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Technical Specification
Instruction Manual: TT1260 Standard Definition Professional Receiver/Decoder Page B-5
ST.TM.E10100.1
Vertical Blanking Signals
The TT1260 range of Receivers and Decoders support the following VBI
reinsertion and signalling:
· VBI streams
· VPS data and pass through
· WSS data and pass through
· 525 VITC and 625 VITC
· Vertical Interval Test Signal (VITS)
· Video Index data
· AMOL pass through
· Closed Captioning (525-line sub-titling system)
· Insertion Test Signal (ITS) Insertion
B.2 Audio Decoding and Output Stage
B.2.1 General
The TT1260 is capable of simultaneously decoding two PES streams of
audio from the transport stream. Each of the Decoders is identical in
operation, but act completely independently of the other, with the
following exceptions:
· Both Decoders must be decoding channels that have the same
sampling rate
· Both Decoders are not required to simultaneously decode the same
PES stream
Each channel supports extraction of three types of coded audio from the
transport stream as follows:
· MPEG-2 Audio (Musicam): ISO/IEC 13818-3
· Dolby Digital AC-3 Audio: ATSC document A/52
· Linear Audio: SMPTE 302M – 2000 with system limitations as specified
in following section below
· The Receiver does not support MPEG-2 AAC Audio (ISO/IEC 13818-7)
at this release.
Audio component selection is specified from the User Interface or remote
interfaces. The TT1260 automatically detects the audio type of the selected
audio component and apply the appropriate decoding. Where there are
audio components in the selected service of the same language but
different coding types, the preferred component is linear audio, followed by
Dolby Digital AC-3, and followed by MPEG audio.
There is no requirement for specific selection behaviour where a service
contains two or more audio components of the same coding type and
language. The TT1260 is not required to support dynamic changes in the
audio coding type once the initial selection has been made. Provision is
made in the User Interface and remote interfaces for user override of
default audio selection by language and audio coding type, or by PID.
There is no support for static default languages.