Dolby Laboratories DP524 Manual de usuario descargar pdf (Pagina 13)

DP571 Dolby

E Encoder User’s Manual Hardware Installation

the DP570, to the DP571 encoder which adds this audio metadata to the 5.1 audio to

make the Dolby E data stream which is then encoded into the outgoing MPEG

Transport Stream. The DP572 decoder is used for confidence monitoring.

Mixing

Console

5.1-Channel

Monitor

System

DP571

DP570

DP563

Metadata from

DP570toDP571

Lt/Rt

Main

Lt/Rt

MPEG

Encoder

Dolby E

DP572

Dolby E

(5.1)

Figure 1-2 Live Remote Telecast Configuration

1.7 Digital Television Distribution

Dolby E encoding is commonly used to distribute multichannel audio from a network

center to multiple affiliate stations, usually via satellite or fibre. Figure 1-3 illustrates

a typical setup for this application, where master control requirements dictate that

audio switching occurs discretely, and that the audio must be encoded into a Dolby E

signal prior to transmission.

Figure 1-3, the source audio is a Dolby E stream, either played out from a VTR or

server, or received live through an IRD. In most situations, a separate Lt/Rt audio

signal will also be present. Both the Dolby E and Lt/Rt streams are processed by the

DP572, providing discrete signals to the master control switcher inputs. The switcher

output is sent to the DP571 for Dolby E encoding, and also to the DP570 for

monitoring and metadata modification (if required). Note that, in this example, the

metadata outputs from both DP572 decoders are passed through the master control

switcher via a serial layer (this is only one possible method). The “air” and

“preview” serial outputs of the master control switcher are connected to the DP571

and the DP570 respectively. More than two metadata streams can be switched if

necessary. The DP571 output then gets multiplexed with video in the MPEG transport

stream and sent for distribution.

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Dolby Laboratories DP524 Manual de usuario Pagina 13

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