3 dolby e encoder, 1 input and output channel selection, 2 configuration – Grass Valley AMX-3981 2014 User Manual
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GUIDE TO INSTALLATION AND OPERATION
76 | AMX-3981
6.3 Dolby E encoder
• Identified as MOD-DOLBY-ENC-E on the Module tab
6.3.1 Input and Output channel selection
Shuffler Inputs
An input shuffler allows any combination of the available
channels to be used as inputs. Default is CH1 to CH8.
• Pulldowns: Available input channels 1 to 32
Output Channels
Use the pulldown to select the pair of channels on which the
encoded output will be placed.
[1-2, 9-10, 17-18, 25-26]
6.3.2 Configuration
Encoding Mode
The operational mode can be Dolby E Encode or Pass-
through.
Test signals at -18, -20 dBFS and silence are available for
each mode.
• Encode test modes will generate a test bit-stream
containing a 1 kHz sine wave for full bandwidth
channels and 100 Hz for the LFE channel of a 5.1
program.
• In Pass-through test modes, it will generate a 1 kHz
PCM sine wave at its outputs.
When the encoding mode changes, the output mutes and resumes in the selected mode within one second.
In both encoding and pass-through mode, the delay through the encoder is always one video frame.
Bit Depth
This parameter specifies the number of bits per word used in the Dolby E bitstream. When using an output data width
of 16 bits, the available program configuration will be limited to those which require a maximum total of 6 channels.
48 kHz Pull-down
When Pull-down mode is enabled the encoder will output the Dolby E bitstream at a sample rate of (1000/1001) * 48
kHz.
Metadata Source
Metadata is the only option. Refer to the Dolby Metadata panel (section 5.8) for information and configuration.
Reversion Mode
This parameter specifies the module’s behavior when its selected Metadata Source is lost or corrupted.
[Use last valid Metadata, Stop Encoding]
Note: With version 1.1.2.0 of the Dolby E encoder, the Reversion Mode is forced to Use last valid Metadata due
to a limitation in the module itself. The Stop Encoding mode will be available in future versions of the encoder.
Figure 6.6 Audio Modules - Dolby E encoder