TANDBERG E5500, Инструкция по эксплуатации

Страница: 18 / 256

Introduction
Page 1-10 Instruction Manual: evolution 5000 E5500 Mobile Contribution Encoder
ST.TM.E10033.3
•
Pre-compressed (or pre-encoded – IEC 61937) audio in pass-through
mode is also available (it only operates at 48 kHz). This is where an
audio stream has already been encoded externally, prior to entering
the Encoder, and passes through to the output. This type of audio is
supported in Dolby Digital.
NOTE…
Motherboard software prior to ver 3.3 included Dolby Digital (AC-3) as part of the standard product.
A separate licence is required from software ver 3.3, this is available from TANDBERG Television.
The input for this type of audio is either via the Serial Digital Input of
the audio connector or it can be embedded with the incoming video.
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. The right
channel can be configured to output a reference AES/EBU signal for an
external Dolby AC-3 Encoder. The audio connector is a 15-way male D-
type, but a break out cable is supplied which plugs into this connector
and provides a more convenient means of connecting the audio inputs
via four XLR female connectors.
•
Alternatively, audio can be input embedded as AES/EBU on the serial
digital input (SDI). In this mode a maximum of four stereo pairs can
be extracted. Audio may be converted to either of the standard output
frequencies, 32 kHz or 48 kHz, by use of the built-in asynchronous
sample rate converters.
Audio Channels
The MCE supports four channels of audio, which may be configured as:
•
Four analogue single mono channels, 600 Ω or 20 k Ω
•
Two analogue stereo pairs, 600 Ω or 20 k Ω
•
Two digital channels, AES/EBU or embedded SDI.
MPEG Encoding Modes
The two stereo pairs may be configured in various MPEG-2 encoding
modes:
•
Single mono: a mono signal is encoded on the left channel only
•
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
•
Stereo: A stereo pair is coded as two mono signals - the two signals
are output as stereo at the receiving end
•
Joint/intensity 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.