Digital Audio; Embedded Audio; Audio Routing; Lip Sync - TANDBERG TT1260 Reference Manual

Table B.5: Analogue Audio Performance Specifications
Parameter
Gain
Frequency response
Cross talk
Distortion
Noise
Phase
Lip sync delay
B.3.3

Digital Audio

Maximum data rate: 3.072 Mbit/s.
•
EBU Tech. 3250 Specification of the digital audio interface (the AES/EBU interface), 2nd
Edition 1992
•
AES Recommended Practice for Digital Audio Engineering – Serial transmission format
for two-channel linearly represented digital audio data (Revision of AES3-1985, ANSI
S4.40-1985)[1999-02-10 printing]
•
ANSI S4.40 – 1992 Recommended Practice for Digital Audio Engineering – Serial
Transmission Format for Two-Channel Linearly Represented Digital Audio Data (AES 3)
B.3.4

Embedded Audio

Either or both of the stereo pairs selected for decoding by the Receiver can be routed out via
the SDI video output, as AES/EBU digital audio embedded in the Ancillary Data Space, as
defined in SMPTE 272M-1994. The operational level of this standard supported is SMPTE
272M –A
(20-bit synchronous audio at sampling rates of 48 kHz).
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.
Reference Guide: TT1260 Contribution Receiver
ST.RE.E10100.3
Conditions
0 dBm input level
100 Hz - 15 kHz, 0 dBm input level
20 Hz - 20 kHz, 0 dBm input level
0 dB input level, 100 Hz
0 dB input level, 1 kHz
0 dB input level, 10 kHz
+8 dBm input level, 100 Hz
+8 dBm input level, 6.3 kHz
RMS
40 Hz to 15 kHz
Depends on synchroniser configuration
Technical Specification
Limit
±1 dB
±0.2 dB
+0.5 dB, -1 dB
-80 dB
-70 dB
-60 dB
-70 dB
-70 dB
-65 dB
±2°
±5 ms
Page B-7