GUIDE TO INSTALLATION AND OPERATION
72
| FRS-3901
6.3 Dolby E encoder
•
Identified as MOD-DOLBY-ENC-E on the Module tab
6.3.1 Input 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
This encoder places the output on channels 17 and 18
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.
Encoding Latency
The Dolby E encoding latency is one (1) video frame (33 msec for 59.94 Hz formats and 40 msec for 50 Hz formats).
The encoding latency is automatically compensated (to avoid lip-sync issues) when the video additional frame delay
(
Timing
tab) is set to at least one (1) frame.
Figure 6-6 Audio Modules - Dolby E encoder
