Ericsson RX1290 Betriebsanweisung Seite 98

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Technical Specification
Page B-6 Reference Guide: RX1290 H.264 Contribution Receiver
ST.RE.E10228.1
B.1.5 HD SDI
HD SDI output supports:
Embedded Decoded Audios
Closed Captioning (EIA 708B)
VITC
VANC
B.2 Audio Decoding and Output Stage
B.2.1 General
The Contribution Receiver is capable of simultaneously decoding four PES streams of
audio from the transport stream. Each of the decoders is identical in operation, but act
completely independently of the other.
Each channel supports extraction of four types of coded audio from the Transport Stream as
follows:
MPEG-1, Layer 2 Audio (Musicam): ISO/IEC 13818-3
Dolby Digital AC-3 Audio: ATSC document A/52
Linear Audio: SMPTE 302M – 2000
DTS Audio pass-through
AAC
HE-AAC
Dolby E pass-through
Audio component selection is automatic or may be specified from the User Interface or remote
interfaces. The Contribution Receiver automatically detects the audio type of the selected
audio component and applies the appropriate algorithm. Audio component selection is based
on the position of the component descriptor in the PMT. Audio 1 takes the first component,
Audio 2 the second, Audio 3 the third and Audio 4 the fourth. These may be overridden by
selecting User-specified component PIDs.
B.2.2 MPEG Audio
The Contribution Receiver supports decoding of MPEG audio as follows:
Compression layers: MPEG-1 layers I and II
Sampling rate (kHz): 48
Maximum compressed data rate: 384 kbit/s (layer II)
B.2.3 Dolby Digital AC-3 Audio
The Contribution Receiver is able to decode and output the primary stereo pair of a Dolby
Digital AC-3 encoded audio stream. When there is data encoded on the audio surround
channels, the Decoder applies down mixing, so that either a surround encoded stereo pair
(LtRt down mix) or a conventional stereo pair (LoRo down mix) is available at the output.
The Contribution Receiver is not able to decode and output all 5.1 channels individually as
separate channels.
It is possible to output the compressed Dolby Digital stream from the digital audio output,
allowing it to be decoded to 5.1 channels by an external Decoder.
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