– Unit expects a digital audio input stream.
Audio Input – B
Used to select the following audio operational modes for MPEG encoder B input:
•
OFF
– Audio transport stream is not generated and enabled
•
Test Tone
– An internal 800 Hz test tone is enabled.
•
Analog Mono
– Two independent mono audio channels are enabled.
•
Analog Stereo
– Left and right audio channels are enabled.
•
SDI Embedded Mono
– Unit expects an embedded audio stream from an SDI video source.
•
SDI Embedded Stereo
– Unit expects an embedded audio stream from an SDI video source.
•
AES/EBU Mono
– Unit expects a digital audio input stream.
•
AES/EBU Stereo
– Unit expects a digital audio input stream.
Audio Notes:
A) 48 KHz sampling is used for all audio (384 Kbits per stereo channel).
B) When using Alteia IRD with Audio A ON and Audio B OFF, Audio A is duplicated on Audio B
output XLR connectors.
C) When using Alteia IRD and 4 audio signals, the preferred language setting for Audio B must
differ from Audio A for decoding audio transport streams, e.g., set for Spanish.
Frequency Control Modes
The Strata TX system permits two different frequency control modes. The two frequency control modes
are:
Frequency-Locked-to-Presets
Frequency-Unlocked-to-Presets
Definition of Frequency-Locked-to-Presets mode
- In this mode, each preset is assigned an operating
frequency as channelized in a channel assignment table. The channel assignment table is normally
populated with the standard U.S. 2 GHz standard band plan channels, i.e., channels versus frequency, but
may have some or all channel assignments, e.g., c4, changed by the user to accommodate non-
standard frequencies (so long as they are in the specified band and a multiple of the frequency synthesizer
step frequency). Note that the user may modify the channel versus frequency table using the Strata TX
Configurator software utility. Hence in this mode of operation, selection of any one of 9 presets may, and
normally would, have an associated frequency (channel) locked to the selected preset.
