Audio Routing; Lip Sync; Supported Audio Specifications; Supported Audio Bit-Rates - TANDBERG TT1260 Reference Manual

Technical Specification
B.3.5

Audio Routing

The IRD supports the following routing of audio signal:
·
STEREO (Channel 1 left, Channel 2 right)
·
MIXED TO BOTH (Channel 1 and 2 on left and right)
·
LEFT TO BOTH (Channel 1 on left and right)
·
RIGHT TO BOTH (Channel 2 on left and right)
When the input signal is STEREO, the Audio digital output format will
always be STEREO.
Where a dual mono service is available, it is possible to configure the
output as MIXED TO BOTH, LEFT TO BOTH and RIGHT TO BOTH.
B.3.6

Lip Sync

The audio at the output remains synchronous to the decoded video by
default (i.e. where both video and audio streams are available from the
same service). In such circumstances the video and audio streams share
the same PCR.
The lip sync error (delay from presentation of video until presentation of
audio) introduced by the Receiver is in the range of ±5 ms.
The lip sync delay between stereo pair 1 and 2 is ±2 ms because the PTS
will be presented independently for each pair.
When using frame sync the lip sync error is up to 40 ms due to audio
frame skip and repeats.
B.3.7

Supported Audio Specifications

Table B.6: Supported Audio Specifications
Specification
ISO/IEC 13818-3
ATSC A-52
SMPTE 302M
B.3.8

Supported Audio Bit-rates

Table B.7: Supported Audio Data Bit-rates (MPEG-2)
Mono kbit/s
32
48
56
64
80
Page B-8
Description
Generic Coding of Moving Pictures and Associated Information: (MPEG-2) Audio.
Digital Audio Compression Standard (Dolby Digital).
Linear Audio (TANDBERG Television's interpretation of the specification).
Stereo kbit/s Mono kbit/s
64 96
96 112
112 128
128 160
160 192
Stereo kbit/s
192
224
256
320
384
Reference Guide: TT1260 Contribution Receiver
ST.RE.E10100.1