User manual

Dolby Audio Management
Concepts
• Dolby Digital or Dolby 5.1 or AC-3, is an audio coding system containing up to 6
discrete channels of sound, with 5 channels for normal-range speakers (20 Hz -
20,000 Hz) (Right front, Center, Left Front, Right Rear and Left Rear) and one channel
(20 Hz - 120 Hz) for the LFE, or subwoofer.
• Dolby E is a professional coding system optimized for the distribution of surround and
multichannel audio through two-channel postproduction and broadcasting
infrastructures, or for recording surround audio on two audio tracks of conventional
digital video tapes, video servers, communication links, switchers, and routers.
Available Dolby Configurations
Case 1: The 5.1 audio signal is carried on 6 discrete PCM audio
channels
• It is available on an XS server in all configurations.
• The audio can be analog, digital or embedded depending on the configuration.
• In AES audio, if the audio is correctly genlocked to the video, the sample rate
converter can be switched off.
Case 2: The 5.1 audio signal is coded in the two-channel Dolby E
standard
• Dolby E over AES/EBU links
◦ Set the configuration of the pair of channels carrying the Dolby E signal to “DY” in
the Multicam Configuration window, Channels tab. This has two effects:
• It disables the sample rate converter on the input channels.
• It forces all transitions to a hard cut.
If the sample rate converter is activated and the audio configuration is a mix between
PCM audio over AES and Dolby E over AES, the sample rate converter will only be
applied to the PCM over AES signal.
• Dolby E Embedded in the SDI/HD SDI stream
◦ Set the configuration of the pair of channels carrying the Dolby E signal to “EY” in
the Multicam Configuration window, Channels tab. This will force the transition to
a hard cut.
◦ The sample rate converter parameter does not apply to embedded audio.
116 3. Multicam Configuration
EVS Broadcast Equipment S.A. Issue 11.02.A July 2013