6. APPLICATION NOTES
operation manual b40, chapter 6-Application notes- page 6-1
APPLICATION NOTES
6.1
B40 SERIES WITH
SDI-INTERFACE
6
In digital video recording technology four digital audio channels
are the standard configuration. This channel capacity is used
increasingly in production and post-production for surround
sound, providing mix options and for multi-lingual productions.
Quite often it is necessary to make corrections or changes to the
audio which until now required the use of an expensive digital
audio mixer. These tasks can now be easily solved with the
Jünger Audio range of digital audio toolboxes. Simple
processing for up to four digital audio signals may be carried out
quickly and efficiently.
Using the SDI versions (SDI=Serial Digital Interface, digital
component video format with 270Mb/s transmission) b40 series
can process embedded audio.
The standard allows up to four groups each of four mono audio
channels. Usually used by most of D-VTR's and other equipment
is Group 1 with 48 kHz synchronous sampling. Synchronous
means that the audio clock is genlocked to the associated video.
Each channel can have up to 20 bits of resolution per audio
sample.
The 4-channel processors of b40 series fitted with SDI-interface
are compatibel with the standard SMPTE 272M-AB. They
support 48 kHz synchronous audio sampling with 20 bit word
length.
The Jünger Audio SDI interface provides for one group of four
audio channels to be extracted from or inserted into the SDI data
stream. To address a specific channel group the group selection
is possible (see 2.5).
For the basic working mode the input of the digital audio
processing can be selected between AES/EBU or SDI (serial
digital video with embedded audio). The processed signals are
present at both outputs always - at AES/EBU and SDI.
There are two additionaly working modes using the SDI interface.
SDI Bypass is bypassing the SDI data stream. In this case only
extracted audio is processed and available at AES output. In Split
Mode the audio path is splitted. Embedded audio can be
processed with external equipment via AES interface.
6.2
BASIC WORKING
MODES WITH SDI
Following illustration shows working modes: