Dolby Laboratories DP572 Manual de inicio rápido

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DP571/DP572 Dolby E Professional Encoder/Decoder Quick Start Guide

Program Configuration

In the DP571 Encoder, the selection you make under the Program

Configuration menu determines how the audio channels are

grouped within the Dolby

E bitstream. Up to eight input channels

may be grouped together in "programs," where each program

contains its own metadata.

Examples:

5.1 + 2:

one six-channel and one stereo program (two individual

programs)

2×2:

two stereo programs (two individual programs)

2 + 6×1:

one stereo and six mono programs (seven individual

programs)

4 + 2 + 2×1:

one four-channel, one stereo, and two mono programs

(four individual programs)

Channel Activity Indications

Color

Indication

Off

Channel is disabled.

Yellow

Channel is enabled; level <–60 dBFS.

Green

Signal present above –60 dBFS.

Red

Signal above –0.1 dBFS (clipping).

Flashing Yellow

Required input missing.

Function LED Indications

Function

Color

Indication

Video

Green

Video reference is present and valid.

Ref

Yellow

Vref does not match Dolby E frame rate.

Red

Video reference is missing or invalid.

Fault

Off

Normal operation; system OK.

Off

Hardware-related fault.

Error

Off

No operational errors detected.

Red

Operational errors; output may be invalid.

PCM

Off

No PCM signal detected.

Dly In

Green

Valid PCM signal present at input.

Yellow

Non-48 kHz signal present. (DP572)

Video Reference (DP571 and

DP572)

The DP571 and DP572 both need a video reference: to align the

individual frames of data in the Dolby E bitstream and to generate

the output audio clock and align the metadata output, respectively.

In the DP571, you must manually configure the Frame Rate menu

to match the current video reference frame rate, whereas the

DP572 auto-detects the frame rate (see Function LED Indications).

To operate at 25 or 29.97 fps, a standard analog video reference is

required. To operate using a tri-level video reference at 23.98, 24,

or 30 fps, the DP571 and DP572 require the DP579 Tri-Level Sync

Interface.

Metadata (DP571 and DP572)

DP571:

The Dolby E output includes metadata, which may be set

internally through the front-panel menus or taken from an external

metadata stream connected to the rear panel.

DP572:

When decoding Dolby E, the metadata included in the

stream is sent to the rear-panel metadata port. When in Bypass or

Switched Out modes, metadata may also be sent to this port

(enabled via the Bypass Metadata menu) from an internal set of

parameters configured in the PCM Metadata menus. This allows

simple, local generation of metadata appropriate for the PCM audio

signal. The metadata is also used to control the transmission Dolby

Digital encoder and is often used to switch automatically between

5.1 and stereo programming or main and back-up feeds.

DP571 Operating Modes

Reversion Mode

These four selections determine what happens when external

metadata is lost.

• Stop Encoding: Encoding stops, output mutes, error LED lights.

• Last Used: Encoding continues using the last valid external metadata

values received.

• Preset: Missing metadata values are replaced using the internal

metadata values as selected in Metadata Params.

• Adaptive: If metadata is completely lost, the encoder uses the Last

Used method. If only some parameters are missing, the encoder uses

the Preset method.

Metadata Source

These two options determine the source of the metadata.

• Internal: Uses internal metadata values as selected in Metadata

Params.

• External: Metadata is supplied by the external source, and may not be

modified locally.

Dolby Digital Metadata

A home decoder uses Dolby Digital metadata to optimize the audio

program for the local listening environment. It controls replay level,

dynamic range, and downmixing. Dolby Digital metadata is also

used when monitoring in the station or during transmission to the

home.

• Enabled: Default setting; includes Dolby Digital metadata.

• Disabled: The Dolby E stream does not include Dolby Digital metadata;

useful only if the decoded bitstream will never be re-encoded as Dolby

Digital audio.

Bit Depth

This setting refers to the number of bits used in the digital audio

output to carry the Dolby E data stream. This should be configured

to match the bit depth available on the recording device or within

the facility. 20-bit allows for eight channels of audio and metadata,

16-bit for six channels of audio and metadata. This setting does not

refer to the number of bits of resolution of the audio signals carried

within the Dolby E stream.

DP572 Operating Modes

Program Play

• Enabled: Allows users to decode a Dolby E stream off a VTR in

Program Play mode, up to ±10% varispeed. The source VTR must

support varispeed without sample rate conversion.

• Disabled: Normal playback mode; Main Input is locked to video

reference at 48 kHz. Latency is locked at one frame; if Dolby E audio is

delayed by up to 10 msec with respect to video, the decode latency is

reduced to correct for the delay to maintain one-frame system latency.

PCM Bypass

• Enabled: PCM audio on the Main Input passes through the unit and is

sent to all outputs. Allows clean audio transitions when the Main Input

signal switches from Dolby E to PCM.

• Disabled: Audio outputs are muted when non-Dolby E stream is present

at the Main Input. This is the recommended setting for editing Dolby E

audio on a VTR.

Bypass Latency

• 1 Frame: Maintains a one-frame delay on a PCM signal present at the

Main In connector to match the Dolby E decoding delay. Only valid if

PCM Bypass mode is enabled.

• Minimal: The PCM Bypass delay is the minimum necessary (<8 ms)

from Main In to PCM Out.

www.dolby.com

Input/Output Channel Assignments

The program number (1–8) identifies the channels associated with

individual programs in this chart.

