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Introduction to the Basic Encoder
Instruction Manual: evolution 5000 E57xx DSNG and DENG Voyager Encoder Page 1-11
ST.TM.E10076.3
Audio Inputs
The standard audio input is:
· AUDIO IN – 15-way male D-type - software selectable balanced
analogue or digital AES/EBU, with AES/EBU on left only. A break-out
cable is supplied which plugs into this connector and provides a more
convenient means of connecting the audio inputs via five connectors.
There are four XLR female connectors, with the fifth cable being a BNC
which provides an AES/EBU 75 W digital reference output.
· Alternatively, audio can be input embedded as AES/EBU on the serial
digital interface (SDI). In this mode a maximum of four stereo pairs
can be extracted from any two Data Identifiers (DIDs). Audio may be
converted to either of the standard output sampling frequencies,
32 kHz or 48 kHz, by use of the built-in asynchronous sample rate
converters. This applies only to audio which is not pre-encoded.
Audio Channels
The Encoder Base Board is capable of processing two stereo pairs, from
any of the following
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:
· SDI Embedded source
· Digital source AES/EBU
· Analogue source, termination impedance 600 W or 20 kW
These signals may be processed using the encoding modes in the following
section.
MPEG Encoding Modes
The two stereo pairs may be configured in various encoding modes:
· Single mono: the left channel is encoded - the signal is output to both
XLR connectors at the receiving end. Not available in Linear PCM.
· Dual mono: the left and right signals are encoded and carried in the
transport stream as a single Packetised Elementary Stream (PES) data
stream. The way that the left and right signals are output from the
Receiver is dependent on how the routing is set up on the Receiver.
Both the left and the right may be output, or the left only, or the right
only. This is typically used for multilingual services. Available in
MPEG-1 (layer 2) and Linear PCM.
· Stereo: A stereo pair is coded as two mono signals - the two signals
are output as stereo at the receiving end.
· Joint stereo: A stereo pair is coded taking advantage of the stereo
nature of the channels - the two signals are output as stereo at the
receiving end. Available in MPEG-1 (layer 2) only.
· Audio Description Service
Dolby Digital (AC-3) Encoding Modes
· 1/0: centre
· 2/0: left and right
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See Annex G, Audio Modes for details of setting up the audio.