DP572 Dolby E Decoder

Dolby E Decoder DP572

The Dolby® E Decoder DP572 decodes Dolby E encoded program material for use in broadcast and postproduction facilities prior to final DTV and HDTV transmission.

The DP572 is designed to ease the transition by DTV broadcasters and program producers from two-channel to multichannel audio. The DP572 decodes up to eight channels of high-quality audio, plus Dolby Digital metadata, from a Dolby E signal encoded on a single AES3 pair, external fiber, satellite link, digital videotape, digital audiotape, or from a video server. It is easily integrated into postproduction and broadcast facilities. The DP572 can accept both PCM and Dolby E signals and can switch automatically to provide seamless integration of multichannel and archived stereo programming.

Dolby E Advantages

With Dolby E, coded audio frames match video frames, ensuring that audio-follow-video edits are free of mutes, glitches, or other aberrations. This makes it possible to switch, route, and perform edits directly on the digital bitstream without decoding and reencoding. Dolby E audio also carries Dolby Digital metadata generated by the program’s producers for final delivery to the home viewer’s Dolby Digital decoder.

In multichannel programming, a "5.1 + 2" Dolby E configuration is typically used, with six of the eight channels carrying a 5.1 program and the other two an Lt/Rt (matrix surround-encoded) or stereo two-channel program. Alternate channel configurations are available for multilingual or other specialized applications. Front-panel status LEDs and the LCD indicate the configuration of the Dolby E source signal.

In addition to inputs for Dolby E audio, a second input, PCM delay, has multiple functions. These include insertion of a voiceover into the decoded Dolby E program, insertion of local stereo audio without the need for additional equipment, or automation of switching between stereo and multichannel programming within a transmission chain. When using this input, the DP572 creates appropriate metadata to automate the rest of the Dolby broadcast audio chain.

The DP572 requires a standard video black reference signal, and can also be utilized in 24-frame applications when accompanied with the Dolby E Tri-Level Sync Interface DP579. Outputs are provided for SMPTE timecode.

DP572 Dolby E Decoder Front View Medium
DP572 Dolby E Decoder Rear View Medium
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Dolby E Decoder DP572: Front Panel

Display and Controls

Two-line, 16-character LCD with control keys for status indication and setup operations

Status LEDs

Indicate output channel activity, video reference, Dolby E program configuration, main input, PCM delay, input data (bit depth), fault, and error

RS-232 Serial Remote Port

8-pin female mini-DIN connector for remote control and software upgrades

Headphone Output

6.35 mm (1/4-inch) standard stereo headphone jack for confidence monitoring

Dolby E Decoder DP572: Rear Panel

Digital Audio Input

BNC female with loop-through, unbalanced, 75Ω, signal levels per AES-3ID-1995 (SMPTE 276M) specifications, external 75Ω termination required

Digital Audio Outputs

Two BNC female connectors for each output: 1/2, 3/4, 5/6, 7/8; unbalanced, 75Ω, signal levels per AES-3ID-1995 (SMPTE 276M)

Video Reference Input

BNC female with loop-through, unbalanced, NTSC program or black for 29.97 fps, PAL program or black for 25 fps; Dolby Black for 24 fps; 23.98, 24, 30 fps when using a DP579 Dolby E Tri-Level Sync Interface; signal levels per SMPTE 154, external 75Ω termination required

PCM In/Delay Out Port

Two BNC female, unbalanced, 75Ω, signal levels per AES-3ID-1995 (SMPTE 276M)

Linear Timecode Output Port

BNC female, unbalanced, per SMPTE 12M

RS-485 Serial Remote Input Port

9-pin female D-connector for software upgrades

Status Port

9-pin female D-connector, 0–5 V TTL levels

Auxiliary Output Port

9-pin female D-connector, RS-232, full duplex

Metadata Output Port

9-pin female D-connector; compatible with metadata inputs on DP569, DP570, or DP571

Audio Coding Algorithm

Dolby E

Dolby E Program Configurations

User-selectable: 5.1;  3 × 2;  5.1 + 1 + 1;  6 × 1;  5.1 + 2;  8 × 1;  4 × 2;  Others selectable

Audio Sampling Rate

48 kHz

Video Frame Rates

29.97 fps (NTSC)
25 fps (PAL)
23.98, 24, 30 fps (requires DP579 Dolby E Tri-Level Sync Interface)

Frequency Response

20 Hz to 20 kHz, ±0.25 dB

Distortion

<0.01% at 1 kHz
<0.02%, 20 Hz to 20 kHz

Dynamic Range

>110 dB

Delay

Encoding: fixed, one video frame PCM delay channel: fixed, one video frame PCM delay channel: fixed, one video frame or minimal delay

Power Requirements

90–264 VAC, 50–60 Hz, auto-sensing, 15 W maximum; designed to operate from a centrally switched power source

Dimensions and Weight

1-U rackmount: 44 × 483 × 324 mm (1.75 × 19 × 12.75 inches)
Net: 2.7 kg (5.9 lb)

Environmental Conditions

Operating: 0°C–50°C (32°F–122°F), natural convection cooling; 0%–98% relative humidity (noncondensing)
Nonoperating: −20°C to 70°C (−4°F to 158°F)

Regulatory Notices

North America: This unit complies with the limits for a Class A digital device pursuant to Part 15 of the FCC rules and Industry Canada ICES-003 Class A requirements. It is UL Listed for the US and Canada.
Europe: This unit complies with the requirements of Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC and carries the CE marking accordingly.



 
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