Program

Connector Channel Map

Config

1/2

3/4

5.1 + 2

1L/1R

1C/1LFE

1Ls/1Rs

5.1 + 2×1

1L/1R

1C/1LFE

1Ls/1Rs

4 + 4

1L/1R

1C/1S

1L/1R

1C/1S

4 + 2×2

4 + 2 + 2×1

1L/1R

1C/1S

3C/4C

1L/1R

1C/1S

4C/5C

4 + 4×1

4×2

1L/1R

3L/3R

1L/1R

3L/3R

4C/5C

3×2 + 2×1

2×2 + 4×1

1L/1R

3C/4C

5C/6C

1L/1R

4C/5C

6C/7C

2 + 6×1

8×1

1C/2C

3C/4C

5C/6C

1L/1R

1C/1LFE

1Ls/1Rs

5.1

4 + 2

1L/1R

1C/1S

1L/1R

1C/1S

4 + 2×1

3×2

1L/1R

3L/3R

1L/1R

3C/4C

2×2 + 2×1

2 + 4×1

1L/1R

4C/5C

1C/2C

3C/4C

5C/6C

6×1

1L/1R

1C/1S

1L/1R

None

2 + 2

2 + 2×1

1L/1R

None

1C/2C

3C/4C

4×1

7.1

1L/1R

1C/1LFE

1Ls/1Rs

1L/1R

1C/1LFE

1Ls/1Rs

7.1 Screen

PCM Bypass

1L/1R

DP572 Decoding and PCM Bypass

Normal Dolby E Decoding:

DOLBY E INTO MAIN INPUT

PCM INTO PCM CHANNEL INPUT

Lt/Rt AES

PCM only

PCM DELAY

1/2 (PCM)

Dolby E

3/4

L,R,C,LFE,LS,RS,

MAIN

SAP,SAP

DOLBY E

DECODER

DP572

REF

METADATA

Main Input Carries PCM:

PCM BYPASS ENABLED

PCM INTO MAIN INPUT

PCM INTO PCM CHANNEL INPUT

Lt/Rt AES

PCM only

PCM DELAY

1/2 (PCM)

PCM

MAIN

3/4

SAP,SAP

MAIN

DOLBY E

DECODER

DP572

REF

METADATA

DP572 Output Routing Modes

The DP572 Dolby E Decoder offers five routing modes to assist

with integration into existing digital audio paths. All five modes can

be selected from the PCM Ch Config menu; Voiceover and

5/6

7/8

Switched Out modes can also be selected through the rear-panel

2L/2R

Status Port.

2C/3C

Voiceover Mode:

Mixes the PCM signal present at the PCM In

2L/2R

2C/2S

connector with the audio in Program 1 of the Dolby E stream.

3L/3R

2L/2R

The attenuation of the decoded Dolby E content can be

2L/2R

adjusted using the Voiceover Attn menu, and the incoming

2C/3C

PCM voiceover signal can be routed to either the Center or

4L/4R

2L/2R

Left and Right channels by selecting either Mono or Stereo

2L/2R

from the Voiceover Ch menu.

2L/2R

2C/3C

Switched Out Mode:

Replaces Program 1 of the decoded Dolby E

7C/8C

audio with the signal present at the PCM In connector. Audio

None

present at the PCM Input connector is routed to output

None

2L/2R

channels 1 and 2, while all other outputs relevant to Program 1

None

2C/3C

are muted.

None

2L/2R

Auto Switched Out Mode:

Provides an automatic, smooth

None

2L/2R

transition between material decoded with Dolby E technology

None

2C/3C

and a "Switched Out" condition when the Main Input to the

None

DP572 switches from Dolby E to PCM.

None

Delay Out Mode:

Allows a two-channel PCM signal present at the

None

2L/2R

PCM In connector to stay in sync with the decoding latency of

None

2C/3C

None

the Dolby E audio. In this mode, the PCM Delay Output

1Bsl/1Bsr

connector is active. You can optionally place an internal sample

1Le/1Re

rate converter in the path of the PCM Input signal.

1L/1R

External Ctrl:

Instructs the DP572 to look for routing commands

from the rear-panel Status Port.

Tip:

The Switched Out mode menu controls the DP572 audio and

metadata outputs if the Main Input signal disappears and the

unit is set to Switched Out (or Auto Switched Out) mode. If set

to Mute, both audio and metadata outputs are silent; if set to

Active, Switched Out mode operates normally.

Lt/Rt AES

1/2 (PCM)

DP572 Switched Out Mode

LFE

UNIT IN SWITCHED OUT MODE

DOLBY E STREAM INTO MAIN INPUT

SAP

PCM INTO PCM CHANNEL INPUT

SAP

PCM DELAY

PCM only

Lt/Rt AES

1/2 (PCM)

DOLBY E

3/4

L,R,C,LFE,LS,RS,

MAIN

Lt/Rt AES

SAP,SAP

1/2 (PCM)

PCM MAIN 3

DOLBY E

PCM MAIN 4

DECODER

REF

DP 572

PCM MAIN 3

PCM MAIN 4

PCM MAIN 3

METADATA

PCM MAIN 4

PCM MAIN 3

PCM MAIN 4

Dolby and the double-D symbol are registered trademarks of Dolby Laboratories.

All other trademarks remain the property of their respective owners.

MUTE

PCM Lt

Only

PCM Rt

"Program 1"

MUTE

in Dolby E

MUTE

stream is

MUTE

"switched"

MUTE

or first two

SAP

channels if

SAP

the main

input is PCM.

2/0