Ross softGear, User Manual

Page: 45 / 70

BAP User Guide (v1.0) Configuring the Dolby Encoders • 45
Configuring the Dolby Encoders
This chapter outlines the steps required to configure the Dolby® encoder channel for an SDI
output.
Enabling a Dolby Encoder Channel for an SDI Output
The first step in setting up an encoder is selecting the Encoder Format.
To enable an encoder channel for an SDI Output
1. Display the DD DDP Encoder interface as outlined in “ To display the BAP interfaces in
DashBoard ”.
2. Select the Config tab.
3. Verify that the Bypass box is cleared (unselected).

If the Bypass box is selected, the Dolby encoder is bypassed and the output is PCM data.

Changing the Bypass box state will create a video and audio glitch.
4. Use the Encoder Mode menu to specify the type of Dolby encoding for the output audio
channel.

Changing the Encoder Mode will create a video and audio glitch.

The Audio Coding Mode read-only field reports the active channels within the encoded
bitstream. Paths 1 and 3 are fixed to 3/2 (L R C LFE Ls Rs). Paths 2 and 4 are fixed to 2/0 (L R).
5. Use the Data Rate menu to specify the maximum data rate allowed for the output audio
channel.

A Data Rate of 192kbps is recommended for watermark encoding.
6. Select the LFE box if a Low-Frequency Effects (LFE) channel is present in the encoder data or if
the Audio Coding Mode is set to 3/2 .

Clear the LFE box if an LFE channel is not present in the encoder data or if the Audio Coding
Mode is set to 2/0.
Specifying the Bitstream
The section outlines how to enable the BAP to indicate the bitstream properties of the audio. This
information is used by downstream Dolby® devices to decode the data.
To configure the bitstream properties of the encoder channel
1. Select the Bitstream Info tab.
2. Use the Dolby Surround Mode menu to indicate whether the 2-channel bitstream includes
Dolby Surround (Lt/Rt) data.
3. Use the Dolby Digital Surround EX Mode menu to specify whether the audio data is encoded
using Dolby Digital Surround EX.
Preprocessing
This section outlines how to select a standard operational mode for the encoder channel. The
operational mode automatically configures the decoder to implement the dialogue normalization,
DRC, and downmixing settings.